bluuebunny/crossref_metadata_2025_split huggingface dataset:
The photolysis of Cyclopropanecarbaldehyde at 254 nm
Authors: Overwater J. J. I. , Cerfontain H. 
Published: September 2010

AbstractCyclopropanecarbaldehyde has been photolyzed in the gas phase with light in the 254 nm region. The most important gaseous products are carbon monoxide, ethene, propene and cyclopropane.The quantum yield of propene, which is almost independent of temperature, decreases with increasing aldehyde pressure but increases with increasing intensity of the absorbed light. The ratio of the yields of ethene and propene is independent of aldehyde pressure and absorbed light intensity, but increases with increasing temperatures. The quantum yield of cyclopropane increases both with increasing temperatures and increasing aldehyde pressure, but decreases with increasing absorbed light intensity.It is suggested that ethene and propene are formed by intramolecular decomposition from the same singlet excited state, whereas cyclopropane results from a radical decomposition of triplet aldehyde. The influence of the absorbed light intensity on the quantum yields of the gaseous products is explained in terms of triplet‐triplet annihilation.
Synthesis of 3,5‐Dihydroxy‐2‐Methyl‐5,6‐Dihydropyran‐4‐one from Aldohexoses and Secondary Amine salts
Authors: van den Ouweland G. A. M. , Peer H. G. 
Published: September 2010

Abstract3,5‐Dihydroxy‐2‐methyl‐5,6‐dihydropyran‐4‐one was prepared in reasonable yield from D‐glucose and piperidine salts. Of the possible mechanisms, experimental evidence favours that involving conversion of the resulting aldosylamine into the enol of the corresponding aminodeoxyketose (Amadori rearrangement), followed by 1,4‐elimination of amine from this enol and subsequent acid‐catalysed cyclization.
The s‐trans‐conformation of 2‐thienyl‐carbonyl compounds
Authors: Kaper L. , de Boer Th. J. 
Published: September 2010

Abstract2‐Thienyl‐carbonyl compounds occur exclusively in the s‐trans conformation as follows from NMR solvent shifts, temperature dependence of NMR spectra and nuclear Overhauser effects (NOE) as observed in some appropriately substituted 2‐thienyl‐carbonyl compounds. IR spectra are also in agreement with one (s‐trans) conformation.
Adducts of thiophosphoryl compounds with metal halides. Part III: Addition compounds of phosphoryl bromide and thiophosphoryl bromide
Authors: van der Veer W. , Jellinek F. 
Published: September 2010

AbstractThe addition compounds Br3PS · AlBr3, Br3PS · SbCl5 and Br3PS · SO3 were prepared and their thermal decomposition studied. The adduct Br3PS · AlCl3, unstable at room temperature, was found as an intermediate in the reaction of AlBr3 with PSCl3. The first steps of the decomposition of Br3PS · SbCl5 involve exchange of the halogens between P and Sb; finally, PSCl3, SbCl3, SbBr3 and bromine are formed. The decomposition of Br3PS · SbCl5 at elevated temperatures, however, gives PCl5 · SbCl5, SbBr3, PSBr3 and sulfur. Br3PS · SO3 decomposes at 10° to SO2, POBr3 and sulfur. The adducts Br3PO · AlBr3, Br3PO · 3 AlCl3, Br3PO · AlCl3, Br3PO · SbCl5, (Br3PO)2SbCl3, (Br3PO)2SbBr3, (Br3PO)2FeBr2, and Br3PO · 2 SO3 (?) were also prepared‐most of them for the first time‐and their thermal decomposition studied. Infrared spectra of the adducts of PSBr3 and POBr3 with metal halides show that the sulfur (or oxygen) atom is coordinated with the metal.
Studies on polypeptides. Part VIII: Synthesis of L‐ and D‐2,6‐diamino‐4‐hexynoic acid
Authors: Jansen A. C. A. , Kerling K. E. T. , Havinga E. 
Published: September 2010

AbstractL‐ and D‐2,6‐Diamino‐4‐hexynoic acid were obtained in good yield by acylase I resolution of DL‐2,6‐diacetylamino‐4‐hexynoic acid. The latter compound was synthesized from 1,4‐dichloro‐2‐butyne via 1‐acetylamino‐4‐chloro‐2‐butyne and ethyl 2,6‐diacetylamino‐2‐ethoxycarboxyl‐4‐hexynoate. Catalytic hydrogenation of the title compounds yielded pure L‐ and D‐lysine. These analogues of lysine can be useful in the synthesis of 4,5‐deuterated or tritiated L‐ and D‐lysine.
Studies on polypeptides. Part XI: Fragment condensation by azide coupling with a polymer‐bound peptide. The synthesis of 1‐13[10‐Citrulline, 13‐Leucine] bovine pancreatic ribonuclease
Authors: Visser S. , Kerling K. E. T. 
Published: September 2010

