bluuebunny/crossref_metadata_2025 huggingface dataset:
THE REVERSIBLE ELECTRODE POTENTIAL OF THE SYSTEM U/UCl3 IN MOLTEN CHLORIDE SOLVENTS
Authors: Inman D. , Bockris J. O'M.
Published: May 2006

not available
REDUCTIVE CLEAVAGE OF NITROGEN–NITROGEN BONDS WITH RANEY NICKEL AND HYDRAZINE
Authors: Robinson F. P. , Brown R. K.
Published: May 2006

Raney nickel and hydrazine readily cleave the nitrogen–nitrogen bond of a number of N,N′-diacylated hydrazines to produce the corresponding amides in good yield.
GAS–LIQUID CHROMATOGRAPHY OF TERPENES: PART IV. THE ANALYSIS OF THE VOLATILE OIL OF THE LEAVES OF EASTERN WHITE CEDAR
Authors: Rudloff E. von
Published: May 2006

The complete analysis of the neutral volatile oil of the leaves of Eastern white cedar (Thujaoccidentalis L.) by means of gas–liquid chromatography was attempted. The mixture of terpenes was resolved into 28 monoterpenoid components and the major ones were isolated in 5- to 20-mg amounts. Comparison of infrared spectra and retention times with those of authentic specimens led to the positive identification of d-α-pinene, camphene, sabinene, d-limonene, p-cymene, γ-terpinene, l-fenchone, l-α-thujone, d-isothujone, camphor, and bornyl acetate. α-Thujene, β-pinene, myrcene, 1,8-cineole, terpinolene, and terpinen-4-ol were tentatively identified. The percentage composition of a commercial sample of the oil and of one obtained from a tree grown in Saskatoon was determined. The latter oil contained 7.0 to 7.5% of sesquiterpenoid components, which were resolved into four peaks on polyester columns at 180 °C.
SULPHONIUM SALT SOLVOLYSIS: PART I. EFFECT OF CONCENTRATION, ANION TYPE, AND SOLVENT VARIATION ON RATE OF REACTION
Authors: Hyne J. B.
Published: May 2006

Previous work on the mechanism of sulphonium salt solvolysis is reviewed briefly. Rate data, determined by two independent methods, is presented for the solvolysis of dimethyl-t-butyl sulphonium iodide, bromide, and chloride in water and various ethanol–water mixtures. Rate dependence on the anion character and concentration of salt is shown to develop as the dielectric constant of the medium is lowered. The results are interpreted in terms of the increasing importance of an ion-pair mechanism as the composition of the medium is changed. The interpretation is substantiated by independent evidence for ion-pair formation.
THE KINETICS OF THE REACTION OF SILICA WITH GROUP I HYDROXIDES
Authors: Hooley J. G.
Published: May 2006

A method is presented for preparing a reproducible silica glass or quartz surface that does not craze during rate of solution measurements in solutions of the five group I hydroxides. For silica glass, initial rates are a maximum at 8 M for at least NaOH and KOH and are an inverse function of ion size for the five cations and tetramethyl ammonium ion. A proposed mechanism of water addition followed by reaction with hydroxyl ion is used to explain the maximum rate and the effect of solution products and the substitution of methanol for water as a solvent. For quartz an explanation is offered for the lower rate and for the absence of a maximum rate below 27 M NaOH. A common temperature coefficient of 20 kcal mole−1 is reported for all reactions in water. The crazing of finely ground or polished silica glass surfaces is related to the presence of surface cracks and their enlargement by possible conversion of some silica to quartz in NaOH solution.
THE SULPHURIC ACID SOLVENT SYSTEM: PART II. CONDUCTIVITY MEASUREMENTS ON SOLUTIONS OF SOME ACIDS
Authors: Barr J. , Gillespie R. J. , Robinson E. A.
Published: May 2006

Conductivity measurements have been made on solutions of the following substances in sulphuric acid: HClO4, HSO3F, HSO3Cl, HPO2F2, HAs(HSO4)4, CH3SO3H, and CF3CO2H. Of these substances HSO3F, HSO3Cl, HAs(HSO4)4, and probably HClO4, behave as acids, CF3CO2H is a non-electrolyte, and HPO2F2, and probably CH3SO3H, are bases of the sulphuric acid system. Acid dissociation constants for HSO3F, HSO3Cl, and HAs(HSO4)4 have been determined by comparing the conductivities of their solutions with those of H2S2O7, whose dissociation constant is known from other measurements, and also by conductimetric titration with a strong base, e.g. KHSO4. These acids of the sulphuric acid system decrease in strength in the order HSO3F > HAs(HSO4)4 > HSO3Cl > HClO4.
STEROIDS: II. THE STEREOCHEMISTRY OF THE ADDITION OF GRIGNARD REAGENTS TO 12-KETOSTEROIDS
Authors: Nagarajan R. , Just George
Published: May 2006

The action of methyl magnesium iodide on 3α,20α-diacetoxypregnan-12-one (IIa) led to the formation of the epimeric 12-methyl-12-hydroxypregnanes III and V, in which the 12α-hydroxy-12β-methyl isomer III predominated.Infrared measurements on the corresponding 12-hydroxy-12-methylpregnane-3,20-diones VI and IV permitted unambiguous assignment of configuration at C12.The pregnanedione IV was transformed to 12β-hydroxy-12α-methylprogesterone.
PHYTIC ACID: AN ANALYTICAL INVESTIGATION
Authors: Brown E. C. , Heit M. L. , Ryan D. E.
Published: May 2006

Acid–base titrations in aqueous and non-aqueous solutions, titrations with metal ions, and analyses of various metal phytates support beyond question the 18-acid structure of phytic acid. Six of the hydrogens are too weakly acidic to be ordinarily titratable in water; in aqueous solution, two distinct breaks occur in the titration curve corresponding to the titration of 8 and 12 protons of phytic acid.
SYNTHÈSES DE COURTS PEPTIDES RENFERMANT DES ACIDES AMINO-1 CYCLOALKYL CARBOXYLIQUES
Authors: Tailleur Patrice , Berlinguet Louis
Published: May 2006

Using classical methods of synthesis nine small peptides containing amino-1 cycloalkyl carboxylic acids have been synthesized. The cyclic acids have been placed either at the N-terminal or at the C-terminal positions or in between two natural amino acids, glycine and DL-phenylalanine.The cyclization of two dipeptides into a substituted diketopiperazine, and the subsequent hydrolysis of this compound have been studied.
A NEW QUATERNARY APORPHINE FROM FAGARA TINGUASSOIBA HOEHNE
Authors: Riggs N. V. , Antonaccio L. , Marion Léo
Published: May 2006

