bluuebunny/crossref_metadata_2025 huggingface dataset:
THE RADIOLYSIS OF HCl–HBr MIXTURES
Authors: Rumfeldt R. C. , Armstrong D. A.
Published: May 2006

Bromine was the only halogen formed in irradiated mixtures of HCl and HBr. A study of its effect on the hydrogen yield from HCl showed that it reacted with the first hydrogen-forming species (or its precursor), and indicated the same yield for this species as did the earlier experiments with chlorine. The results were consistent with thermal hydrogen atoms, formed in the reaction[Formula: see text]as the first hydrogen-forming species, and hot hydrogen atoms, resulting from the dissociation of excited HCl molecules, as the second species.The hydrogen yield from liquid HBr at −79°C was a factor of two larger than that from liquid HCl at the same temperature, and in mixtures of the two the hydrogen yield increased gradually from a value characteristic of pure HCl [Formula: see text] to one characteristic of pure HBr [Formula: see text] The smaller yield from HCl cannot be explained by radical combinations:[Formula: see text]

[Formula: see text]in the radiation tracks and must be attributed either to differences in the ion-combination reactions in the two liquids or to a genuinely greater yield of ions and/or dissociative excited molecules in HBr. The hydrogen yield from solid HBr at −196 °C was [Formula: see text].
THE INFRARED SPECTRA OF TRIMETHYLAMINE OXIDE SALTS
Authors: Cook Denys
Published: May 2006

Several salts of trimethylamine oxide have been prepared. A species common to all these salts, the (CH3)3NOH+ ion, has been inferred from the infrared spectra of the solids, but with varying degrees of interaction in the hydrogen bond [Formula: see text] depending on the anion. These variations have been investigated in detail, and with the help of deuterium replacement, confident assignments for the OH stretching, bending, and torsional modes have been made. A splitting of about 80 cm−1 in the bending mode has been noted, and has been ascribed to correlation field coupling. With one exception, the assignments are in good agreement with those previously determined by Giguère and Chin.
THE INFRARED ABSORPTION OF SOME CRYSTALLINE INORGANIC FORMATES
Authors: Harvey K. B. , Morrow B. A. , Shurvell H. F.
Published: May 2006

The infrared absorption of some polycrystalline alkali metal and alkaline earth formates has been measured in the region of 500 cm−1 to 3000 cm−1. The observed crystal splitting of the formate fundamentals is discussed in terms of a vibrational analysis under the factor group.
THE METHYL 2-O- (BENZYLTHIO)CARBONYL DERIVATIVE AS A PRECURSOR TO PARTIAL ESTERS OF METHYL α-D-GLUCOPYRANOSIDE
Authors: Willard J. J. , Sadowski Joanne , Vitale William
Published: May 2006

The utility of the thiocarbonyl group for blocking the C2 hydroxyl in methyl glucosides has been demonstrated. Methyl 2-O-(benzylthio)carbonyl-α-D-glucopyranoside has been synthesized in good yield and its structure proved. Use of this 2-O-thiocarbonyl derivative in conjunction with acid-labile blocking groups has permitted the first syntheses of the following esters of methyl α-D-glucopyranoside: 3-O-benzoyl-, 3,4-di-O-benzoyl-, and 3,4,6-tri-O-benzoyl-, and the crystalline 2-O-(p-toluene)sulphonate derivative of each.
ORGANIC PEROXIDES V: OXIDATION OF ARYLLITHIUM COMPOUNDS TO PHENOLS
Authors: Chang H. S. , Edward J. T.
Published: May 2006

not available
THE EFFECT OF SUBSTITUENTS ON THE STABILITIES OF COMPLEXES OF PLATINUM WITH ARYL ACETYLENES AND PHOSPHINES
Authors: Allen A. D. , Cook C. D.
Published: May 2006

Compounds of platinum (0) with aryl phosphines are stabilized by electron-withdrawing substituants. A maximum coordination number of three is observed in such cases, suggesting that platinum tetracarbonyl cannot be prepared. Compounds in which one phosphine is replaced by an aryl acetylene are also stabilized by electron withdrawal by the acetylene and quantitative data are given on the relative stabilities of these compounds. These data indicate that a two-coordinated diphosphine platinum (0) compound might be stable if an appropriate substituted phosphine is used. The effect of substituents on the stabilities of these compounds is discussed.
ORGANOTIN CHEMISTRY: II. THE REACTION OF DIORGANOTIN OXIDES WITH PHENOLS
Authors: Considine Wm. J. , Ventura J. J. , Gibbons Jr. A. J. , Ross A.
Published: May 2006

The reaction of diorganotin oxides with many compounds containing active hydrogen proceeds to the formation of di-derivatives. With phenols the reaction stops at the distannoxane stage. The synthesis and characterization of several 1,3-diphenoxydistannoxanes is described. On the basis of molecular weights and other evidence, a structure is proposed for these compounds.
ORGANOGERMANIUM COMPOUNDS: PART II. INFRARED SPECTRA OF SOME ACOXYGERMANES AND THE RELATIVE INDUCTIVE EFFECTS OF TRIMETHYLSILYL AND TRIMETHYLGERMYL GROUPS
Authors: Srivastava T. N. , Onyszchuk M.
Published: May 2006

The infrared spectra of GeH3OCOCH3 and (CH3)3GeOCOCH3 have been measured in the gas phase over the range 650–3900 cm−1. Assignments for the principal bands have been made and their values compared with those of analogous alkyl, methylsilyl, methyltin, and methyllead acetates. Carbonyl absorption bands shift to lower frequencies and carbon–oxygen (skeletal) absorptions to higher frequencies as M changes from C to Si to Ge in the series of acetates represented by (CH3)3MOCOCH3. These results suggest that the Ge—O bond is more polar than the Si—O bond and that the order of electron release in acetate derivatives is (CH3)3Ge > (CH3)3Si > (CH3)3C, which is consistent with the electronegativity order: C > Si > Ge.
RECENT DEVELOPMENTS IN THE ORGANOMETALLIC CHEMISTRY OF TECHNETIUM. PREPARATION AND PROPERTIES OF A POLYNUCLEAR TETRACARBONYL
Authors: Kaesz H. D. , Huggins D. K.
Published: May 2006

A polynuclear tetracarbonyl of technetium, constituting a novel class of carbonyls for the manganese subgroup metals, is formed during the treatment of the pentacarbonyl, Tc2(CO)10, with sodium amalgam and subsequent acidification. The new derivative is characterized, and its possible structure is discussed.
ELEMENTAL ORGANIC COMPOUNDS: VI. SIGNIFICANCE OF π-RADICAL HYBRIDIZATION: NEW SYNTHETIC METHOD FOR BIS-ARENE π-COMPLEXES
Authors: Tsutsui Minoru , Chang George
Published: May 2006

