bluuebunny/crossref_metadata_2025_split huggingface dataset:
Pyrazoles and imidazoles as ligands: Part I. Some simple metal(II) perchlorates and tetrafluoroborates solvated by neutral pyrazole and imidazole
Authors: Reedijk J. 
Published: September 2010

AbstractA number of new solvates containing pyrazole (Pz) and imidazole (Iz) as ligands, of the general formula M(ligand)n(anion)2 is reported. In these compounds M = Mg, Mn, Fe, Co, Ni, Cu, Zn and Cd, the anions are ClO4− and BF44−, and n is usually 6; n = 4 in the case of the Cu compounds and for Zn in combination with Iz.The compounds are characterized and identified by chemical analysis and physical measurements.With the aid of ligand‐field spectra in combination with X‐ray powder patterns, octahedrally coordinated metal ions are found in compounds of stoichiometry M(ligand)6(anion)2. Both Pz and Iz are placed in the spectro‐chemical and nephelauxetic series. The spectrochemical series appears to be (with increasing Dq): CH3CN < Iz < NH3 < Pz < en, whereas the nephelauxetic series (with decreasing B) has the sequence: CH3CN > NH3 > Iz > Pz > en.The magnetic moments for the transition‐metal compounds fall within the range usually observed for octahedrally coordinated ions. Both paramagnetic resonance measurements and the deviation of the magnetic moments from the spin‐only value, indicate a considerable amount of covalency in the metal‐ligand bond.Infrared spectroscopy evidently shows pure ionic ClO4− and BF4− for all solvates, except those of Cu(II) where the anions are coordinated to the metal ion. Except for the N‐H modes, no large shifts occur in the ligand infrared absorptions with respect to the free ligand. Compared with the gaseous ligands, the N‐H stretch in the solvates is decreased, whereas the bending modes are increased in frequency. This is attributed to ‐ weak ‐ hydrogen bonding with the anions in the lattice of these solvates.Metal‐ligand stretching frequencies for both ligands occur in the 165‐330 cm−1 range, and follow the Irving‐Williams sequence of metal ions.
1‐Methylheptatrienyl and methylcycloheptadienyl anions
Authors: Kloosterziel H. , van Drunen J. A. A. 
Published: September 2010

AbstractNMR spectroscopy has revealed that the reaction between trans,trans,trans‐ 2,4,6‐octatriene and potassium amide at ‐ 60° to ‐ 40° yields the trans‐ 1‐methyl, all‐trans heptatrienyl anion. At 0° this anion isomerizes largely to the cis‐1‐methyl anion. At room temperature the mixture of these two anions electrocyclizes completely to a mixture of 2‐ and 6‐methylcycloheptadieny! anions. The latter two anions are obtained separately from 3‐methylcyclohepta‐1,4‐diene and 5‐methylcyclohepta‐1,3‐diene, respectively.
A NMR study of N,N,N′,N′‐tetra‐alkylthiuram disulfides and their complexes with Zn, Cd and Hg
Authors: Brinkhoff H. C. , Grotens A. M. , Steggerda J. J. 
Published: September 2010

AbstractHindered rotation around the S2CNR2 bond of N,N,N′,N′‐tetra‐alkylthiuram disulfides is observed by NMR. The assumption that oxidation of bis‐dithiocarbamato complexes of Zn, Cd and Hg yield thiuram disulfide complexes of these metals is confirmed by the NMR spectra which reveal a magnetic non‐equivalence of the N‐alkyl groups. It is proposed that the metals in these complexes are tetrahedrally surrounded by two halogen and two sulfur atoms.
Synthesis of adamantane‐2‐carboxylic acid and of (2‐adamantyl)acetic acid from adamantanone
Authors: Scharp J. , Wynberg Hans , Strating J. 
Published: September 2010

AbstractA convenient synthesis of adamantane‐2‐carboxylic acid and (2‐adamantyl)‐acetic acid starting with adamantanone is described.
A general method for the preparation of cumulenic ethers and thioethers
Authors: Mantione R. , Alves A. , Montijn P. P. , Wildschut G. A. , Bos H. J. T. , Brandsma L. 
Published: September 2010