An alkaloid isolated as picrate from Fagaratinguassoiba gives rise on methylation to a derivative of glaucine. It has been shown to be the 6-hydroxy-2,3,5-trimethoxy-N,N-dimethylaporphinium ion.
THE CONVERSION OF α-KETO ACIDS AND OF α-KETO ACID OXIMES TO NITRILES IN AQUEOUS SOLUTION
Authors: Ahmad A. , Spenser Ian D.
Published: May 2006

The conversion of α-oximino acids (anti HO— —COOH) to nitriles in aqueous solution is shown to be a general reaction. α-Keto acids are converted to nitriles in excellent yield in aqueous solution in the presence of hydroxylamine. Oxidation of α-oximino acids yields hydroxamic acids.
THE PREPARATION OF ALKOXIDES AND TRIETHYLSILANOLATES OF Ti, Zr, V, Nb, Ta, AND Sn FROM THE DIALKYLAMIDES
Authors: Thomas I. M.
Published: May 2006

not available
THE REACTION OF 2,2-DIPHENYL-1-PICRYLHYDRAZYL WITH 9,10-DIHYDROANTHRACENE AND 1,4-DIHYDRONAPHTHALENE
Authors: Hogg J. S. , Lohmann D. H. , Russell K. E.
Published: May 2006

not available
THE HYDROGEN ISOTOPE EFFECT IN THE PYROLYSIS OF CYCLOPROPANE
Authors: Blades Arthur T.
Published: May 2006

The hydrogen isotope effect in the thermal rearrangement of cyclopropane has been determined by the copyrolysis of cyclopropane and cyclopropane-d6. The isotope effect in the temperature range 407–514 °C and at pressures of about 60 cm Hg may be expressed by[Formula: see text]The isotope effect is pressure dependent, decreasing from 1.98 at 76 cm Hg to 1.35 at 0.0178 cm Hg at 482 °C.The isotope effect and its temperature and pressure dependence are discussed in relation to the mechanism. The conclusion is reached that though trimethylene may be formed as an intermediate, the isotope effect is consistent only with an activated complex where a hydrogen atom is weakly bonded both to its original and ultimate carbon atoms, a situation which might also lead directly to propylene. A similar argument is presented to account for the previously described isotope effect in the decomposition of cyclobutane.
CONSTITUTION OF THE GALACTOMANNAN FROM THE KERNEL OF GREEN PALMYRA PALM NUT (BORASSUS FLABELLIFER LINN.)
Authors: Mukherjee A. K. , Choudhury D. , Bagchi P.
Published: May 2006

The water-soluble polysaccharide extracted from the kernel of green palmyra palm nut (Borassusflabellifer Linn.) was shown to be composed of D-galactose and D-mannose in the proportion of 1:2.4. Hydrolysis of the fully methylated galactomannan yielded 2,3,4,6-tetra-O-methyl-D-galactose, 2,3,6-tri-O-methyl-D-mannose, and 2,3-di-O-methyl-D-mannose in the molar ratio of 1:1.4:0.95. Partial hydrolysis of the galactomannan afforded 4-O-β-D-mannopyranosyl-D-mannose, 6-O-α-D-galactopyranosyl-D-mannose, and two trisaccharides. Based on these results a structural formula for the galactomannan has been proposed, additional evidence for which was adduced from periodate-oxidation studies.
RADIOIODINE EXCHANGE BETWEEN IODOSTEARIC ACID MONOLAYERS AND SUBSTRATE IODIDE. III
Authors: Ramaradhya J. M. , Robertson R. F.
Published: May 2006

Further studies have been made of the isotopic exchange reaction between monolayers at the air/water interface of I131-α-iodostearic acid and KI substrates. The dependence of the exchange velocity on substrate iodide ion concentration has been examined by employing KCl–KI mixtures of constant over-all molarity to minimize possible variations in film characteristics with substrate salt concentration. The order in substrate I− ion concentration was found to be fractional at pH 2 and indeterminate at pH 3. The velocity of exchange at all KI concentrations was increased when KCl was added to the substrate. Surface potential measurements showed α-iodostearic acid to have a negative surface potential at high molecular areas which decreased to zero as the film was compressed. The apparent negativity of the surface potential increased as salt was added to the substrate. The surface potential was found to vary with the substrate pH, passing through a maximum between pH 2 and 3. The isotopic exchange velocity and the surface potential were found to be closely related. The variation of the surface potential with time during isotopic exchange has been examined both for monolayers and for collapsed films.
REARRANGEMENT STUDIES WITH C14: XI. THE FORMOLYSIS OF 2-PHENYLETHYL-1-C14p-TOLUENESULPHONATE WITH OR WITHOUT ADDED SODIUM p-TOLUENESULPHONATE-S35
Authors: Clayton J. W. , Lee C. C.
Published: May 2006

The formolysis of 0.350 M 2-phenylethyl-1-C14p-toluenesulphonate (I) was carried out at 74 ± 0.2 °C with or without the presence of an equimolar amount of sodium p-toluenesulphonate-S35 (III). The over-all first-order rate constant, k1, was found to be 2.6 × 10−5 sec−1 and 3.0 × 10−5 sec−1, respectively, for the reaction with and without added III. The determination of the degrees of rearrangement of the C14-labeled atoms from the C-1 to the C-2 positions in the 2-phenylethyl p-toluenesulphonate (Ir) recovered from the reaction mixture at various reaction times permitted the evaluation of k14, the rate of return from ionic intermediates to covalent bonding. Using the experimental data, it was possible to calculate ks and kΔ, the rates, respectively, for the anchimerically unassisted and assisted solvolysis. As expected, formolysis of I proceeded principally by the anchimerically assisted process. Calculations also showed that the fraction of the anchimerically assisted ionization returning to covalent bonding was about 15% for the reaction in the presence of III, while in the absence of III, the return was about 9%. For the formolysis of I in the presence of III, the extents of incorporation of S35 in the recovered sulphonate Ir were also determined. The S35 incorporation in Ir, when considered in conjunction with the C14 rearrangement in Ir, led to the conclusion that the return from ionic intermediates to covalent bonding during the formolysis of I included both internal and external returns, the extent of external return being the greater of the two.
DIFFUSION OF Zn IN ZnO
Authors: Secco E. A.
Published: May 2006

not available
CONNAISSANCE DES tert-BUTYL-4 NITROMÉTHYL-1 CYCLOHEXANOLS-1 cis ET trans
Authors: Favre H. , Gravel D.
Published: May 2006

not available
STRUCTURE OF AN ARABINOGALACTAN FROM TAMARACK (LARIX LARICINA)
Authors: Haq S. , Adams G. A.
Published: May 2006