AbstractAll‐L‐Nα, Nϵ‐di‐tbutoxycarbonyllysyl‐γ‐t‐butylglutamylthreonylalanylalanylalanyl‐Nϵ‐benzyloxycarbonyllysylphenylalanine azide was coupled to all‐L‐γ‐t‐butylglutamylcitrullylglutaminyl‐Nim‐benzyl histidylleucine bound on a solid support. The tridecapeptide obtained upon cleavage from the resin with hydrogen bromide in trifluoroacetic acid contained only a few percent of unreacted penta‐peptide and could easily be purified by gel‐filtration. No product resulting from a rearrangement of the azide to the isocyanate, followed by condensation with the pentapeptide‐resin, could be detected. Removal of the imidazole protecting group yielded the N‐terminal tridecapeptide of bovine pancreatic ribonuclease in which the arginine‐10 and the methionine‐13 residues have been replaced by citrulline and leucine, respectively.
Polynuclear heterocyclic systems: Part VII. Addition of dimethyl azodiformate to 1‐arylcycloalkenes
Authors: Willems A. G. M. , van Eck R. Ritsema , Nijhuis H. , Pandit U. K. , Huisman H. O. 
Published: September 2010

AbstractThe reaction of dimethyl azodiformate with 1‐phenylcyclopentene, 1‐phenylcyclohexene, 1‐(2‐naphthyl)cyclopentene, 1‐(2‐naphthyl)cyclohexene, 1‐(6‐methoxy‐2‐naphthyl)cyclopentene and 1‐(6‐methoxy‐2‐naphthyl)cyclohexene gives 2: 1 (ester‐olefin) adducts. The reaction mechanism of adduct formation is discussed.
The synthesis of 1‐tosylalkyl isocyanates and N(1‐tosylalkyl)carbamoyl chlorides from S‐ethyl N‐(1‐tosylalkyl) thiocarbamates
Authors: Olijnsma T. , Engberts J. B. F. N. , Strating J. 
Published: September 2010

Abstract1‐Tosylalkyl isocyanates, p‐CH3C6H4SO2CHRNCO (II), have been prepared in good yields from the reaction of S‐ethyl N‐(1‐tosylalkyl)thiocarbamates (I) and chlorine in a heterogeneous mixture of dichloromethane and aqueous sodium hydrogen carbonate. The reaction probably involves the intermediate formation of the previously unreported N‐(1‐tosylalkyl)carbamoyl chlorides, p‐CH3C6H4SO2CHRNR′COCl (IV), which may be isolated in high yield under anhydrous reaction conditions. In mildly alkaline solutions, these carbamoyl chlorides (R′  H) are smoothly converted into the 1‐tosylalkyl isocyanates. Ethanesulfonyl N‐methyl‐N‐(tosylmethyl)formamide (V), obtained by oxidation of S‐ethyl N‐methyl‐N‐(tosylmethyl)thiocarbamate, p‐CH3C6H4SO2CH2N(CH3)C(O)SC2H5, with hydrogen peroxide in acetic acid, was treated with chlorine to give tosyl chloride and ethanesulfonyl chloride. α‐Oxosulfones, p‐CH3C6H4SO2CH2N(CH3)C(O)SO2C2H5, are therefore unlikely intermediates in the formation of N‐(1‐tosylalkyl)carbamoyl chlorides.The reaction of S‐ethyl N‐(1‐tosylalkyl)thiocarbamates (I) with bromine in CH2Cl2/NaHCO3‐H2O in the presence of methanol gives methyl N‐(1‐tosylalkyl) carbamates, a result which can be best interpreted by assuming 1‐tosylalkyl isocyanates as intermediates.
The structure of the reduction product of the head‐to‐head photodimer of isophorone
Authors: Koning R. E. , Visser G. J. , Vos Aafje 
Published: September 2010

AbstractAn X‐ray diffraction study of the reduction product of the head‐to‐head photodimer of isophorone has shown that the six‐membered rings are in anti position relative to the four‐membered ring.
Functionalized enamines. Part VII: Reaction of dienamines with arenediazonium salts; Synthesis of 6,7‐diaza‐D‐homoequilenin methyl e her
Authors: Pollmann M. J. M. , Reus H. R. , Pandit U. K. , Huisman H. O. 
Published: September 2010