AbstractSolutions of lithiated cumulenic ethers and bis‐ethers R2CHCCC(Li)OR3 and R1OCHCCC(Li)OR3 can be obtained by treatment of the compounds R1OCH(R)2)CCCH2OR3 and R1OCH2CCCH(OR3)2 respectively with 2 equivalents of butyllithium in ether. Reaction of these solutions with H2O, D2O, methyl iodide, α‐chloro‐ethers or ketones gives the cumulenic compounds or their derivatives in good yields.Solutions of lithiated cumulenic thioethers R2CHCCC(Li)SR3 are obtained in an analogous way, but hydrolysis affords the isomeric enynic thioethers R2CHCHCCSR3 in addition to the expected cumulenic thioethers R2CHCCCHSR3. Elimination of R1OH from R1OC(R2)2CCCH(SR3)2 with 1 equivalent of C4H9Li leads to the cumulenic dithioacetals (R2)2CCCC(SR3)2.
Sterols in vernonia anthelmintica seed
Authors: Frost D. J. , Ward J. P. 
Published: September 2010

AbstractThe main sterol of Vernonia anthelmintica seed is 7,(Z)‐24(28)‐stigmastadienol (Ia). Stigmasterol and a C29‐sterol with a conjugated diene system, probably at C8 and C14, are also present, whilst GLC data indicate two other components to be 5‐stigmasten‐3β‐ol and 7,22‐stigmastadienol. A correlation of NMR data is given showing the stereochemistry at the ethylidene group of Ia and in related compounds.
The structure of Willstätter's compound: 3‐benzoyloxy‐2‐methoxycarbonyl‐2‐tropene
Authors: Beyerman H. C. , Maat L. , Sinnema A. 
Published: September 2010

AbstractWillstätter et al. obtained an unknown crystalline product by the benzoylation of 2‐methoxycarbonyl‐3‐tropanone. Proton magnetic resonance and infrared spectrometry have shown this product to be 3‐benzoyloxy‐2‐methoxycarbonyl‐2‐tropene, III. Attempted hydrogenation of III to a cocaine failed.
Studies on vitamin D and related compounds. Part 21. Photosensitized reactions
Authors: Snoeren A. E. C. , Daha M. R. , Lugtenburg J. , Havinga E. 
Published: September 2010

AbstractThe cis‐trans isomerisation of tachysterol3 and previtamin D3 trimethylsilyl ethers has been brought about by triplet sensitization. The two overall quantum yields have been estimated. It was found that the photochemical electrocyclic reactions of previtamin D3 yielding 7‐dehydrocholesterol and lumisterol3 go via singlet states. The irradiation mixtures were analysed by means of GLC.
Complexes with ligands containing the carbonyl group. Part II.: Metal(II) methyl formate, ethyl acetate and diethyl malonate solvates
Authors: Driessen W. L. , Groeneveld W. L. , van der Wey F. W. 
Published: September 2010

AbstractTwenty‐six new coordination compounds are reported with methyl formate, ethyl acetate and diethyl malonate as the ligands, viz. [M(HCOOCH3)62+] [FeCl4−]2, [M(HCOOCH3)62+] [InCl4−]2, [M(CH3COOC2H5)62+] [SbCl6−]2, and [M(CH2(COOC2H5)2)32+] [SbCl6−]2, where M is Mg(II), Mn(II), Fe(II), Co(II), Ni(II), and Zn(II), and for the ethyl acetate and diethyl malonate solvates M is also Ca(II).In the complexes the carbonyl stretching vibration is shifted to lower frequencies with regard to this vibration in the free ligands. The magnitudes of these shifts are dependent on the metal ions. Frequency‐shifts of other ligand vibrations are also observed. When the shifts are dependent on the metal ions, the magnitudes of the shifts follow the Irving‐Williams sequence.For the methyl formate and ethyl acetate solvates a metal‐dependent absorption band appears in the far infrared, which is attributed to the metal‐ligand stretching vibration. This band could not be located for the diethyl malonate solvates.Investigation of ligand field spectra indicates the presence of octahedral species M(O)62+ in the solid compounds. Values for Dq and B for the Co(II) and Ni(II) compounds are reported, and the ligands are placed in the spectro‐chemical and nephelauxetic series.
The crystal and molecular structure of 2‐Acetyl‐5‐Bromothiophene
Authors: Streurman Hetty J. , Schenk H. 
Published: September 2010

AbstractCrystals of 2‐acetyl‐5‐bromo‐thiophene are orthorhombic, space group Pbca, Z = 8, cell dimensions a = 7.334, b = 11.156, c = 17.906 Å.The conformation of the thienyl ring with respect to the carbonyl group is single‐trans.
Chemistry and spectroscopy in strongly acidic solutions. Part XXXI: Rates of carbonylation of stabilized carbonium ions
Authors: Hogeveen H. , Gaasbeek C. J. 
Published: September 2010