The hypothesis of the existence of π-radical hybridization in aryl (M. Tsutsui. Ann. N.Y. Acad. Sci. 93, 133 (1961)) and vinyl (M. Tsutsui. Abstracts of Papers, 141st Meeting of the American Chemical Society, Washington, D.C. March, 1962. p. 3-O) coupling reactions has led us to a further investigation of the reactivity of highly active transition metal atoms in the so-called "radical state". As a result, a new synthetic method for bis-benzene-type π-complexes of transition metals has been discovered.
THE VAPOR PHASE POLYMERIZATION OF ETHYLENE ON AN ORGANOTITANIUM CATALYTIC SURFACE
Authors: Edgecombe F. H. C.
Published: May 2006

The polymerization of ethylene has been studied in the gas phase on a solid catalyst formed by the reaction of an organotitanium vapor with a solid crystalline titanium compound deposited on the walls of a reaction vessel.The rate of polymerization of ethylene was found to be, initially, of first order but as the reaction proceeded departure from the first-order case was observed.Experiments conducted under the condition of constant pressure as well as the usual constant-volume state enabled us, with the aid of an analogue computer, to devise a mathematical model which explained the experimental results in an unique fashion.A measure of the rate constant for catalyst decay was also obtained as well as the activation energy for the overall propagation step in the polymerization of ethylene.
NEW CONSIDERATIONS IN ORGANOGERMANIUM-SULPHUR CHEMISTRY
Authors: Henry Malcolm C. , Davidson Wenzel E.
Published: May 2006

The successful synthesis of sodium triphenylgermanethiol (1), (C6H5)3GeSNa, and disodium diphenylgermanedithiol, (C6H5)2Ge(SNa)2, have made it possible to carry out reactions with RX type compounds yielding a variety of organogermanium-sulphur compounds. In addition, triphenylgermanethiol, (C6H5)3GeSH, has been synthesized for the first time. Reactions of these compounds are related to analogous group IV element compounds. Physical and chemical properties of these new compounds are also discussed.
THE ELECTRONIC STRUCTURES AND REACTIVITIES OF Mn(CO)5X COMPLEXES
Authors: Gray Harry B , Billig Ernst , Wojcicki Andrew , Farona M.
Published: May 2006

The bonding in Mn(CO)5X complexes is described in terms of molecular orbitals. The axial CO group is assumed to be bonded much more strongly to Mn than the other four CO groups. The molecular orbital energy level scheme thus derived successfully accounts for the principal features of the electronic spectra of Mn(CO)5X complexes in different solvents. The first charge transfer band is assigned as an n(Mn) → π*(CO) type transition. This n → π* assignment is supported by the fact that the maximum of the band for Mn(CO)5Br is shifted to higher energies on increasing the polarity of the solvents employed.Kinetic studies of Mn(CO)5X-14CO exchange reveal that the axial CO is more inert than the other four CO groups; also, the rates of 14CO exchange of the four equivalent CO groups in Mn(CO)5X complexes depend strikingly on the nature of the X− ligand. A consistent interpretation of the above results and the observed kinetics of some typical substitution reactions of Mn(CO)5X complexes is presented in terms of the derived electronic structural description.
MECHANISMS OF THE REACTIONS OF DIETHYLZINC WITH ISOPROPANOL AND WATER
Authors: Herold R. J. , Aggarwal S. L. , Neff V.
Published: May 2006

Reactions of diethylzinc with isopropanol and water were studied by means of infrared absorption and gas evolution. The former method was found to be more reliable. Ethylzinc isopropoxide, formed from diethylzinc and isopropanol, was shown to be stable in the presence of excess isopropanol. The reaction of diethylzinc with water was found to proceed in a two-step manner, the product of the first being ethylzinc hydroxide. The decomposition of ethylzinc hydroxide was found to be first order with respect to itself and independent of diethylzinc.
REACTIONS OF IODINE ATOMS WITH N-BUTENES: I. CIS–TRANS ISOMERIZATION OF BUTENE-2
Authors: Back Margaret H. , Cvetanović; R. J.
Published: May 2006

In the interaction of iodine atoms with butene-2 at 65 °C no addition products are observed although cis–trans isomerization of the butene occurs readily. Iodine atoms have been generated by photolyzing iodine in three spectral regions. The limiting quantum yield of the isomerization reaction is about 0.1 at 4358 Å. The low quantum yield shows that chain reactions, similar to those observed in olefin photochlorinations and photobrominations, do not take place. A mechanism involving initial formation of π-complexes between iodine atoms and butene-2 is tentatively considered.
REACTIONS OF IODINE ATOMS WITH n-BUTENES: II. INTERCONVERSION OF BUTENE-1 AND BUTENE-2
Authors: Back Margaret H. , Cvetanović R. J.
Published: May 2006

In the vapor phase reaction of iodine atoms with n-butenes at 65 °C appreciable double-bond migration takes place in addition to the readily occurring geometrical isomerization. No detectable quantities of iodine-containing hydrocarbons are observed. In contrast to this, appreciable amounts of 1,3-butadiene and the corresponding amounts of hydrogen iodide are formed although direct abstraction of a hydrogen atom from butene by an iodine atom is unlikely in view of the endothermicity of this reaction. Formation of 1,3-butadiene is counterbalanced by its hydrogenation back to the original butene and its isomers and a steady state concentration is reached in the course of the reaction. As a consequence of this balancing of dehydrogenation and hydrogenation steps there is an induction period in the formation of butene-2 in the reaction of iodine atoms with butene-1 and a large part of butene-2 is found to be derived from the butadiene initially produced. To explain the occurrence of the endothermic steps, it is assumed that the initial iodine atom – butene adduct (iodobutyl radical or π-complex) interacts with a second iodine atom. Reaction mechanism is tentatively discussed.
THE NON-LINEARITY OF BIS-ARYLMERCURY COMPOUNDS
Authors: Horning W. C. , Lautenschlaeger F. , Wright G. F
Published: May 2006