AbstractThe reaction of the dienamine (1) from 8a‐methyl‐1,6‐dioxo‐1,2,3,4,6,7, 8,8a‐octahydronaphthalene, with arenediazonium salts, has been investigated. Depending upon the solvent, β‐ as well as δ‐substituted products are obtained. A rationalization for this substitution pattern is proposed. The β‐substituted product, obtained upon reaction of 1 with m‐methoxybenzenediazonium fluoroborate, has been converted into 6,7‐diaza‐D‐homoequilenin methyl ether (13) in two simple steps.
Functionalized enamines. Part IX: Synthesis of fused furan systems via reaction of conjugated enamines with α‐halogenoketones
Authors: Pandit U. K. , Reus H. R. , de Jonge K. 
Published: September 2010

AbstractReaction of conjugated enamines with α‐bromoketones leads to the formation of substituted furans in one practical step. The reaction has been applied to the synthesis of steroido[3,4‐b]furans.
The molecular and crystal structure of an 11,13‐diaza‐estrone methyl ether hydrobromide
Authors: Joustra Anneke H. , Schenk H. 
Published: September 2010

AbstractThe crystals of a di‐aza steroid (C16H19N302 · HBr) which turned out to be 12‐amino‐11,13‐diaza‐9β, 14β‐11,12‐dehydroestrone methyl ether hydro‐bromide are monoclinic with cell dimensions a = 10.632, b = 10.667, c = 14.277 Å and β = 105.47°. The space group is P21/n. Z = 4. The hydrogen atoms of the asymmetric carbon atoms are all situated at the same side of the steroidal plane. This results in a cis‐coupling of the B/C junction. The B‐ and C‐rings are half chairs and the D‐ring is a Cs(15)‐envelope.
Nuclear magnetic resonance determination of association constants of electron donor — acceptor complexes: The effect of reference standards and the behaviour of mixed donors: (Short communication)
Authors: Foster R. , Twiselton D. R. 
Published: September 2010

Abstract[1] It is shown experimentally that, for both 1H and 19F resonances, determinations of association constant can be independent of the reference standard.[2] Mixtures of benzene and mesitylene behave in a simple additive manner in the presence of the electron‐acceptor fluoranil. This is analogous to the predicted behaviour of isomeric 1: 1 complexes formed between a single‐donor species with an acceptor in solution.
Addition of hydrogen halide to 1‐alkynylphosphines: Kinetics and mechanism
Authors: Borkent G. , Drenth W. 
Published: September 2010

AbstractAddition of one molecule of hydrogen halide to the triple bond of 1‐alkynyl‐phosphines in aqueous solution is a trans reaction the rate of which is proportional to the activity of the halide ions. Rates of addition of HCl and DCl are approximately equal. The rate determining step involves addition of halide ion to protonated 1‐alkynylphosphine.
Ligand hyperfine structure in the EPR‐spectrum of the fluorochromyl(V)‐, and fluorotungstenyl(V)‐ions
Authors: van Kemenade J. T. C. 
Published: September 2010

AbstractEPR spectra of the ions CrOF−5, MoOF−5 and WOF−5 in single crystals of suitable diamagnetic host compounds are given. All ligand hyperfine interaction parameters are measured and compared with values obtained from frozen glass spectra. Upon substitution, the paramagnetic ions are shown to make specific selections out of the three possible crystallografically unequivalent orientations.
Chemistry and spectroscopy in strongly acidic solutions. Part XXXIV: Interconversion of secondary and tertiary alkyloxocarbonium ions by decarbonylation‐carbonylation. Free‐enthalpy diagrams
Authors: Hogeveen H. , Roobeek C. F. 
Published: September 2010