AbstractThe rate constants of carbonylation of some unsaturated carbonium ions and cyclopropylcarbonium ions have been determined. The results indicate that bicyclic homoallylic ions, e.g. the 7‐norbornadienyl ion, are stabilized by non‐classical electron delocalization.In the case of allylic ions the oxocarbonium ions initially formed cyclize to give cyclopentenone derivatives in high yield.
Transformations of 3,17‐Dioxo‐Δ4‐Androsten‐19‐al to estrane derivatives
Authors: Siegmann C. M. , de Winter M. S. 
Published: September 2010

Abstract3,17‐Dioxo‐Δ4‐androsten‐19‐al (II) is a suitable starting material for the preparation of estrane derivatives.Autoxidation gives the corresponding 10β‐hydroperoxide III, which can be converted to estrone (V) by reduction and aromatization.Treatment with alkaline reagents under various conditions can produce 3‐oxo‐Δ4‐ (VI), 3‐oxo‐Δ5(10) ‐ (VII) and 2‐hydroxymethylene‐3‐oxo‐Δ5(10) ‐ estrene (VIII) derivatives.
Hydrogenation of cyclohexene on evaporated nickel films
Authors: Erkelens J. , Eikema E. Th. J. 
Published: September 2010

AbstractThe reaction kinetics of the catalytic vapour‐phase hydrogenation of cyclohexene on evaporated nickel films has been studied in a temperature range from − 20 to − 45° in a flow system. To this end, an apparatus has been constructed in which hydrogen and cyclohexene partial pressures, flow‐rate and reaction temperature could be varied independently.In the range studied, the reaction has been found to be zero‐order with respect to the cyclohexene and roughly half‐order in regard to the hydrogen partial pressure, indicating that the formation of chemisorbed C6H11 groups is the slow step in the reaction. The measured rate was compared with that calculated from the absolute‐rate theory.
The vibrational spectra and the ionic structures of the compounds SCl4·SO3, SeCl4· SO3, TeCl4 · SO3 and (CH3)4N · SO3Cl
Authors: Gerding H. , Stufkens D. J. , Gijben H. 
Published: September 2010

AbstractPreparation, properties and Raman spectra of the compounds SCl4 · SO3, SeCl4 · SO3, TeCl4 · SO3 and (CH3)4N · SO3Cl are described. These compounds are ionic in nature, possessing the positive ions N(CH3)4, +, SCl3, +, SeCl3, + and TeCl3+ besides the common anion SO3Cl−.The frequencies of the SO3Cl− ion in these compounds are compared with our assignment1. The Raman spectra of TeCl4 · GaCl3 (TeCl3·+GaCl4−) and SCl4 are given also.
Conversion of 4,6‐disubstituted pyrimidines into 1,2,4‐Triazoles by action of Hydrazine
Authors: van der Plas H. C. , Jongejan H. 
Published: September 2010

Abstract4,6‐Diethoxy‐, 4‐ethoxy‐6‐hydrazino‐, 4,6‐dichloro‐, 4,6‐di(methylthio)‐and 4,6‐dihydrazinopyrimidine react with aqueous hydrazine at 210° to give 3‐methyl‐1,2,4‐triazole. Evidence is presented that in this unprecedented ring contraction reaction the C(2)‐N(3 or 1)‐C(4 or 6)‐C(5) fragment of the pyrimidine ring is involved in the formation of this 1,2,4‐triazole.
The photolysis of Cyclopropanecarbaldehyde at 313 nm and 254 nm in the presence of CIS‐Butene
Authors: Overwater J. J. I. , Cerfontain H. 
Published: September 2010

AbstractCyclopropanecarbaldehyde has been photolyzed in the gas phase with light of 313 nm and 254 nm in the presence of cis‐2‐butene. With increasing total pressure the quantum yields of the gaseous products, carbon monoxide, ethene, propene and cyclopropane, decrease. The photolysis is accompanied by isomerization of cis‐2‐butene to trans‐2‐butene, due to the transfer of triplet energy from the aldehyde to the olefin. The quantum yield of the 2‐butene triplet, ØBT, increases with increasing concentration of added cis‐2‐butene. At a temperature of 50°, ØBT is about proportional to the concentration of cis‐2‐butene. At a temperature of 150°, however, ØBT very quickly reaches a constant value which is much lower for the photolysis with light of 313 nm (ØBT ∼ 0.05) than for that with light of 254 nm (ØBT ∼ 0.25).
Instability of complexes containing the dicyclopentadienylvanadium(iv) group
Authors: Siegert F. W. , H. J. De Liefde Meijer  
Published: September 2010