The measured distortion polarizations of a group of bis-arylmercury compounds show that they do not exhibit exalted atom polarizations. The apparent orientation polarization of each is appreciable. Two of them, which are substituted symmetrically with methoxyl or nitro, exhibit moments expected from the rotation which is generated in such substances. By comparison of bis-4-bromophenylmercury202with the analogue containing the ordinary isotopic mixture of mercury the apparent moments are shown to be unrelated to nuclear asymmetry. The conclusion is unaltered that the apparent moments of bis-arylmercury compounds are due to effective non-linearity in the C—Hg—C bond.
EFFETS STÉRÉOÉLECTRONIQUES DANS LA DÉSAMINATION NITREUSE DES tert-BUTYL-4 AMINOMÉTHYL-1 CYCLOHEXANOLS cis ET trans
Authors: Favre H. , Gravel D.
Published: May 2006

not available
COUPLED GAS LIQUID – THIN LAYER CHROMATOGRAPHY: SIMULTANEOUS DETERMINATION OF PIPERITONE AND PIPERITONE OXIDE IN ESSENTIAL OILS
Authors: Nigam Ishwar C. , Sahasrabudhe M. , Levi Leo
Published: May 2006

Gas liquid and thin layer chromatography have been combined into a single microphysicochemical technique. The resolution of two terpenoids found in nature—piperitone and piperitone oxide—is described to illustrate the scope of the novel method of analysis. Occurrence of the epoxide in Mentha arvensis (Japanese mint), Mentha piperita (Mitcham peppermint), Eucalyptus dives Schauer, "Type" ("broad-leaved peppermint"), and Eucalyptus numerosa Maiden, var. "A" is reported for the first time. Its presence in these species should prove of biochemical as well as taxonomic interest.
REACTIONS OF PHENYL-SUBSTITUTED HETEROCYCLIC COMPOUNDS: II. NITRATIONS AND BROMINATIONS OF 1-PHENYLPYRAZOLE DERIVATIVES
Authors: Khan Misbahul Ain , Lynch Brian M. , Hung Yuk-Yung
Published: May 2006

Nitrations of 1-phenylpyrazole (I), 1-p-biphenylylpyrazole (II), and 1,5-diphenylpyrazole by "acetyl nitrate" (nitric acid – acetic anhydride) occur selectively in the 4-position of the pyrazole ring, as do brominations of I and II in chloroform solution. These results are in agreement with R. D. Brown's calculations of localization energies for electrophilic substitution in pyrazole.However, nitration of I by mixed acids at 12° yields 1-p-nitrophenylpyrazole, and bromination of I by bromine in concentrated sulphuric acid in the presence of silver sulphate yields 1-p-bromophenylpyrazole.The variations in orientation of substitution can be rationalized if the reacting species of I in strongly acidic solvents is the conjugate acid, in which the pyrazole ring is deactivated by protonation.
THE PHOTOCHEMICAL DECOMPOSITION OF METHYL AZIDE
Authors: Currie C. L. , Darwent B. deB.
Published: May 2006

The photolysis of methyl azide has been investigated in the vapor phase at low conversions and over suitable ranges of pressure, temperature, intensity, and wavelength. Under all conditions the principal gaseous product was N2with small amounts of H2(5–11%), and traces of CH4, C2H4, and C2H6. A condensate identified as (CH3N)xwas also found.The quantum yield for the production of N2is approximately 2, independent of intensity (over a 45-fold range), temperature (17–100 °C), and pressure (14–300 mm Hg). The quantum yield decreases slightly with increasing wavelength. Experiments with added CO2, CH3N2CH3, and C2H4indicate the presence of a short chain carried mainly by the CH3N radical. Excited species probably play some role in the reaction.
THE DEAMINATION OF ALICYCLIC α-AMINOKETONES
Authors: Edwards O. E. , Lesage M.
Published: May 2006

The deamination of α-aminocyclohexanones has been shown to give cyclopentane carboxylic acids, bicyclo[3,1,0]hexane-2-ones, and 2-methyl-2-cyclopentene-1-ones. Deamination of 3-endo-aminocamphor gave cyclocamphanone, 6-isopropenyl-6-methyl-2-cyclohexen-1-one, and 6- (1′-hydroxy-1′-methylethyl)-6-methyl-2-cyclohexen-1-one.The formation of bicyclo[3,1,0]hexane by deamination of cyclohexylamine is reported for the first time. The difference between the products from it and bornylamine and those from the corresponding α-aminoketones are rationalized on the basis of the amount of C—C participation in the corresponding carbonium ions.
CORRELATION OF CHEMICAL COMPOSITION AND OPTICAL ROTATION OF NATIVE XYLANS
Authors: Marchessault R. H. , Holava H. , Timell T. E.
Published: May 2006

The principle of optical superposition has been used to derive an equation relating the specific rotations of native xylans with their content of 4-O-methylglucuronic acid and/or arabinofuranose residues. The equation is in good agreement with literature data for the 4-O-methylglucuronoxylans and the arabinoxylans. Based on this correlation, an α-L-linkage is suggested for the arabinofuranose residues in various arabinose-containing xylans. Literature rotations for the 4-O-methylglucuronoarabinoxylans are consistently greater than values predicted by the equation. Finally, the rotatory dispersion behavior of acidic and neutral xylans is examined.
THE ISOLATION OF 1,8-DIHYDROXY-3-METHYL-9-ANTHRONE FROM THE ROOT OF RUMEX CRISPUS LINN.
Authors: Khan Ausat A.
Published: May 2006

not available
A PRELIMINARY STUDY OF SOME DITHIOSEMICARBAZONE–NICKEL(II) COMPLEXES
Authors: Gingras B. A. , Suprunchuk T. , Bernardini O. , Bayley C. H.
Published: May 2006

not available
THE COORDINATION OF SEVEN ELECTRON PAIRS
Authors: Britton Doyle
Published: May 2006

not available
THE BENZOYLOXY GROUP OF ACONITINE
Authors: Tsuda Y. , Marion Léo
Published: May 2006

not available
POLAROGRAPHY OF 8-HYDROXYQUINALDINE
Authors: Corsini A. , Graham R. P.
Published: May 2006

not available
ORGANIC PEROXIDES: VII. OXIDATION OF PHENYLHYDRAZONES WITH BENZOYL PEROXIDE
Authors: Edward J. T. , Samad S. A.
Published: May 2006

not available
STUDIES ON PIGMENTS OF PENICILLIUM FUNICULOSUM: I. PRODUCTION OF CHOLESTEROL
Authors: Chen Y. S. , Haskins R. H.
Published: May 2006

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THIOHYDANTOINS: V. IONIZATION OF 2,4-DITHIOHYDANTOINS AS ACIDS
Authors: Edward J. T. , Chin O. J.
Published: May 2006

not available
THE SYNTHESIS AND SUBSTITUTION REACTIONS OF 3,5-DI-tert-BUTYLPHENOL
Authors: Elder John W. , Mariella Raymond P.
Published: May 2006