Partial acid hydrolysis of an arabinogalactan from tamarack wood yielded:(I) L-arabinose,(II) D-galactose,(III) 3-O-β-L-arabinopyranosyl-L-arabinose,(IV) 6-O-β-D-galactopyranosyl-D-galactose,(V) 3-O-β-D-galactopyranosyl-D-galactose,(VI) O-D-galactopyranosyl(1 → 6)-O-D-galactopyranosyl(1 → 6)-D-galactose,(VII) 3,6-di-O-(galactopyranosyl)-D-galactopyranose,(VIII) O-D-galactopyranosyl(1 → 3)-O-D-galactopyranosyl(1 → 3)-D-galactose,(IX) O-D-galactopyranosyl(1 → 6)-O-D-galactopyranosyl(1 → 3)-D-galactose,(X) O-D-galactopyranosyl(1 → 6)-O-D-galactopyranosyl(1 → 6)-O-D-galactopyranosyl(1 → 3)-D-galactose,(XI) O-D-galactopyranosyl(1 → 6)-O-D-galactopyranosyl(1 → 3)-O-D-galactopyranosyl(1 → 3)-D-galactose.A previously published structure for the tamarack polysaccharide was revised to show that not more than two consecutive 1 → 3 or 1 → 6 linkages respectively were present in the main core of the repeating unit. Some of the 6-O-β-D-galactopyranosyl-D-galactose units occurred as side chains as well as in the main body of the molecule.
THE CRYSTAL STRUCTURE OF 1,4-DIBROMONAPHTHALENE
Authors: Trotter J.
Published: May 2006

Crystals of 1,4-dibromonaphthalene are monoclinic with eight molecules in a unit cell of dimensions a = 27.45, b = 16.62, c = 4.09 Å; β = 91.9°; space group P21/a The high proportion of bromine in the crystal probably precludes location of the carbon atoms with sufficient precision to give accurate molecular dimensions, and it has therefore not been considered worth while proceeding beyond the detailed examination of the projection along the short c-axis. There are two molecules in the asymmetric unit, and the solution of the structure from hk0 Patterson and Fourier projections has indicated that these two molecules are related, at least in projection, by a pseudo center of symmetry. The projected bond distances indicate significant deviations of the bromine atoms from the aromatic plane. Approximate values of the bond lengths in the molecule have been deduced from the projected distances and estimated orientation angles.
THE REACTION OF BENZOYL CHLORIDE AND ETHYL BENZOATE WITH SOME ALKALI METAL SALTS OF FLUORENE
Authors: Scherf G. W. H. , Brown R. K.
Published: May 2006

In hydrocarbon or ether solvents, the sodium or potassium salt of fluorene or of 9-benzoylfluorene reacts with an equimolar amount of benzoyl chloride to form 9,1′-benzoyloxybenzylidenefluorene (I). The reaction of equimolar quantities of the lithium salt of fluorene or of 9-benzoylfluorene and benzoyl chloride in ether solvents gives rise to a mixture of 9,9-dibenzoylfluorene (II) and 9,1′-benzoyloxybenzylidenefluorene (I), but in hydrocarbon solvents produces only 9,9-dibenzoylfluorene (II).Only 9-benzoylfluorene is isolated from the reactions of the monometal salts of fluorene or of 9-benzoylfluorene with ethyl benzoate.
THE OXIDATION OF NITRITE AND IODATE IONS BY HYPOCHLORITE IONS
Authors: Lister M. W. , Rosenblum P.
Published: May 2006

The oxidation of nitrite ions and of iodate ions by hypochlorite ions in aqueous solution has been examined. The oxidation of nitrite is really a reaction of hypochlorous acid, with the slow stage HOCl + NO2− + H2O → H3O+ + Cl− + NO3−. The rate constant is given by log k = 7.36−6450/RT (time in minutes, and the activation energy in calories). The oxidation of iodate is chiefly a reaction of hypochlorite ions, probably ClO− + IO3− → Cl− + IO4−, although the rate is somewhat increased by a higher concentration of hydroxide ions. The rate constant is given by log k = 16.15−26,100/RT. These results are compared with other oxidations by hypochlorite ions, to see if any general trends are apparent.
SULPHONIUM SALT SOLVOLYSIS: PART II. COMMON-ION EFFECT AND THE ION-PAIR MECHANISM IN THE SOLVOLYSIS OF DIMETHYL-t-BUTYL SULPHONIUM SALTS
Authors: Hyne J. B. , Abrell J. W.
Published: May 2006

The kinetic effect of added common anion in the solvolysis of dimethyl-t-butyl sulphonium halides in ethanol–water mixtures is analyzed in terms of a mechanism involving solvolysis through an ion-pair intermediate. The simple ion-pair role, however, does not account for the kinetic behavior at higher added common-anion concentrations. A normal salt effect and further involvement of the ion pair in SN2 attack by common anion are compared as possible explanations for the observed kinetic behavior.
THE VELOCITY OF RATE-CONTROLLING SURFACE DIFFUSION REACTIONS IN THE ELECTRODEPOSITION OF METALS AS A FUNCTION OF DISLOCATION DENSITY
Authors: Kita H. , Enyo M. , Bockris J. O'M.
Published: May 2006

The rate constant for the surface diffusion velocity of Cu adions in the deposition of Cu appears to depend on the current density of measurement. An interpretation is suggested in which it is proposed that the number of growth sites during the deposition of Cu under "monolayer" conditions depends upon potential, owing to the dependence of the critical radius for growth upon supersaturation. Calculations based upon this hypothesis are compared with experiment. The dependence of the shape of the Tafel relation in metal deposition (transient conditions) is related to the effect of changing the number of "active" growth sites.
AN EXTRACELLULAR POLYSACCHARIDE FROM GIBBERELLA FUJIKUROI (FUSARIUM MONILIFORME)
Authors: Siddiqui I. R. , Adams G. A.
Published: May 2006