AbstractThe preparation of complexes of the type (π‐C5H5)2VR2 has been attempted by reaction of one mole of vanadocene dichloride with two moles of an organo‐metallic reagent RM (RM = C6H5Na and C6F5Li); these reactions result in the formation of complexes of the type (π‐C5H5)2VR. The reaction of vanadocene dichloride with 1,4‐dilithio‐1,2,3,4‐tetraphenylbutadiene results in the formation of a tarrish polymer, whereas the corresponding reaction starting from titanocene dichloride yields the green complex (π‐C5H5)2Ti[C4(C6H5)4]. The failure of the preparation of complexes of the type (π‐C5H5)2VR2 is ascribed to steric reasons.
On the origin of the byproducts in the autoxidation of cyclohexane to cyclohexanol and cyclohexanone
Authors: Duynstee E. F. J. , Hennekens J. L. J. P. 
Published: September 2010

AbstractTracer experiments involving autoxidation of dilute solutions of inactive cyclohexanol and inactive cyclohexanone in 14C‐labeled cyclohexane have shown that a number of byproducts such as butanol, pentanol, butyric acid, valeric acid, caproic acid, and ϵ‐hydroxycaproic acid are to a large part formed directly from cyclohexane and not via cyclohexanol and cyclohexanone. The label distribution in ϵ‐cyclohexyloxycaproic acid, hitherto unknown as a byproduct in the cyclohexane oxidation, clearly indicated that this acid is formed from the addition product of cyclohexyl hydroperoxide and cyclohexanone.
A comparison of the behaviour of (1‐adamantyl)‐ and (2‐adamantyl)‐carboxylic acids during Kolbe electrolysis
Authors: van Zorge J. A. , Strating J. , Wynberg Hans 
Published: September 2010

AbstractThe anodic oxidation of adamantane‐2‐carboxylic acid in alcoholic solution leads to the formation of a mixture of radical‐derived and carbonium ion‐derived products, whereas adamantane‐1‐carboxylic acid yields only the carbonium ion‐derived product. (2‐Adamantyl)acetic acid gives chiefly the radical‐derived product in contrast to (1‐adamantyl)acetic acid, which yields carbonium ion‐derived products. In the electrolysis of 3‐(1‐adamantyl)propionic acid the radical‐derived compound is the main product. A rationalization of these results is presented.
A conformational study on glycerol in a D2O solution by means of 220 Mc PMR data
Authors: van Koningsveld H. 
Published: September 2010

AbstractThe PMR spectral parameters of glycerol in a D2O solution are determined at different temperatures with a PMR apparatus operating at 220 Mc.With these parameters—assuming no correlation between rotational positions of the terminal CH2OH groups‐graphs are drawn of the population of a particular conformation as a function of the Jtrans ( JT) and JGauche ( JG) coupling constants. If the condition Eα ≤ Eβ ≤ Eγ is imposed the calculations show that the proportion of molecules in the αα conformation is about 20%.The result is verified from “trial” values for JT and JG taken from the literature. If Eα < Eβ, the calculated values for Eβ‐Eα and Eγ‐Eα are 375 ± 100 cal and 200 ± 50 cal, respectively.
Organophosphorus compounds. Part IX: Decomposition of ω‐dimethylaminoalkyl methylphosphonofluoridates and isomerization of 2‐dipropylaminoethyl methylphosphonofluoridothionate
Authors: Benschop H. P. , van den Berg G. R. , Kraay G. W. 
Published: September 2010