3,5-Di-tert-butylphenol (I) was synthesized by two independent routes. It was possible to isolate a mononitro and a dinitro product. It was not possible to isolate a trinitrated product (3,5-di-tert-butylpicric acid). Bromination of I gave the dibrominated product, and chlorination of I gave a dichlorinated product and a tetrachloro product; the latter was shown to possess the dieneone structure.
PALLADIUM COMPLEXES OF DI-2-THIENYLKETOXIME
Authors: Holland William J. , Lee Leo
Published: May 2006

The reaction between di-2-thienylketoxime and the palladium (II) ion has been studied. The compounds prepared were the complexes dichlorobis(di-2-thienylketoxime-N,N′)palladium (II), biaquobis(di-2-thienylketoxime-N, N′) palladium (II) half hydrate, and polymeric forms of the chelate bis (di-2-thienylketoxime) palladium (II).
THE POLAROGRAPHY OF THE MAGNESIUM-ALIZARIN SYSTEM
Authors: Brewer D. G. , Page John A.
Published: May 2006

The polarography of alizarin alone, and alizarin in the presence of magnesium, has been studied in an ammonia–ammonium chloride electrolyte. Alizarin was found to give a reduction wave with E1/2 = −(0.14 + 0.059 pH) volts vs. S.C.E. and a polarographic diffusion coefficient D, equal to 1.20 × 10−6 cm2 sec−1over a range of pH from 7.4 to 10.0 in aqueous solution at 25 °C. The slope of the wave corresponded to a two-electron reversible process. The addition of magnesium caused a decrease in the polarographic wave for alizarin, but the combining ratio of magnesium to alizarin was a function of pH, ranging from 1.02 at pH 9.0 to 1.28 at pH 10.1. The combining ratio greater than unity could be attributed to alizarin adsorbed on a 1:1 (MgAlz) precipitate. The removal of alizarin from the solution was not quantitative in the presence of excess magnesium, and there is evidence of the formation of soluble complex species. The reaction is potentially useful for the indirect polarographic determination of magnesium.
STRESSES AND STRAINS IN ADSORBENT–ADSORBATE SYSTEMS: V. THERMODYNAMIC THEORY OF ADSORPTION-EXTENSION PHENOMENA
Authors: Flood E. A. , Farhan F. M.
Published: May 2006

The extensive thermodynamic variables of solids having large surface–volume ratios are usually not homogeneous functions of first degree in one another. In such systems mutual thermodynamic field potentials usually exist as between surface and interior regions. In general, mutual Helmholtz field potentials are not additive. When the lack of additivity of the Helmholtz potentials in adsorbate–adsorbent systems is independent of the quantity adsorbed, the changes in potentials of adsorbent and of adsorbate, due to adsorption, are additive and the equilibrium resembles the equilibrium of purely mechanical stresses. In such cases the adsorption potential is measured largely by the partial reversible relaxation of compressive and shear self-strain potentials of the solid adsorbent.
REACTIONS WITH SUBSTITUTED XANTHENONES: V. MANNICH REACTION ON HYDROXY-9-XANTHENONES AND HYDROXY-10-THIAXANTHENONES
Authors: Mustafa Ahmed , Sidky Mahmoud M. , Soliman Fouad M.
Published: May 2006

The application of the Mannich reaction to hydroxy-9-xanthenones and hydroxy-10-thiaxanthenones, which gives rise to the corresponding aminomethyl derivatives, is described. Experimental proof of the position taken by the aminomethyl group is given.
INTERDIFFUSION IN THALLIUM AMALGAMS
Authors: Foley W. T. , Reid L. E.
Published: May 2006

The interdiffusion coefficient of thallium in thallium amalgams was measured by the capillary reservoir technique. At 25 °C the values of 105D in cm2 sec−1 at 0.00365, 0.0536, 0.0895, 0.148, 0.188, 0.283, 0.323, and 0.404 mole fraction thallium were 1.08,1.37,1.50,1.37,1.14,0.83, 0.95, and 1.11 respectively with standard deviations in 10−5(cm2 sec−1) of 0.03, 0.06, 0.09, 0.10, 0.09, 0.08, 0.08, and 0.11 respectively. The minimum in the value of D at 0.288 mole fraction thallium shows that the compound Tl2Hg5 plays a significant role in the diffusion process. Values of ∂ ln a/∂ ln N for the thallium and for the compound were used to explain the dependence of D on the concentration.
ON THE RELATIONSHIP BETWEEN INTERNAL PRESSURE AND ULTRASONIC VELOCITY
Authors: Srivastava S. C. , Berkowitz N.
Published: May 2006

Because of the relevance of internal pressure data to sonochemical kinetics, some interest attaches to expressions which permit evaluation of Pi from readily available or easily measured quantities. One such expression is developed in this paper. It relates Pi to the velocity u of ultrasonic waves transmitted through the liquid and takes the form u√D = K′√(Rm)Pi where K′ is a constant proportional to √(Cp/Cv)√(1/RT), and D and Rm denote the density and molar refraction of the liquid.The utility of this expression is tested against some 100 liquids (including a few binary liquid mixtures and aqueous electrolyte solutions), and it is shown that the equation offers an acceptable and quite general method for calculating Pi.
THE PREPARATION AND REACTIONS OF SOME SIMPLE 2,8-DISUBSTITUTED PURINES AND RELATED DERIVATIVES
Authors: Lewis Arthur F. , Beaman Alden G. , Robins Roland K.
Published: May 2006

Several previously unknown, simple 2,8-disubstituted purines have been prepared. The readily available (see H. Ballweg, Ann. 649, 114 (1961); and A. G. Beaman and R. K. Robins, J. Appl. Chem. (London), 12, 432 (1962)) 2,8-dichloropurine proved to be a most valuable synthetic intermediate in this work. The chemical reactivity of 2,8-dichloropurine toward nucleophilic substitution has been studied.
THE THERMAL DECOMPOSITION OF PERACETIC ACID IN THE VAPOR PHASE
Authors: Schmidt C. , Sehon A. H.
Published: May 2006

The thermal decomposition of peracetic acid in a stream of toluene was studied over the temperature range 127–360 °C. The main products of the reaction were CO2, CH3COOH, C2H6, CH4, HCHO, O2, and traces of CO. Dibenzyl was also formed.The overall decomposition of peracetic acid was partly heterogeneous and was represented by the two parallel primary reactions[Formula: see text]