Growth of Gibberellafujikuroi (Fusariummoniliforme) on a glucose medium produced au extracellular polysaccharide containing D-glucose, D-mannose, D-galactose, D-glucuronic acid (molar ratio 1.0:1.1:1.3:0.6), and possibly D-mannuronic acid. Protein was retained tenaciously by the polysaccharide and several deproteinization methods reduced the nitrogen content only slightly. Methylation studies showed that the polysaccharide was highly branched with D-glucose and D-mannose forming the non-reducing ends in the molecule. Most of the D-mannose and D-galactose units were joined by 1 → 2 and 1 → 6 linkages with some branching also at C2and C6positions; D-galactose occurred exclusively in the furanose form. D-Glucose units were joined by 1 → 2 and 1 → 3 linkages. The D-glucuronic acid residues were mainly non-terminal and were attached to both D-galactose and D-mannose units. Periodate oxidation studies supported the foregoing conclusions.
THE REDUCTION OF NITROBENZENE BY SODIUM SULPHIDE IN AQUEOUS ETHANOL
Authors: Cope O. J. , Brown R. K.
Published: May 2006

The reduction of nitrobenzene by sodium sulphide in aqueous ethanol has been examined. Hydrosulphide and hydrodisulphide ions give rise to quite similar, though slow, rates of reduction. Sulphide ion appears to be two to three times as effective as the hydrosulphide ion. Both the sulphide and hydrosulphide species are considered to be responsible for the initial, very slow reduction with possibly some contribution from traces of polysulphide ions. The reduction is markedly accelerated by the addition of elemental sulphur to form di- and polysulphide, a much more reactive reducing species. The formation of "active" elemental sulphur during the course of the reduction produces disulphide and thus gives rise to an autocatalytic reaction. Some of this elemental sulphur is lost as thiosulphate by reaction with hydroxyl ions produced by the reduction itself, and by hydrolysis of sulphide and disulphide ions. The addition of base increases the rate of reduction due to a shift in the equilibria [Formula: see text] but this is offset somewhat by greater loss of the active elemental sulphur as thiosulphate, thus decreasing the autocatalytic acceleration of rate.Although, from its absorption at 265 mμ, nitrobenzene concentration could be accurately measured, no satisfactory method was found for estimating the concentration of disulphide ions during the course of the reduction.
SAPONINS AND SAPOGENINS: XI. ON THE PRESENCE OF ECHINOCYSTIC ACID AND QUERCETIN IN FLOWERS OF ALBIZZIA LEBBEK BENTH.
Authors: Varshney I. P. , Khan Mohd. S. Y.
Published: May 2006

not available
PREPARATION OF UNDECENOL AND UNDECENYL BROMIDE
Authors: Diaper D. G. M.
Published: May 2006

not available
A RECORDING GLASS SPIRAL MANOMETER
Authors: Edgecombe F. H. C. , Jardine D. A.
Published: May 2006

not available
AMINO ACID DISTRIBUTION IN BIOLOGICALLY ACTIVE PEPTIDES: II. DIPEPTIDES HAVING LOW STATISTICAL SIGNIFICANCE
Authors: Needleman Saul B.
Published: May 2006

not available
DECARBOXYLATION OF AROMATIC CARBOXYLIC ACIDS IN ISOTOPIC STUDIES
Authors: Fisher F. B. , Bourns A. N.
Published: May 2006

not available
THE POTASSIUM SALTS OF FUMARIC ACID: PREPARATION, UNIT CELL CONSTANTS, SPACE GROUPS, AND X-RAY DIFFRACTION POWDER IDENTIFICATION DATA
Authors: Gupta M. P. , Barnes W. H.
Published: May 2006

The preparation of the three crystalline potassium salts of fumaric acid, "acid" potassium hydrogen fumarate (2KHC4H2O4.H2C4H2O4), potassium hydrogen fumarate (KHC4H2O4), and dipotassium fumarate dihydrate (K2C4H2O4.2H2O), is discussed, and suitable pH values for the growth of single crystals of each are given. Unit cell, space group, and X-ray diffraction powder identification data for the three salts are presented.
ON THE SOLUBILITY OF ANHYDROUS CALCIUM SULPHATE AND OF GYPSUM IN CONCENTRATED SOLUTIONS OF SODIUM CHLORIDE AT 25 °C, 30 °C, 40 °C, AND 50 °C
Authors: Bock E.
Published: May 2006

The solubilities of anhydrous CaSO4 and CaSO4.2H2O in concentrated aqueous solutions of NaCl at a series of temperatures—25 °C, 30 °C, 40 °C, and 50 °C, have been determined. It was found that the transition temperature for the reaction[Formula: see text]which in pure water has a value of 42 °C, is shifted progressively to lower temperatures with increasing NaCl concentration. It was also found that the variation of the transition temperature with NaCl concentration could be adequately represented by the equation[Formula: see text]where ΔG, ΔH, and ΔS are the Gibbs free energy, enthalpy, and entropy of the reaction and P0 and P are the vapor pressures of pure water and the solution respectively at the absolute temperature T.
THE RELATIVE BASICITIES OF WATER, METHANOL, AND ETHANOL
Authors: Newall C. E. , Eastham A. M.
Published: May 2006

From the kinetics of the reaction of ethylene oxide with aqueous ethanol and methanol, catalyzed by perchloric acid, the relative basicities of water, methanol, and ethanol have been determined. The value of K1 in the expression[Formula: see text]has been found to be 1.2 × 102 for methanol and 2.1 × 102 for ethanol, in good agreement with previous values.
THE PREPARATION OF SOME MERCAPTO MONOSACCHARIDES
Authors: Jamieson N. C. , Brown R. K.
Published: May 2006

Methyl 4,6-O-benzylidene-2-benzylthio-2-deoxy-α-D-altropyranoside and methyl 4,6-O-benzyldene-3-benzylthio-3-deoxy-α-D-altropyranoside have been prepared by the reaction of sodium benzylmercaptide with methyl 2,3-anhydro-4,6-O-benzylidene-α-D-allopyranoside and methyl 2,3-anhydro-4,6-O-benzylidene-α-D-mannopyranoside respectively.These two thio ethers were successfully reduced by sodium in liquid ammonia to methyl 2-deoxy-2-mercapto-α-D-altropyranoside and methyl 3-deoxy-3-mercapto-α-D-altropyranoside. An attempted replacement of the tosyl group in 1,2;5,6-di-O-isopropylidene-3-O-tosyl-α-D-glucofuranose by benzyl mercaptan was unsuccessful.
THE LUMINESCENCE OF COMPLEX MOLECULES IN RELATION TO THE INTERNAL CONVERSION OF EXCITATION ENERGY: PART III. THE TOTAL EMISSION SPECTRA OF 1-NAPHTHOIC ACID
Authors: Hochstrasser Robin M.
Published: May 2006