AbstractThe decomposition product of 2‐dimethylaminoethyl methylphosphonofluoridate (IV, n = 2) was identified as 1,1,4,4‐tetramethylpiperazinium bis‐(methylphosphonofluoridate) (VI). In hexadeuteriodimethyl sulfoxide (60°), the first‐order rate of decomposition of IV (n = 2) is ∼ 830 times greater than the rate of the analogous decomposition of 2‐dimethylaminoethyl isopropyl methylphosphonate (XV).The hitherto unreported O‐2‐dimethylaminoethyl methylphosphonofluoridothioate (IX, R = Me) degrades on heating to 1,1,4,4‐tetramethylpiperazinium bis(methylphosphonofluoridothioate) (XIII, R = Me), whereas IX (R = n‐Pr) rearranges to S‐2‐di‐n‐propylaminoethyl methylphosphonofluoridothioate (XI, R = n‐Pr). Arguments are put forward that the decomposition reactions of IV (n = 2), XV and IX (R = Me), as well as the rearrangement of IX (R = n‐Pr) proceed via a 1,1‐dialkylaziridinium cation.The decomposition of 3‐dimethylaminopropyl methylphosphonofluoridate (IV, n = 3) at 40° gives a polymeric salt [VIII, Y = OPO(Me)F].
Synthesis of 2‐(6′‐carboxyhexyl)‐4‐hydroxy‐3‐(3′‐hydroxyoctyl)‐1‐cyclopentanone (racemic dihydroprostaglandin E1)
Authors: Klok R. , Pabon H. J. J. , van Dorp D. A. 
Published: September 2010

AbstractBy the reaction of 3‐(3′‐acetoxyoctyl)‐2‐(6′‐carboxyhexyl)‐2‐cyclopenten‐1‐one, the acetoxy derivative of Prostaglandin E1 ‐ 237 (PGE1 ‐ 237), with N‐bromosuccinimide in carbon tetrachloride, followed by treatment of the reaction product with silver acetate in acetic acid, an acetoxy group was introduced at the allyl position of the ring. After hydrolysis of both acetoxy groups, 2‐(6′‐carboxyhexyl)‐4‐hydroxy‐3‐(3′‐hydroxyoctyl)‐2‐cyclopenten‐1‐one was obtained.In an attempt to convert the latter into 2‐(6′‐carboxyhexyl)‐4‐hydroxy‐3‐(3′‐hydroxyoctyl)‐1‐cyclopentanone (racemic dihydro‐PGE1), hydrogenation with a 5 % rhodium on carbon catalyst was carried out. Both reduction of the double bond in the ring and hydrogenolysis of the hydroxy group attached to the ring occurred, leading to 2‐(6′‐carboxyhexyl)‐3‐(3′‐hydroxyoctyl)‐1‐cyclo‐pentanone. However, racemic dihydro‐PGE1 was also obtained in low yield. It showed some biological activity on blood‐platelet aggregation.
Photochemical cycloaddition of o‐quinones to allenes; 2‐alkylidene‐2,3‐dihydro‐1,4‐dioxins
Authors: Bos H. J. T. , Slagt C. , Boleij J. S. M. 
Published: September 2010

AbstractPhenanthroquinone was added photochemically to allene and nine of its methyl, methoxy and methylthio derivatives. Several 2‐alkylidene‐2,3‐dihydrophenanthro[9,10‐b]‐1,4‐dioxins were isolated; 2: 1‐adducts were sometimes found as byproducts. The directiospecificity of the addition was investigated. The stereochemistry and conformation of the adducts are discussed in relation to long‐range NMR coupling constants. Tetrachloro‐o‐benzoquinone was added similarly to methoxyallene. This addition could also be performed thermally.
Hydrogen bonding. Part III: The proton acceptor ability of S = O groups: Sulfinic esters and sulfinyl chlorides as hydrogen bond acceptors
Authors: Engberts J. B. F. N. , Zuidema G. 
Published: September 2010

AbstractIntermolecular hydrogen bonding between phenol and a series of sulfinic esters and sulfinyl chlorides has been studied by IR spectroscopy. The magnitudes of the OH stretching frequency shifts, Δν, indicate that inductive effects of substituents attached to the sulfur atom predominate over resonance effects in determining the sulfur‐oxygen bond polarity.The Δν values of nine different types of sulfinyl, XS(O)Y, and sulfonyl, XSO2Y, compounds (X and/or Y are CH3, CH3O, Cl) are compared and interpreted in terms of the ground state electron availibility on the oxygen atom of the SO acceptor site. The preparation of the first representative of an aryl alkanesulfinate, CH3S(O)OC6H5, is described.
Rhodaninato‐ and 3‐substituted rhodanine complexes of palladium and platinum
Authors: Moers F. G. , Langhout J. P. 
Published: September 2010