[Formula: see text]The dissociation energy of the O—O bond in peracetic acid was estimated to be 30–34 kcal/mole.
MONOFLUOROSUCCINIC ACID
Authors: Dean F. H. , Pattison F. L. M.
Published: May 2006

not available
6-O-METHANESULPHONYL-D-GALACTOSE
Authors: Mitchell D. L.
Published: May 2006

not available
PRESSURE EFFECT AND MECHANISM IN ACID CATALYSIS XIII. HYDROLYSIS OF METHYL α-D-GLUCOPYRANOSIDE
Authors: Withey R. J. , Whalley E.
Published: May 2006

not available
TEMPERATURE AND SOLVENT EFFECTS ON THE PROTON MAGNETIC RESONANCE SPECTRUM OF BIS(2,2-DICHLOROCYCLOPROPYL) ETHER
Authors: Hutton H. M. , Schaefer T.
Published: May 2006

The proton magnetic resonance spectrum of bis(2,2-dichlorocyclopropyl) ether consists of two partially overlapping ABX spectra due to the meso and d,l isomers. A study of the temperature dependence of the spectra in different solvents demonstrates the existence of complex formation with benzene. It is found that for the most abundant isomer the heat of formation of the complex is −1700 ± 100 cal/mole, entropy of formation is −6.2 ± 0.3 e.u. The association shifts are 52 ± 2 c.p.s., 64 ± 5 c.p.s., and 88 ± 5 c.p.s. at 60 Mc/s for the three protons situated at different points in the molecule.
THE STRUCTURE OF "METACHLORAL" (2,4,6,8-TETRAKIS-(TRICHLOROMETHYL)-1,3,5,7-TETROXACANE), A NEW CYCLIC TETRAMER OF CHLORAL
Authors: Barón Máximo , Mandirola O. Brieux De , Westerkamp J. F.
Published: May 2006

The structure of metachloral is established by n.m.r., infrared, and dipole moment studies.
DERIVATIVES OF DEHYDROABIETIC AND PODOCARPIC ACIDS
Authors: Wenkert Ernest , Beak Peter , Carney Richard W. J. , Chamberlin James W. , Johnston David B. R. , Roth C. Deane , Tahara Akira
Published: May 2006

The lithium aluminum hydride reduction of nitriles in the aromatic resin acid series to aldimines and the conversion of the products to other derivatives are described. The effect of the stereochemistry of the nitriles on the rate of reduction is noted. The transformation of dehydroabietane into a dehydro product is indicated. The syntheses of a desoxydecarboxy-5,6-dehydro-7-keto derivative of podocarpic acid and its optical antipode are discussed. The stereochemistry of hydrogenation of 5,6-dehydro derivatives of podocarpic acid is reported. The effect of a 7-keto group on the rate of hydrolysis of methyl esters of aromatic resin acids is illustrated. The reactions of 6-bromo-7-keto derivatives of methyl podocarpate with bases are portrayed.
ULTRAVIOLET IRRADIATION OF PYRIMIDINE DERIVATIVES: IV. ANIONIC EFFECTS ON THE PHOTOLYSIS OF CYTOSINE AND O-METHYLCYTOSINE
Authors: Moore A. M.
Published: May 2006

The course of the photochemical reactions involved in the photolysis of O-methylcytosine is strongly affected by the presence of various anions. Similar anionic effects were noted during the photolysis of cytosine but the products of this reaction appeared to be less suitable for further investigation. Ultraviolet irradiation of O-methylcytosine in water leads to destruction of the characteristic absorption bands, while irradiation in phosphate leads to the production of a new compound with marked absorption at 300 mμ, and irradiation in pyrophosphate, glycero-phosphate, citrate, or cacodylate leads to the production of compounds with marked absorption at 274 mμ. The phosphate-dependent photolysis of O-methylcytosine has been studied in some detail and the product has been isolated and purified. Apparently the H2PO4− ion acts as a catalyst in a reaction which involves the loss of 1 mole of ammonia and the addition of 2 moles of water to O-methylcytosine.
A STUDY OF Cd115m,g FORMED IN THE FISSION OF NATURAL URANIUM BY PROTONS OF ENERGIES 8 TO 60 MEV
Authors: Tilbury R. S. , Yaffe L.
Published: May 2006

Excitation functions have been measured for the formation of Cd115m, Cd115g, and Ag115g produced in the fission of natural uranium induced by protons of energies 8 to 60 Mev. The isomer yield ratio for Cd115m,g was found to increase with increasing proton bombarding energy over the range 20 to 60 Mev in contrast to the published results for the deuteron fission of uranium, for which a minimum was found.
KINETICS AND MECHANISMS OF THE PYROLYSIS OF DIMETHYL ETHER: I. THE UNINHIBITED REACTION
Authors: McKenney D. J. , Laidler K. J.
Published: May 2006

An experimental study has been made of the thermal decomposition of dimethyl ether, the temperature range being 500 to 550 °C and the pressure range 100 to 700 mm Hg. A considerable surface effect was noted, and the results were not very reproducible. The reaction was of the three-halves order and the rate constant could be expressed as 2.98 × 1014e−54,900/RT cc1/2 mole−1/2 sec−1. On the basis of the results obtained in the presence of hydrogen sulphide (D. J. McKenney and K. J. Laidler. Can. J. Chem. 41, 2009 (1963)) it is concluded that the initiating step, the dissociation of CH3OCH3 into CH3O and CH3, is in its second-order region. In order for the overall order to be three-halves the main terminating step must be either of the type ββM or βμ. The concentrations of the various radicals, and the rates of the various chain-ending steps, are calculated from known or estimated kinetic parameters for the elementary processes. It is concluded that the predominant chain-ending step is probably CH3 + CH3 + M → C2H6 + N, but that there may be a significant contribution from CH3 + CHO + M → CH3CHO + M and from CH3 + CH2OCH3 + M → C2H5OCH3 + M.
THE METAL-CATALYZED AUTOXIDATION OF TETRALIN: II. THE COBALT-CATALYZED AUTOXIDATION OF UNDILUTED TETRALIN AND OF TETRALIN IN CHLOROBENZENE
Authors: Kamiya Y. , Beaton S. , Lafortune A. , Ingold K. U.
Published: May 2006