After excitation by 3130-Å light the anion of 1-naphthoic acid in ethanol solution internally converts to the triplet form of the acid. The excited-state equilibrium can be shifted by the addition of a base or an acid. Numerous total emission spectra of 1-naphthoic acid in various solvents can be understood in terms of some well-established principles governing non-radiative energy transfer processes within and between complex molecules.No quantitative equilibrium studies are presented. The results indicate that the lowest excited states of the acid, singlet and triplet, are of π,π* character. The lowest excited singlet state of the anionic form is most probably n,π*, while the lowest triplet level is π,π*.
THE ALKALOIDS OF CORYDALIS GOVANIANA
Authors: Edwards O. E. , Handa K. L.
Published: May 2006

The Himalayan plant Corydalisgovaniana (Wall. Tent.) has been shown to contain the alkaloids protopine, corlumine, bicuculline, and isocorydine, as well as fumaric acid and choline.
METAL OXIDE ALKOXIDE POLYMERS: PART II. THE HYDROLYSIS OF TANTALUM PENTAETHOXIDE
Authors: Bradley D. C. , Holloway H.
Published: May 2006

The hydrolysis of tantalum pentaethoxide has been studied in boiling benzene and in boiling ethanol. Soluble tantalum oxide ethoxides were obtained over a considerable range of hydrolysis. Infrared studies suggest that Ta—OH groups are absent in these products. Ebulliometric studies have shown that the number-average degree of polymerization varies with the degree of hydrolysis in a characteristic manner and this has been quantitatively explained in terms of fundamental structural models based on octahedrally 6-co-ordinated tantalum.
A SIMPLE REAGENT FOR THE SPECIFIC DEHYDRATION OF TERPENE ALCOHOLS
Authors: Rudloff E. von
Published: May 2006

not available
SURFACE EXCHANGE REACTIONS OF SILVER AND ITS IONS
Authors: Sandor J. E.
Published: May 2006

The exchange reactions between silver and its ions in solution have been investigated by the use of radioactive tracers. Silver of highest purity was cleaned carefully and immersed into a radioactive silver nitrate solution. The course of the early absorption process and subsequent diffusion of the ions into the interior of the metal was followed in detail, and the diffusion coefficient at room temperature was calculated. The penetration depth was determined by controlled electropolishing of the metal, and the reverse movement of active ions from the metal into inactive solutions was also observed.
DESIGN AND CALIBRATION OF AN INEXPENSIVE FREE-FLOW ELECTROVISCOMETER
Authors: Maine P. A. D. de , Russell E. R.
Published: May 2006

Here are reported the design and calibration of a new inexpensive free-flow electroviscometer for rapid and accurate measurement of the viscosity coefficients for conducting and non-conducting solutions. Flow times of 30 seconds are easily reproduced to within 0.02 second.
RADICAL RECOMBINATION REACTIONS: PART II. TRIFLUOROMETHYL AND HEPTAFLUORO-n-PROPYL RADICALS
Authors: Pritchard G. O. , Miller G. H. , Dacey J. R.
Published: May 2006

Mixtures of hexafluoroacetone and perfluoro-di-n-propyl ketone were photolyzed, and the ratio of the rates of formation of the three fluorocarbons, [Formula: see text]was found to equal 1.77 ± 0.10 over a 107° temperature range.
DEUTERIUM KINETIC ISOTOPE EFFECTS: V TEMPERATURE DEPENDENCE OF β-DEUTERIUM EFFECTS IN WATER SOLVOLYSIS OF ISOPROPYL COMPOUNDS
Authors: Leffek K. T. , Robertson R. E. , Sugamori S. E.
Published: May 2006

The secondary β-deuterium isotope effect (kH/kD) has been measured over a range of temperature for the water solvolysis reactions of isopropyl methanesulphonate, p-toluenesulphonate, and bromide. In these cases the isotope effect is due to a difference in entropies of activation of the isotopic analogues rather than a difference in the enthalpies of activation. It is suggested that the observed isotope effect is due to internal rotational effects of the methyl groups in the isopropyl radical, and the lack of an isotope effect on the enthalpy of activation is accounted for by a cancellation of an effect from this source and one from zero-point energy.
THE CHEMISTRY OF ALUMINUM-NITROGEN COMPOUNDS: I. REACTIONS OF TRIMETHYLALUMINUM AND TRIMETHYLALUMINUM TRIMETHYLAMINE WITH SEVERAL METHYLHYDRAZINES
Authors: Fetter Neil R. , Bartocha Bodo
Published: May 2006

The reactions of trimethylaluminum and trimethylaluminum trimethylamine with various methylhydrazines have produced a number of complexes and polymers: with methylhydrazine, both Me3Al and Me3Al:NMe3 produce the polymer [—MeAlNHNMe—]n with 1,2-dimethylhydrazine, both produce the polymer [—Al(MeNNMe)1.5—]n; with 1,1-dimethylhydrazine, Me3Al produces [Me2Al—NHNMe2]2 and Me3Al:NMe3 produces the unusual complex Me2Al(NHNMe2) (NH2NMe2); with trimethylhydrazine, Me3Al produces [Me2Al—NMeNMe2]2 and Me3Al:NMe3 produces an isomer with the same formula but an as-yet-uncharacterized structure. In addition, the intermediate Me3Al:NHMeNMe2 has been isolated from the reaction of either Me3Al or Me3Al:NMe3 with trimethylhydrazine. With tetramethylhydrazine, Me3Al produces Me3Al:NMe2NMe2. The formation of the complexes with covalent aluminum–nitrogen bonds is specific and methane is the only gas eliminated during these reactions.
VIBRATIONAL SPECTRA OF PYRIDINIUM SALTS
Authors: Cook Denys
Published: May 2006

The vibrational spectrum of the pyridinium ion, C5H5NH+, and the N-deuterated species has been studied in several pyridinium salts. By comparison with benzene and deuterobenzene (with which the pyridinium ion is isoelectronic) a fairly complete assignment has been made. The N—H bonds, which are hydrogen bonded to the anions, have stretching vibrations which show systematic variations depending on the nature of the anion. The N—H in-plane deformation vibrations show little variation while the out-of-plane deformation vibrations, some of which do vary, are probably affected, in addition, by other factors.
LYCOPODIUM ALKALOIDS: X. THE STRUCTURE OF LYCOPODINE
Authors: Harrison W. A. , Curcumelli-Rodostamo M. , Carson D. F. , Barclay L. R. C. , MacLean D. B.
Published: May 2006