AbstractThe secondary and tertiary oxocarbonium ions C5H11CO⊕ interconvert quite readily at room temperature in FHSO3/SbF5 (1: 1 m/m) solution by a process of decarbonylation, rearrangement and carbonylation. Consequently, starting from any secondary or tertiary carboxylic acid C5H11COOH, after initial dehydration, the same mixture of the four isomeric secondary and tertiary C5H11CO⊕ ions is obtained. From the free enthalpy of activation of the conversion of 2‐methylbutyl‐2‐oxocarbonium ion to 2‐methylbutyl‐3‐oxocarbonium ion (ΔG‡ = 21.2 kcal· mole−1 at 20°), combined with previously obtained free‐enthalpy data, the rate of carbonylation of secondary alkylcarbonium ions is calculated to be about 3.1071· mole−1· s−1 at 20°. In this process the carbonylation of the secondary alkylcarbonium ions is the slow step in the overall reaction.The free enthalpy of activation of the conversion of sec. butyloxocarbonium ion to tert.butyloxocarbonium ion was found to be 30.4 kcal· mole−1 at 20°. Such a high value was anticipated in view of the relatively low rate of the rearrangement step sec.butyl cation → tert.butyl cation. This rearrangement is the slow step in the overall reaction.Primary alkyloxocarbonium ions do not decarbonylate at temperatures up to 100°.
An improved synthesis of 4‐imidazoleëthanol
Authors: Bloemhoff W. , Kerling K. E. T. 
Published: September 2010

AbstractAn improved preparation of 4‐imidazoleëthanol [4‐(2‐hydroxyethyl)imidazole] (I) is described. Starting from 2‐butyne‐1,4‐diol (II), 4‐(2‐methoxyethyl)imidazole (III) has been obtained, which on cleavage with hydrobromic acid gives I in satisfactory overall yield. Prolonged heating of III in hydrobromic acid gives 4‐(2‐bromoethyl)imidazole hydrobromide.
Association constants of fluoranil‐methyl‐benzene complexes from nmr chemical shift measurements
Authors: Foster R. , Twiselton D. R. 
Published: September 2010

AbstractThe association constants for a series of methylbenzene‐fluoranil electron donor‐acceptor complexes have been determined from NMR chemical shift measurements using 1: 1 stoicheiometric ratios of electron donor‐electron acceptor. The resulting values differ from those obtained when large excess concentrations of donor are used. It is suggested that the differences may be the result of the presence of significant concentrations of termolecular complexes in the latter solutions.
Conformation of non‐aromatic ring compounds. Part 68. The calculation of dihedral angles from vicinal proton coupling constants in six‐membered ring compounds. Part 2
Authors: Buys H. R. 
Published: September 2010

AbstractFor six‐membered ring compounds having a −CH2‐CH2‐ fragment for which four vicinal coupling constants follow from the NMR spectrum (ABCD type), the ratio R = (Jtrans + J′trans/(Jcis + J′cis is equated to the ring torsional angle ψ in that fragment. The ψ values calculated from experimental coupling constants of trans‐2,3‐dichloro‐1,4‐dioxane (I) and ‐oxathiane (II), 2‐p‐chlorophenyl‐1,3‐dioxane (III), 2‐phenyl‐1,3‐dithiane (IV), trimethylene sulfite (V) and 2‐oxo‐2‐phenoxy‐1,3,2‐dioxaphosphorinane (VI) show an excellent agreement with the corresponding torsional angles obtained from X‐ray diffraction data.
Complexes with ligands containing the nitro group: Part III. Metal(II) nitrobenzene solvates
Authors: Driessen W. L. , van Geldrop L. M. , Groeneveld W. L. 
Published: September 2010

AbstractSeven new complexes are reported with nitrobenzene as the ligand, viz. [M(C6H5NO2)6]2+[SbCl6]2− with M is Mg(II), Ca(II), Mn(II), Fe(II), Co(II), Ni(II), and Zn(II).No shift in the NO stretching frequencies has been observed. The NO2 out of plane bending vibration shifts to higher frequencies dependent on the metal ions.Investigation of ligand field spectra indicates the presence of octahedral species M(nitrobenzene)62+ in the solid compounds. Values for Dq and B for the Co and Ni compounds are reported.
Enthalpy of formation of liquid 1‐propanol by an improved combustion technique
Authors: Dekker H. , Mosselman C. 
Published: September 2010

AbstractThe enthalpy of formation of 1‐propanol at 298.15 K has been measured using an improved combustion technique.A value of − 302.67 ± 0.25 kJ mole−1 was found.
Trans‐substitution and equilibration of phenols: Part I. Trans‐t‐butylation of phenols in the presence of aluminum phenoxide type catalysts
Authors: Willemse F.R.J. , Wolters J. , Kooyman E.C. 
Published: September 2010