The catalysis of the autoxidation of tetralin by the cobalt salts of 10 organic acids has been examined at 50 °C over a concentration range from 2 × 10−6to 1.0 mole/l, of cobalt. The measured rate of oxidation reaches a limiting value at cobalt concentrations above 2 × 10−2mole/l., which is about half the expected limiting rate. The cobalt salt catalysts are deactivated during the oxidation, probably in the initiation reaction with hydroperoxide, each cobalt atom being capable of decomposing about 100 molecules of hydroperoxide. Upon correcting the measured limiting rate for cobalt deactivation and for the amount of tetralin consumed at the point where the rate reaches a maximum value an extrapolated limiting rate about equal to the expected value is obtained. Although no steady concentration of hydroperoxide occurs during the oxidation the results suggest that the limiting rate of oxidation is basically due to the same phenomena that produce a limiting rate for the cobalt-catalyzed autoxidation of tetralin in acetic acid (Y. Kamiya et al. Can. J. Chem. 41, 2020 (1963)).
INTENSITIES OF EMISSION LINES IN FLAMES OF METAL HALIDES WITH ACTIVE NITROGEN
Authors: Phillips L. F.
Published: May 2006

The intensities of spectral lines emitted by flames of a number of metal halides with active nitrogen have been found to vary as the square of the nitrogen atom concentration. When the total energy required for simultaneous dissociation of the halide and excitation of the metal atom is less than about 200 kcal/mole the energy transfer process is too efficient to be attributed to the termolecular reaction of a halide molecule with a pair of nitrogen atoms. The observations are consistent with the hypothesis that in this case energy is transferred to the halide molecule during collision with a nitrogen molecule in the 5Σg+ state. Possible excitation mechanisms are discussed for less intense lines which would require up to 276 kcal/mole for simultaneous dissociation and excitation.
REACTIONS OF PHENYL-SUBSTITUTED HETEROCYCLIC COMPOUNDS: III. FREE-RADICAL PHENYLATION OF 1-PHENYLPYRAZOLE
Authors: Lynch Brian M. , Khan Misbahul Ain
Published: May 2006

Phenyl radicals furnished by benzoyl peroxide attack both rings of 1-phenylpyrazole, and the orientation of substitution has been examined using gas–liquid partition chromatography.Substitution occurs at all positions of the phenyl ring, although predominantly at the ortho positions, while attack in the pyrazole ring is confined to the 3-position. The results are in agreement with the suggestion that the free valence at a given position is a major factor in determining the orientation of free-radical phenylation of 1-phenylpyrazole, but in conflict with predictions from resonance theory.
DERIVATIVES OF MONOGERMANE: PART III. INFRARED SPECTRA OF THREE DIHALOGERMANES
Authors: Srivastava T. N. , Griffiths J. E. , Onyszchuk M.
Published: May 2006

not available
THE ELECTRON SPIN RESONANCE SPECTRA OF GAMMA-IRRADIATED THIOSULPHATE
Authors: Eager R. L. , Mahadevappa D. S.
Published: May 2006

not available
NUCLEAR SPIN–SPIN COUPLING IN C13-ENRICHED ACETYLENE, ETHYLENE, AND ETHANE
Authors: Graham D. M. , Holloway C. E.
Published: May 2006

not available
SOLVOLYSIS IN LIGHT AND HEAVY WATER: V. EFFECT OF DIOXANE ON THE SOLVENT ISOTOPE EFFECT WITH t-BUTYL CHLORIDE
Authors: Craig Wm. G. , Hakka Leo , Laughton P. M. , Robertson R. E.
Published: May 2006

not available
TRITIATION OF AROMATICS BY HTO-PROMOTED ALUMINUM CHLORIDE
Authors: Măntescu Constanţa , Balaban Alexandru T.
Published: May 2006

not available
THERMAL DECOMPOSITION OF MOLECULAR COMPLEXES: II. β-QUINOL CLATHRATES
Authors: McAdie H. G.
Published: May 2006

The β-quinol clathrates of nitrogen, carbon dioxide, methanol, and methyl cyanide decompose at temperatures well below the melting point of the host quinol lattice. The accompanying endothermal effect is broad, indicating that the decomposition occurs gradually over a considerable temperature range. The clathrate decomposition was verified by measurement of the gas evolved. The enthalpy change accompanying decomposition correlates closely with the energy of interaction of the guest molecule with the β-quinol lattice, and the decomposition of the clathrate is suggested to occur by a lattice distortion mechanism in which the size and shape of the guest molecule are important.
REACTION MECHANISM STUDIES: I. THE DIAXIAL → DIEQUATORIAL REARRANGEMENT OF BROMOHYDRIN SULPHONATE ESTERS
Authors: King J. F. , Pews R. G. , Simmons R. A.
Published: May 2006

3α-Bromocholestan-2β-yl p-toluenesulphonate on heating in solution rearranges to an equilibrium mixture in which the diequatorial isomer, 2α-bromocholestan-3β-yl p-toluenesulphonate, predominates. 2β-Bromocholestan-3α-yl p-toluenesulphonate and the corresponding diaxial benzenesulphonate and p-nitrobenzenesulphonate rearrange analogously. These are the first examples of the diaxial → diequatorial rearrangement with sulphonic esters. Replacement of the para methyl group of 2β-bromocholestan-3α-yl p-toluenesulphonate by more electrophilic substituents is accompanied by an increase in the rate of rearrangement. It is concluded that in the transition state the bromine atom is positively charged and the sulphonate group negatively charged relative to the starting material.
AUTOMATIC ADIABATIC SOLUTION CALORIMETER USING THERMISTORS
Authors: Benjamin Lawrence
Published: May 2006

A calorimeter is described, of capacity 40–50 ml, which is suitable for the investigation of solutions between 0 °C and 70 °C. Temperatures are measured to better than 0.0001 °C using thermistors and the latter are also used to provide automatic adiabatic control. A novel mechanism is used for opening sample cells and the associated heat effect can be measured with a precision of 0.01 cal or better. Stirring of the calorimeter is achieved by continuous rocking of the vessel through 180°. The performance of the calorimeter is illustrated by results obtained for the heat of solution of NaCl at 25 °C.
SPECTROPHOTOMETRIC STUDY OF XANTHATE AND DIXANTHOGEN SOLUTIONS
Authors: Pomianowski A. , Leja J.
Published: May 2006