The reactions leading to the establishment of structure I for lycopodine are discussed. Structures are proposed for three cyclization products derived from lycopodine.
PARALYTIC SHELLFISH POISON: VIII. SOME CHEMICAL AND PHYSICAL PROPERTIES OF PURIFIED CLAM AND MUSSEL POISONS
Authors: Schantz Edward J. , Mold James D. , Howard William L. , Bowden John P. , Stanger D. Warren , Lynch Joseph M. , Wintersteiner Oskar P. , Dutcher James D. , Walters David R. , Riegel Byron
Published: May 2006

Mild reduction of purified clam and mussel poisons with hydrogen yielded a nontoxic dihydro derivative. The poisons and the dihydro derivative showed no absorption in the ultraviolet but all absorbed in the infrared at 3, 6, and 9 μ. Mild oxidation of the poisons in alkaline solution produced nontoxic products with strong absorption in the ultraviolet. Preliminary studies on oxidation with permanganate or periodate and on hydrolysis with acid yielded only small fragments such as guanidopropionic acid, urea, guanidine, ammonia, and carbon dioxide. Titration of the poisons and the dihydro derivatives showed pKa values at 8.1 and 11.5. The two poisons appear to be similar in their chemical and physical properties.
A NEW METHOD FOR THE DEOXYGENATION OF AROMATIC N-OXIDES
Authors: Abramovitch R. A. , Adams K. A. H.
Published: May 2006

not available
DIELECTRIC RELAXATION IN LIQUIDS: II. ISOMERIC PENTANEDIOLS
Authors: Davidson D. W.
Published: May 2006

For five pentanediols the infrared spectra, the dipole moments, and the static dielectric constants show an increasing degree of internal hydrogen bonding with increasing proximity of the OH groups. The dielectric dispersion loci at low temperatures are skewed arcs over most of the dispersion range. Values of the parameter β decrease from ca. 1 to 0.55 in the series 1,5-, 1,4-, 1,2-, 2,4-, and 2,3-pentanediol, which is also the order of increasing relaxation time τ0 at low temperatures. Increased τ0 is associated with increased irregularity of intermolecular hydrogen bonding, an effect which supports the view that relaxation proceeds by a co-operative mechanism which is facilitated by regularity in the liquid structure. At temperatures of "structural relaxation", values of log τ0 are linear in (T–T∞)−1; the proportionality constants, but not the T∞'s, are the same for all five diols.The experimental behavior at relatively high frequencies departs from both the skewed-arc and Glarum equations, although less from the latter. These departures are compared with the high frequency dispersion regions in n-propanol.
SOLVOLYSIS IN HYDROGEN AND DEUTERIUM OXIDE: IV. HALIDES WITH NEIGHBORING GROUPS
Authors: Laughton P. M. , Robertson R. E.
Published: May 2006

Rate data for the hydrolysis of a series of halohydrins and related compounds in light and heavy water are reported. The solvent isotope effects [Formula: see text] from these measurements fall into three groups compared with those of simple halides. Thus the presence of a hydroxyl group in proximity to the seat of reaction may lead to increased, decreased, or normal solvent isotope ratios. The abnormal ratios can be interpreted in terms of the effect of anchimeric assistance on the solvation shell in the activation process.
THE RAMAN SPECTRA OF LIQUID SULPHUR TRIOXIDE AND SOLUTIONS OF SULPHUR TRIOXIDE IN INERT SOLVENTS
Authors: Gillespie R. J. , Robinson E. A.
Published: May 2006

The Raman spectra of liquid sulphur trioxide and of sulphur trioxide dissolved in a number of "inert" solvents have been investigated. A detailed analysis of the spectrum of liquid sulphur trioxide supports the earlier suggestion of Gerding and Nijveld that the main polymeric species in liquid sulphur trioxide is the cyclic trimer. Frequencies are assigned for all the Raman active vibrations of the cyclic trimer. These assignments differ substantially from those given previously by Gerding and Nijveld.The spectra of dilute solutions of sulphur trioxide in sulphur dioxide, sulphuryl chloride, carbon tetrachloride, tetrachlorethylene, and trichlorfluormethane (Freon 11) show that the sulphur trioxide is present mainly in the monomeric form at low concentrations while at higher concentrations a polymeric form, which is very probably the trimer, is also present.
SOME STEREOCHEMICAL STUDIES ON α,β-UNSATURATED KETONES USING RAMAN SPECTROPHOTOMETRY
Authors: Noack K. , Jones R. Norman
Published: May 2006

The Raman spectra of 12 α,β-unsaturated open-chain and cyclic ketones have been measured in the region of the C = O and C = C stretching vibrations, and the band positions and intensities have been compared with the corresponding bands in the infrared spectra. If due allowance is made for solvent effects, the infrared and Raman bands are observed at the same positions, but the relative intensities of the C = O and C = C bands are different; in particular, the Raman C = O stretching bands of the ketones in the s-trans configuration are from 5 to 10 times more intense than the Raman bands for the s-cis isomers. The cyclic s-trans ketones with a hydrogen atom on the α-carbon atom exhibit a solvent-sensitive doubling of the carbonyl maximum similar to that noted previously for certain α,β-unsaturated lactones, unsaturated acid anhydrides, and Δ2-cyclopentenone derivatives. These doublet carbonyl maxima are observed also in the infrared spectra. The C = C frequency is not similarly perturbed and the effect is distinct from the doubling of both the C = O and the C = C bands exhibited by some open-chain α,β-unsaturated ketones that exist in the liquid phase as equilibrium mixtures of s-cis and s-trans isomers.
ASSOCIATION IN THE BINARY LIQUID SYSTEM DIMETHYL SULPHOXIDE – WATER
Authors: Cowie J. M. G. , Toporowski P. M.
Published: May 2006

The viscosities and densities of several mixtures of dimethyl sulphoxide and water have been measured at 25°, 45°, and 65 °C. Heats of mixing and refractive indices at 25 °C are also reported. The results indicate there is strong association of the two liquids which may be attributed to hydrogen bonding.
THE ALUMINUM REDUCTION OF MAGNESIUM OXIDE: II. THE VAPOR PRESSURE OF MAGNESIUM OVER THE SYSTEM Al–MgO–CaO
Authors: Grjotheim K. , Herstad O. , Toguri J. M.
Published: May 2006