AbstractPhenols containing a free ortho‐position can be alkylated by ortho‐t‐butyl‐phenols in the presence of catalytic amounts of aluminium phenoxide at temperatures between about 120° and 170°.Using 2‐t‐butylphenol, 2,6‐di‐t‐butyl‐phenol or ‐p‐cresol as the alkylating agent, trans‐t‐butylations were carried out with the following phenolic acceptors: phenol, o‐, m‐, p‐cresol, p‐Br‐, p‐Cl‐, p‐F‐, p‐CH3O‐, p‐t‐Bu‐, p‐isoPr‐, and p‐Et‐phenol. Higher rates were observed for the more acidic phenols.The above mentioned reactions lead to equilibria of the type: 2,6‐di‐t‐butyl‐p‐Z‐C6H2OH + p‐Z‐C6H4OH ⇄ 2 2‐t‐butyl‐p‐Z‐C6H3OHThe equilibrium constant for this reaction is about 24 and independent of the substituent in the phenolic nucleus.For Z = CH3 the energy of activation has the value 36 (± 3) kcal/mole.When the 3, 4 and 5 positions are unoccupied, a slow ortho‐para isomerization takes place along with ortho‐trans‐t‐butylation.The equilibrium between 2‐t‐butylphenol and 4‐t‐butylphenol lies far towards the thermodynamically more stable para‐isomer, the ortho‐isomer however is kinetically more favourable. Meta‐isomers are formed under these conditions to a small extent and only after long reaction times.At temperatures above 140° some dealkylation occurs with formation of isobutene.Both 3,5‐dimethylphenol and 2‐methoxyphenol failed to accept t‐butyl‐groups.
Investigations on sterols XXXVII: New routes to 9,10‐isomers of 6‐dehydroprogesterone
Authors: Rappoldt M.P. , Rix T.H.R. 
Published: September 2010

AbstractThe synthesis of 6‐dehydro‐9β, 10α‐progesterone (IV) from progesterone via irradiation of 3,20‐bis(ethylenedioxy)pregna‐5,7‐diene (II) is described. An analogous synthesis has been accomplished via 3‐(ethylenedioxy)pregna‐5,7‐dien‐20‐one (VI).Pyrolysis of the 9,10‐seco‐bisacetal (IX), a vitamin D analogue, followed by hydrolysis and isomerization, gave the 8α,10α‐isomer of 6‐dehydroprogesterone (XI).
The crystal structure of MnNb4S8
Authors: Anzenhofer K. , de Boer J.J. 
Published: September 2010

AbstractUsing X‐ray reflection intensities collected with a single crystal, the crystal structure of MnNb4S8 has been determined. The position of Mn is uniquely defined. The difficulties arising in space group determination and crystal structure refinement are discussed in some detail; the most essential structural features are presented and compared with those of MnNb3S6.
Ring transformations in reactions of heterocyclic halogeno compounds with nucleophiles (XX): Pyrimidines (XXII). Conversion of some 5‐substituted 4‐chloro‐2‐phenyl‐pyrimidines into open‐chain compounds by potassium amide in liquid ammonia
Authors: van Meeteren H.W. , van der Plas H.C. 
Published: September 2010

Abstract5‐Methoxy‐, 5‐ethoxy‐, 5‐methylthio‐ and 5‐phenyl‐ 4‐chloro‐2‐phenyl‐pyrimidines are transformed into open‐chain products by reactions with potassium amide in liquid ammonia at — 33°. The mechanism of this reaction has been elucidated with help of 14C‐labelled pyrimidines. It is demonstrated that the amide ion attacks C(6) of the pyrimidine nucleus and causes fission of the C(5)‐C(6) bond.
Reduction of alkyl‐substituted benzoic acids with lithium in liquid ammonia: Synthesis of 1‐alkyl‐2,5‐cyclohexadiene‐1‐carboxylic acids
Authors: van Bekkum H. , van Den Bosch C. B. , van Minnen‐Pathuis G. , de Mos J. C. , van Wijk A. M. 
Published: September 2010

AbstractThe reduction of alkyl‐substituted benzoic acids with lithium in liquid ammonia has been investigated. Without added proton donor the aromatic acid yields a dianion which can either be protonated with ammonium chloride or alkylated to give the corresponding 1,4‐dihydrobenzoic acid and 1‐alkyl 2,5‐cyclohexadiene‐1‐carboxylic acid, respectively.In the presence of ethanol, 3‐ and 4‐alkylbenzoic acids yield either 1,4‐dihydro or 4,5‐dihydro products depending on the working up procedure Benzoic acid behaves similarly. Water is shown to be a useful proton donor in the reduction of 3‐ and 4‐alkylbenzoic acids to 1,4‐dihydro products. 2‐Alkylbenzoic acids yield 1,4‐dihydro products, irrespective of the experimental procedure.Experiments with 4‐deuterobenzoic acid show the first proton addition to be irreversible in ammonia as well as in ammonia‐ethanol.Some thirty new alkyl‐ and dialkyl‐cyclohexadienecarboxylic acids are described.
Preparation and Hofmann degradation of 1,1′‐dimethyl‐2,2′‐bis(trimethylammonio)‐bicyclopropyl dihydroxide
Authors: de Wolf W. H. , Bickelhaupt F. 
Published: September 2010