Xanthate solutions of pH 6–10, prepared from "aged" potassium ethyl xanthate crystals, KEtX, were investigated spectrophotometrically in the region 190–400 mμ and showed coexistence of xanthate ions, EtX−, dixanthogen, (EtX)2, and carbon disulphide, CS2. Optical density measurements on the spectra of dixanthogen solutions led to the evaluation of: molar absorptivities of dixanthogen at wavelengths corresponding to the two main bands in the xanthate ion spectrum, i.e. at 301 mμ—6130 liter/mole cm, and at 226 mμ—18,400 liter/mole cm; the solubility of dixanthogen, ca. 1.3 × 10−5 mole/liter; and the equilibrium constant, k = 3 × 1010, of the reaction 2(EtX)2 + 4OH− → 4EtX− + 2H2O + O2, for solutions saturated with air at atmospheric pressure. Simultaneous reactions leading to decomposition of xanthate and/or dixanthogen species to alcohol and carbon disulphide have been detected by a strong band at 206.5 mμ due to CS2 (with an estimated molar absorptivity of the order of 60,000–70,000 liter/mole cm).
X-RAY DIFFRACTION DATA FOR AMMONIUM TETRATHIOTUNGSTATE
Authors: Mooney R. W. , Hoffman C. W. W.
Published: May 2006

The tetrathiotungstate salt of ammonia has been prepared. Zero-layer Weissenberg photographs have been used to establish that this material is orthorhombic with a = 9.623 Å, b = 12.406 Å, and c = 7.055 Å with space group Pn21a—C2v9 or Pnma—D2h16. The data have been used to index the Debye–Scherrer pattern.
CONTRIBUTION CONCERNING THE PROBLEM OF THE INTRAMOLECULAR HYDROGEN BONDS IN ORTHO HALOPHENOLS
Authors: Bourassa-Bataille Henriette , Sauvageau P. , Sandorfy C.
Published: May 2006

The infrared spectra of the four ortho halophenols were measured in carbon tetrachloride solutions containing variable amounts of ether. The integrated intensities of the stretching band corresponding to the intermolecularly hydrogen-bonded OH groups were determined and plotted against ether concentration. From the curves obtained in this manner it was possible to deduce the relative strengths of the intramolecular hydrogen bonds which are present in these molecules. They are, in order of increasing strength: F < I < Br < Cl. This result is compared to others, published in the literature, obtained using alternative methods.
THE ELECTRON DENSITY DISTRIBUTIONS IN HYDRIDE MOLECULES: III. HYDROGEN FLUORIDE
Authors: Bader R. F. W. , Jones G. A.
Published: May 2006

An electron density distribution is determined for the hydrogen fluoride molecule in its equilibrium configuration by requiring the distribution to predict the correct dipole moment and to exert forces on the nuclei equal and opposite to the nuclear forces of repulsion. The ability of the density function to give good estimates of the expectation values of other one-electron operators is found to be satisfactory. It is shown that an electron population analysis of the orbital densities, when interpreted in terms of the electronic forces which these densities exert on the nuclei, is of value in the understanding of chemical binding.
NEUTRAL EXTRACELLULAR GLUCAN OF PULLULARIA PULLULANS (DE BARY) BERKHOUT
Authors: Sowa W. , Blackwood A. C. , Adams G. A.
Published: May 2006

A neutral extracellular glucan ([α]D23 + 189°) was produced in 12% yield by Pullularia pullulans (de Bary) Berkhout grown on a glucose substrate. A single symmetrical peak on free-boundary electrophoresis in borate and acetate buffers was evidence of homogeneity. Infrared spectroscopy showed that the predominant glucoside linkages were α(1 → 4) and α(1 → 6) with a small proportion of α(1 → 3). Graded acid hydrolysis under conditions of minimum reversion yields glucose, maltose, isomaltose, nigerose, panose, and isomaltotriose. In addition, a trisaccharide, O-α-D-glucopyranosyl-(1 → 4)-O-α-D-glucopyranosyl-(1 → 6)-D-glucopyranose, was isolated. Another trisaccharide was isolated and tentatively identified as O-α-D-glucopyranosyl-(1 → 4)-O-[α-D-glucopyranosyl-(1 → 6)]-D-glucose and hence a small degree of branching may occur in the molecule. The present study has confirmed previous observations that the main linkages are α(1 → 4) and α (1 → 6) and has provided unequivocal proof of the presence of α (1 → 3) linkages. Periodate oxidation studies confirmed the foregoing structural features and showed that the glucan was linked α(1 → 4), 65%; α(1 → 6), 29%; and α(1 → 3), 6%.
CYCLOHEXANE COMPOUNDS: IV. NUCLEAR MAGNETIC RESONANCE SPECTRA OF SOME DERIVATIVES OF THE STEREOISOMERIC 3-AMINO-1,2-CYCLOHEXANEDIOLS
Authors: Anet F. A. L. , Bannard R. A. B. , Hall L. D.
Published: May 2006

The n.m.r. spectra of 1α-methoxy-2β-hydroxy-3α-aminocyclohexane, 1α-methoxy-2α-hydroxy-3β-aminocyclohexane, their N-acetyl and O,N-diacetyl derivatives, ethoxy analogues, and 3α-amino-1α,2β-cyclohexanediol and 3β-amino-1α,2β-cyclohexanediol triacetates were measured in chloroform solution. From the chemical shifts of the O- and/or N-acetyl methyl protons it was possible to assign conformations to all the substituted derivatives and in most cases the assignments thus made were confirmed by first-order analysis of the multiplet pattern from the methine protons. In all cases, the conformations found were those predicted on simple conformational grounds and no evidence for a conformational equilibrium at room temperature was obtained from the coupling constants. In general, the coupling constants for the methine protons followed the pattern predicted by the Karplus equation. Acetylation of the 1α-alkoxy-2α-hydroxy-3β-aminocyclohexanes with acetic anhydride gave both the O,N-diacetyl derivative and the O,N,N-triacetyl derivative.
RING-PROTON CHEMICAL SHIFTS OF SOME SUBSTITUTED ANILINES IN CARBON TETRACHLORIDE AND TRIFLUOROACETIC ACID
Authors: Reynolds W. F. , Schaefer T.
Published: May 2006

The chemical shifts of the ring-proton spectra of a series of substituted anilines are reported relative to internal benzene in the solvents carbon tetrachloride and trifluoroacetic acid. The substituent parameters in cyclohexane derived by Martin can be used together with our parameters for the para-fluoro and -ammonio (NH3+) groups to demonstrate additivity of the substituent effects in both carbon tetrachloride and trifluoroacetic acid. The somewhat puzzling ring-proton shifts in the latter solvent are attributed to counterion effects arising from a juxtaposition of the two centers of charge. Steric hindrance to π-overlap of the amino group with the ring is demonstrated in certain cases and a parallel behavior is found between the ring-proton shifts and the electronic spectra of these molecules.
STRUCTURAL RELATIONSHIPS OF EXTRACELLULAR POLYSACCHARIDES FROM PHYTOPATHOGENIC XANTHOMONAS SPP.: PART II. X. HYACINTHI, X. TRANSLUCENS, AND X. MACULOFOLIIGARDENIAE
Authors: Gorin P. A. J. , Spencer J. F. T.
Published: May 2006