The equilibrium vapor pressure of magnesium over the reaction between the calcined dolomite and aluminum was measured by means of the transportation method. In the temperature range 886–1035 °C, the reaction was found to proceed according to the equilibrium[Formula: see text]and the measured equilibrium pressure of magnesium can be expressed by the equation[Formula: see text]
THE ELECTRONIC SPECTRA OF MoCl5 AND NbCl5
Authors: Bader Richard F. W. , Westland Alan D.
Published: May 2006

The visible and ultraviolet spectra of MoCl5 and NbCl5 have been investigated in both the vapor state and solution. The number of bands observed indicates that a Jahn–Teller effect may be operative in the 2E′state of MoCl5.
THE N.M.R. SPECTRUM OF CYCLOPENTANONE
Authors: Anet F. A. L.
Published: May 2006

not available
THE EFFECTS OF OPTICALLY INACTIVE IONS ON THE ROTATORY DISPERSION OF ASYMMETRIC COMPLEX IONS
Authors: Albinak Marvin J. , Bhatnagar Dinesh C. , Kirschner Stanley , Sonnessa Anthony J.
Published: May 2006

Considerable interest in the optical rotatory dispersion of asymmetric organic and inorganic compounds and its application to the elucidation of their structures has arisen in recent years. In order to study the effects of optically inactive ions on the rotatory dispersion of asymmetric complex ions, a series of salts was prepared of two active cations: levo cis-oxalato-bis(ethylenediamine)cobalt(III) and levo tris(ethylenediamine)chromium(III). Salts prepared included the fluoride, chloride, bromide, iodide, tetrafluoroborate, perchlorate, sulphate, and phosphate. In order to study this effect on an optically active anion, the lithium, sodium, potassium, rubidium, cesium, magnesium, calcium, and barium salts of dextro and levo tris(oxalato)rhodate(III) were also prepared. Rotatory dispersion curves and absorption spectra were obtained for all salts in water solution. A comparison of the curves within a series showed definite trends in changes of wavelength and intensity of maxima of rotation and absorption with changes in both the ionic charge/size ratio (ionic potential) and polarizability of the optically inactive ions.
RADIATION CHEMISTRY OF CYCLOHEXANE: IV. PRIMARY PRODUCT YIELDS IN THE IRRADIATION OF CYCLOHEXANE
Authors: Dyne P. J. , Stone J. A.
Published: May 2006

The radiolysis of cyclohexane has been studied at low total doses and initial G values have been determined. Ninety-nine per cent of the evolved hydrogen has been accounted for in hydrogen-deficient products. Cyclohexene, bicyclohexyl, and cyclohexyl-hexene-1 have been identified as primary reaction products. Cyclohexyl-cyclohexene has been identified as a secondary reaction product. The use of high irradiation doses has been shown to lead to decreases in the initial G values of all primary products.
THE DIFFUSION OF "ATTACHED" INERT-GAS ACTIVITY
Authors: Kelly Roger
Published: May 2006

It was shown previously that, when an inert gas is irradiated with neutrons in the presence of a powdered solid, between 0.1 and 14% of the induced inert-gas activity is firmly "attached" to the solid. The manner in which attached inert-gas activity is released at temperatures between 50 and 800 °C has now been studied. Release data were assembled for a number of systems, and it was noted that the release was reproducible and apparently a diffusion phenomenon. Several theoretical treatments based on diffusion theory were then explored. Agreement between theory and observation was poor if a constant activation enthalpy was assumed. Agreement was good, on the other hand, with theory that took account of the damaged condition of the solid, and the existence of composition anomalies, in the surface region where the inert-gas activity was attached. The damage and composition anomalies were assumed to lead to a spectrum of activation enthalpies and thence to a simplified diffusive motion involving a single rate-controlling jump. The activation-enthalpy spectra for the systems Ar–Nb and Xe–Nb were found to be identical, extending from about 25 to 47 kcal. The spectrum for Xe–Nb2O5 extended from about 28 to 76 kcal, and was, in general, similar to the spectra for Xe–SiO2, Ar–TiO2, and Xe–TiO2.
THE COMPOUNDS KMnIO6 AND NaMnIO6
Authors: Reimer Ilse , Lister M. W.
Published: May 2006

Two compounds, originally formulated by Price as Na2Mn2I2O11 and K2Mn2I2O11 have been shown to be NaMnIO6•1/2H2O and KMnIO6•1/2H2O. Consequently they are compounds of tetravalent manganese, a conclusion confirmed by their magnetic susceptibilities, and by their reactions with a variety of reducing agents; the reactions with ferrous ions, iodide ions, sulphur dioxide, hydroxylamine hydrochloride, and hydrazine hydrochloride were examined. Some of the properties of these compounds are described, and their X-ray powder diagrams show them to be analogous to the nickel salts NaNiIO6•H2O and KNiIO6•1/2H2O.
REACTION OF OXYGEN ATOMS WITH BENZENE
Authors: Boocock G. , Cvetanović R. J.
Published: May 2006

The reaction of benzene with oxygen atoms produced by mercury photosensitized decomposition of nitrous oxide has been studied in a circulating system at room temperature. The main reaction product is a non-volatile material probably largely aldehydic in character. This is tentatively assumed to result from the rearrangement and polymerization of the initially formed adduct. Smaller amounts of phenol and carbon monoxide are also formed. The rate of formation of carbon monoxide decreases with increasing pressure, suggesting an energy-rich precursor.Oxygen atoms react with benzene much more slowly than with olefines. At 120° cyclopentene reacts about 150 times more quickly than benzene. The activation energy of the reaction of oxygen atoms with benzene has been estimated at 4.6 to 4.9 kcal/mole, with an uncertainty of about 0.7 kcal/mole.
REACTION OF OXYGEN ATOMS WITH TOLUENE
Authors: Jones G. R. H. , Cvetanović R. J.
Published: May 2006

The reaction of toluene with oxygen atoms produced by mercury photosensitized decomposition of nitrous oxide has been studied at room temperature. The reaction shows a general similarity to the corresponding reaction of benzene. Relative rates have been determined at 120 and 220 °C and the activation energy estimated at close to 4 kcal/mole.
PREFERRED RESIDENCE CONFORMATIONS OF DIASTEREOISOMERIC α–β AMINO ALCOHOLS: AN N.M.R. STUDY OF THE EPHEDRINES
Authors: Hyne J. B.
Published: May 2006