Abstract1,1′‐Dimethyl‐2,2′‐bis(trimethylammonio)bicyclopropyl dihydroxide (XIb) was synthesized from 2,3‐dimethylbutadiene and methyl diazoacetate via several difunctional 1,1′‐dimethylbicyclopropyl derivatives. Hofmann degradation of XIb yielded ∼7% of a xylene mixture [o : (m + p) = 10 : 1], together with 2,2′‐bis(dimethylamino)‐1,1′‐dimethylbicyclopropyl (X), 3‐[2‐(dimethylamino)‐1‐methylcyclopropyl]‐3‐methylcyclopropene (XII) and 1‐(3‐butynyl)‐2‐(dimethylamino)‐1‐methylcyclopropane (XIII). The possible intermediacy of 1,1′‐dimethylbicyclopropenyl (I) is briefly discussed.
The cause of the medium effect upon the rate of the electron‐exchange reaction between iron(II) and iron(III)
Authors: Gelsema W. J. , Vink H. A. 
Published: September 2010

AbstractThe iron(II)‐ iron(III) electron‐exchange rate has been measured at 0° in aqueous perchloric acid‐sodium perchlorate and perchloric acid‐lithium perchlorate mixtures of varying acid concentration, at three values of the ionic strength.The medium effects upon the rate of this reaction are interpreted as a result of a) the displacement of hydrolysis equilibria with the hydrogen ion concentration, and participation of the hydrolyzed ions in the exchange reaction, and b) the variation of the activity coefficients of the reacting species with the hydrogen ion concentration.
Dynamic Jahn‐Teller effect in the excited state of TeCl62−. √T dependence of the splitting of the C absorption band
Authors: Stufkens D. J. , Schenk A. 
Published: September 2010

AbstractAn investigation is reported on the temperature dependence of the splitting of the C‐band (1A1g → 1T1u) in the electronic absorption spectrum of TeCl62−. The splitting appears to be linearly dependent on the square root of temperature.This behaviour proves the correctness of our previous assumption 1 about the dynamic character of the splitting.
Ring transformations in reactions of heterocyclic halogeno compounds with nucleophiles (XXI): Conversion of 2‐chloropyrazine into imidazole and 2‐cyanoimidazole by potassium amide in liquid ammonia
Authors: Lont P. J. , van Der Plas H. C. , Koudijs A. 
Published: September 2010

AbstractBy treatment with potassium amide in liquid ammonia, 2‐chloropyrazine is converted into a mixture of 2‐cyanoimidazole, imidazole and 2‐aminopyrazine. The mechanism of the formation of the two ring‐contracted products is discussed.
A study on the effect of labelling on the solubility of cerium(III) oxalate in water: On the feasibility of the radiometric determination of solubility
Authors: Gelsema W. J. , Remijnse A. G. 
Published: September 2010

AbstractThe solubilities of cerium(III) oxalate, both inactive and labelled with 144Ce, in water at 25°, have been determined by chemisorption on cation exchange paper followed by X‐ray fluorescence analysis of the paper and proved to be identical within experimental error.The specific count rates of labelled cerium(III) oxalate in a saturated solution and in a standard solution in hydrochloric acid proved to be identical within experimental error.These results, which are in contrast with those of Spitsyn et al., demonstrate once more, the validity of the radiometric method for the determination of solubility.The solubility of anhydrous cerium(III) oxalate in water at 25° is 3.11 ± 0.16 mg · I−1.
Studies in the C8H8 field. Formation of Endo‐6‐ethynylbicyclo[3.1.0]hex‐2‐ene by gas‐phase photolysis of a carbon suboxide/bicyclo[2.2.1]hepta‐2,5‐diene mixture: (Short Communication)
Authors: Klumpp G.W. , van Dijk P.M. 
Published: September 2010

AbstractThe formation of endo‐6‐ethynylbicyclo[3.1.0]hex‐2‐ene (V) by gas‐phase photolysis of a carbon suboxide/bicyclo[2.2.1]hepta‐2,5‐diene mixture is described and possible reaction mechanisms are discussed.