The extracellular polysaccharide formed from Xanthomonas hyacinthi is shown to be a branched polymer containing glucuronic acid, mannose, and glucose. Acid and enzymic hydrolysis show the presence of β-D-Glp 1 → 4 D-Man and the 4-unit sequence β-D-GlpA1 → 2 D-Manp 1 → 3 β-D-Glp 1 → 4 D-Gl. Examination by the methylation technique showed the presence of a considerable proportion of 2-linked mannopyranose units. The spectrum of methyl glycosides formed from this polysaccharide and those from Xanthomonas maculofoliigardeniae and Xanthomonas translucens are similar, and in terms of sugar linkages differentiate them from that of Xanthomonas stewartii, which contains glucuronic acid, glucose, and galactose.
REARRANGEMENT STUDIES WITH C14: XV. ETHYL-2-C14 IODIDE FROM THE IRRADIATION OF ETHYL-1-C14 IODIDE WITH COBALT-60 GAMMA RAYS
Authors: Bhardwaj I. S. , Lee C. C.
Published: May 2006

Irradiation of ethyl-1-C14 iodide gave ethyl-2-C14 iodide with Gr of 0.27–0.28 for samples that were either deaerated or not deaerated. Addition of 1% by weight of iodine before irradiation decreased the extent of rearrangement to nearly zero. The occurrence of 1,2-hydrogen shifts in ethyl radicals outside of the spurs, which may be susceptible to scavenger action, is suggested as a possible path which would lead to the ethyl-2-C14 iodide.
THE SYNTHESIS OF 5-O-β-D-GLUCOPYRANOSYL-D-XYLOSE AND 3,5-DI-O-β-D-GLUCOPYRANOSYL-D-XYLOSE
Authors: Jones J. K. N. , Reid P. E.
Published: May 2006

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THE STRUCTURAL SIGNIFICANCE OF GLYCERALDEHYDE AND GLYCOLLIC ALDEHYDE IN POLYSACCHARIDE DEGRADATIONS AND THEIR RECOVERY AND IDENTIFICATION AS THE REDUCED ANALOGUES
Authors: Unrau A. M.
Published: May 2006

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FREE RADICALS BY MASS SPECTROMETRY: XXXI. H-ATOM AND D-ATOM REMOVAL IN THE MERCURY-PHOTOSENSITIZED DECOMPOSITION OF ISOBUTANE AND DEUTEROISOBUTANES
Authors: Palmer T. F. , Lossing F. P.
Published: May 2006

In the reaction of isobutane with Hg3P1 atoms, cleavage of the tertiary C—H bond is about seven times as frequent as cleavage of a primary C—H bond. This ratio is greatly changed by deuterium substitution in the tertiary position. Cleavage of the tertiary C—D bond in (CH3)3CD occurs only about 0.6 times as frequently as cleavage of a primary C—H bond. In (CD3)3CH, no cleavage of a primary C—D bond could be detected, and only the tertiary H-atom is removed.
REPLACEMENT REACTIONS IN THE QUINIC ACID SERIES
Authors: Gorin P. A. J.
Published: May 2006

The action on D-quinic acid of hot 95% acetic acid containing mineral acid gave, after complete acetylation, 1,4,5-tri-O-acetyl-epi-quinide consisting of approximately equal portions of the (−)- and (±)-isomers, and tetra-O-acetyl-scyllo-quinic acid. The stereochemistry of the products and their derived free polyols were determined by nuclear magnetic resonance (n.m.r.) spectroscopy and synthesis.Elimination of the tosyloxy group in 5-tosyl-epi-quinicol was shown to take place readily in aqueous acetic acid with participation of the primary carbinol group to give an anhydro quinicol derivative and epi-quinicol.
PROTON MAGNETIC RESONANCE SPECTRUM OF 1-PHENYLCYCLOPROPYLCARBOXYLIC ACID: A2B2 SPECTRA OF CYCLOPROPANES
Authors: Hutton H. M. , Schaefer T.
Published: May 2006

A2B2 spectra of 1,1 -disubstituted cyclopropanes have been calculated over a range of values of the spectral parameters. The sign of the geminal coupling is opposite to that of the vicinal couplings. Since this is also the case with other saturated ring systems the theoretical spectra should be useful in studies of other saturated ring systems.The shifts and coupling constants are given for the protons in 1-phenylcyclopropylcarboxylic acid in solution in carbon disulphide, chloroform, and benzene as an example of the A2B2 analysis. The ring protons in 1-phenylcyclopropylcarbinol were found to be equivalent in different solvents, with insignificant coupling to the protons in the methylene and phenyl groups. A qualitative discussion of the shifts of the various protons in various solvents is given.
THE CONSTITUTION OF A SYNTHETIC GLUCAN: II. METHYLATION STUDIES
Authors: Dutton G. G. S. , Unrau A. M.
Published: May 2006

After repeated and vigorous treatments, a fully methylated glucan was obtained. Hydrolysis of the methylated glucan with sulphuric acid gave tetra-, tri-, di-, and mono-O-methyl-D-glucoses in a 5:5:3:1 ratio. Both the furanose and pyranose tetramethyl isomers were identified. Nearly all of the possible pyranose and furanose cyclic trimethylglucoses were positively identified. An attempted resolution of the dimethylglucoses was relatively unsuccessful. The monomethylglucoses were identified by electrophoresis.
NUCLEAR MAGNETIC RESONANCE MEASUREMENTS OF PROTON EXCHANGE IN ALCOHOL–WATER SYSTEMS: PART II. n-C3H7OH–H2O AND i-C3H7OH–H2O
Authors: Paterson W. G.
Published: May 2006

Recent methods of analysis of exchange-broadened n.m.r. multiplets are used to make measurements of multiplet spacings and line widths in the n.m.r. spectra of n-C3H7OH–H2O and i-C3H7OH–H2O solutions. The data are interpreted in terms of the proton exchange reaction [Formula: see text](R = n-C3H7 and i-C3H7) for which rate constants k = 1.7 ± 0.3 (R = n-C3H7) and 0.35 ± 0.06 (R = i-C3H7) l. mole−1 sec−1 at 42 ± 1° are suggested. Possible exchange mechanisms are discussed.