Nuclear magnetic resonance spectral results including chemical shifts, anisotropy effects, spin coupling constants, and hydrogen bonding phenomena are presented for the diastereoisomeric pair of α–β amino alcohols (−)-ephedrine and (+)-Ψ-ephedrine. The results are shown to be in keeping with the existence of a preferred residence conformation for each of the diastereoisomers.
HALOGEN ATOM REACTIONS: I. THE ELECTRICAL DISCHARGE AS A SOURCE OF HALOGEN ATOMS
Authors: Ogryzlo E. A.
Published: May 2006

A number of surface poisons have been found to prevent the rapid recombination of chlorine, bromine, and iodine atoms. Hence these atoms can now be obtained in large concentrations in a flow system.A chemical titration procedure for both Cl and Br atoms has been developed and has been used to test an isothermal calorimetric detector which can measure the atom concentration along a reaction tube. The detector was used to establish the surface recombination coefficient (γ) for chlorine atoms (4 × 10−5) and bromine atoms (6 × 10−5) on oxyacid-covered surfaces.
THE CHEMICAL COMPOSITION OF THE WOOD AND BARK EXTRACTIVES OF JUNIPERUS HORIZONTALIS MOENCH
Authors: Narasimhachari N. , Rudloff E. von
Published: May 2006

The wood of creeping juniper was found to contain about 10% acetone-soluble material. Of this, about one quarter was ligroin soluble and, from this portion, thujopsene, α-cedrene, cuparene, cedrol, widdrol, β-sitosterol, esters of fatty acids and β-sitosterol, the lignan savinin, and the recently discovered diterpene communic acid were isolated. Three unidentified hydrocarbons and several unknown alcohols and ketones were also obtained in small amounts. The ether-insoluble portion consisted of intractable polyphenolic material. The composition of the ligroin-soluble extract of the bark of this shrub resembled that of the wood in many respects. Neither the wood nor the bark extractives contained thujaplicins in detectable amounts.
THE PREPARATION OF ERYTHRO-3-PENTULOSE
Authors: Stoodley R. J.
Published: May 2006

The mercuric acetate oxidation of ribitol yielded a mixture of erythro-3-pentulose and DL-erythro-2-pentulose.
CRYSTAL DATA FOR DIPHENYLARSENICALS
Authors: Cullen W. R. , Trotter J.
Published: May 2006

not available
METAL OXIDE ALKOXIDE POLYMERS: PART III. THE HYDROLYSIS OF SECONDARY AND TERTIARY ALKOXIDES OF ZIRCONIUM
Authors: Bradley D. C. , Carter D. G.
Published: May 2006

The hydrolysis of zirconium alkoxides with secondary or tertiary alkoxide groups Zr(OR)4, where R = Pri, Bus, Bul, and Amt, has been studied. The relatively low polymers formed by the metal oxide alkoxides have been interpreted on the basis of structural models involving octahedrally 6-co-ordinated zirconium.
THERMOCHEMICAL STUDIES OF SOME ALCOHOL–ISOCYANATE REACTIONS
Authors: Lovering Edward G. , Laidler Keith J.
Published: May 2006

The heats of reaction of normal-, iso-, and secondary-butyl alcohols reacting with phenyl isocyanate, the three tolyl isocyanates, and 2,4-tolylene diisocyanate were measured at 25 °C, using a differential calorimeter of the Tian–Calvet type. The results are interpreted in terms of substituent effects.From bond energy considerations the heats of formation of phenyl isocyanate and tolyl isocyanate have been estimated.
THE SOLUBILITY OF BERYLLIUM OXIDE IN AQUEOUS BERYLLIUM SULPHATE SOLUTIONS
Authors: Bennett S. L. , Biermann W. J.
Published: May 2006

It is observed that ignited beryllium oxide was soluble in concentrated aqueous solutions of beryllium sulphate to the extent of 1 mole of oxide per 2 moles sulphate, saturation being virtually complete within 6 hours at 80 °C. Since the molar solubility of aluminum oxide is much lower under similar conditions, it is suggested that partial resolution of oxide mixtures might be made on this basis.
THE DIELECTRIC BEHAVIOR AT LOW TEMPERATURES OF SEVERAL GASES ADSORBED UPON POROUS VYCOR GLASS
Authors: Chapman I. D. , McIntosh R.
Published: May 2006

The complex dielectric constants of several systems comprising a gas adsorbed on Vycor glass have been measured at temperatures between 0 °C and −180 °C and frequencies between 3 kc/sec and 4 Mc/sec. The real and imaginary parts of the dielectric constant of the adsorbed phase have been computed. Loss maxima occurring at low temperatures are observed for some of the matter in the monolayer and are assumed to be due to complexes formed between the gas first admitted and hydroxyl groups which are covalently attached to the surface of the glass. The complexes may be considered either as dipoles having two equilibrium positions, or as highly damped oscillators. Ethyl chloride adsorbed in the first molecular layer and not bonded to OH behaves as an oscillatory system for which no loss is observed in the frequency and temperature ranges studied. Ethyl chloride adsorbed in the multilayers behaves similarly but shows a slightly greater temperature coefficient of ε′. Both these types of adsorbed ethyl chloride interact with the complexes and reduce the threshold temperature at which loss is observed in the complex. Methyl chloride interacts with OH groups in a similar fashion, but n-butane does not.
AMINO NITRILES: III. REACTION OF AMINO NITRILES WITH ISOTHIURONIUM SALTS
Authors: Kreling M.-E. , McKay A. F.
Published: May 2006

N-Substituted-N′,N″-di-(2-cyanoethyl)-guanidines have been cyclized with the elimination of acrylonitrile to 2-imino-3-substituted-4-keto-hexahydropyrimidines. These pyrimidine derivatives also were prepared by treating 1-substituted-3-(2-cyanoethyl)-S-methyl isothiuronium iodide salts with ammonia. 1-(3,4-Dichlorobenzyl)-3-(2-cyanoethyl)-urea was cyclized in the presence of absolute ethanolic hydrogen chloride to 2,4-diketo-3-(3,4-dichloro-benzyl)-hexahydropyrimidine.
THE ENZYMIC SYNTHESIS OF 3-O- AND 6-O-β-D-GALACTOPYRANOSYL-D-GALACTOSE
Authors: Stephen A. M. , Kirkwood S. , Smith F.
Published: May 2006

not available