AbstractPalladium and platinum complexes of the rhodaninato ion and 3‐substituted rhodanines have been prepared. From infrared spectra in the 4000‐200 cm−1 region and nuclear magnetic resonance data it is concluded that for the compounds ML2X2 (where X = Cl, Br, I and L = 3‐substituted rhodanine) the metal is bonded via the thiocarbonyl group of the ligand. The assignment of the M‐X and M‐S stretching vibrations is given and discussed. In the compounds ML2 (where L is the rhodaninato ion) the rhodanine is complexed as monobasic anion. For these complexes we suggest a polymeric structure in which the coordination takes place through the nitrogen and the thiocarbonyl group of the ligand.
Raman and infrared spectroscopic investigations of the SbCl4− and AsCl4− ions
Authors: Stufkens D. J. , Wilmans A. M. , Gerding H. 
Published: September 2010

AbstractThe preparation, Raman and infrared spectra of (PyH)SbCl4, (Et4N)SbCl4, (Bu4N)SbCl4 and (Bu4N)AsCl4 are reported. The spectra of (PyH)SbCl4, (Et4N)SbCl4 and (Bu4N)AsCl4 demonstrate the polymeric behaviour of SbCl4− and AsCl4−; (Bu4N)SbCl4 on the other hand shows the spectrum of a monomeric ion SbCl4− in the solid phase and in dilute solutions.
A NMR and dielectric study of some adducts of aluminium halides and phosphines
Authors: Vriezen W. H. N. , Jellinek F. 
Published: September 2010

AbstractThe 27Al magnetic resonance was studied in benzene and toluene solutions containing AlX3 (X = Cl, Br) (0.2−0.25 M) and PR3 (R = C2H5, C6H5) in molar ratios varying from 1: 1 to 1: 16. In the solutions containing P(C6H5)3 the adducts (C6H5)3PAlX3 were found to be the only Al‐containing species present in significant concentrations. In solutions containing P(C2H5)3, adducts (C2H5)3PAlX3 and {(C2H5)3P}2AlX3 are present; the stability constants of {(C2H5)3P}2AlX3 were determined. These results are supported by dielectric measurements, which show the adducts {(C2H5)3P}2AlX3 to have small dipole moments, probably due to a trigonal‐bipyramidal structure with the phosphine ligands in the axial positions.
Thiophene analogues of fluorene and diphenylmethane‐autoxidation reactions
Authors: Rawson G. , Wynberg Hans 
Published: September 2010

AbstractOxidation of the isomeric cyclopentadithiophenes by oxygen in the presence of potassium t‐butoxide in t‐butanol‐dimethyl sulfoxide (4 : 1), or Triton B in pyridine, caused a cleavage reaction to occur and gave the corresponding bithienylcarboxylic acids. In contrast, the dithienylmethanes gave the corresponding dithienyl ketones. The Michael reaction of 7 H‐cyclopenta[1,2‐b: 4,3‐b′]dithiophene with acrylonitrile is also described.
Thiophene analogues of fluorenone: Cleavage reactions
Authors: Rawson G. , Wynberg Hans 
Published: September 2010

AbstractThe cleavage reactions of non‐enolizable thienyl ketones have been studied. Potassium t‐butoxide in t‐butanol, ether or dioxane has proved to be a mild cleavage reagent. With most ketones high yields of acids were obtained after a short reaction time at room‐temperature. Possible mechanisms for these mild reactions and the Haller‐Bauer cleavage of thienyl ketones are discussed.
Enthalpies of transfer of alkali halides between different solvents
Authors: Somsen G. , Weeda L. 
Published: September 2010

AbstractEnthalpies of solution of alkali halides in formamide, N‐methylformamide, N, N‐dimethylformamide, N‐methylacetamide, dimethyl sulfoxide, water, methanol and ammonia are discussed. The ensuing enthalpies of transfer between any two solvents are nearly constant for salts with a common anion. The enthalpies of solution of a single salt in the different liquids can be correlated with the structure of the solvent.
Raman spectra of phosphorus pentabromide, phosphorus heptabromide and caesium tribromide
Authors: Gabes W. , Gerding H. 
Published: September 2010

AbstractThe Raman spectra of solid powders of phosphorus pentabromide, phosphorus heptabromide and caesium tribromide are reported. The spectra are explained in terms of site symmetry splitting and factor group splitting.
N,N‐dimethylaminoacetylene: (Short Communication)
Authors: Brandsma L. 
Published: September 2010

AbstractN,NDimethylaminoacetylene. HC  CN(CH3)2 has been obtained in about 55% yield by elimination of thiol from the ketene‐N,S‐acetal H2CC (SC4H9)‐(N(CH3)2). The latter compound was synthesized by converting CH3C (O)N‐(CH3)2 into the corresponding thioamide (94% yield) and treating the anion of the thioamide (generated by means of potassium amide) with butyl bromide (85% yield).