bluuebunny/crossref_metadata_2025_split huggingface dataset:
Sulfonation and sulfation in reactions of C‐methylated phenols and anisoles with sulfur trioxide. 4‐Substituted phenyl hydrogen sulfates: Effective reagents for transsulfonation
Authors: Goossens Hans D. , Lambrechts Hans J. A. , Cerfontain Hans , de Wit Peter 
Published: September 2010

AbstractThe sulfation and sulfonation of the methyl‐ and dimethylphenols with 0.9 and 4.0 equiv. of SO3 in nitromethane at 0°C have been studied. On using 0.9 equiv. of SO3, the sulfonic acid product distributions are determined by the ortho‐ and para‐directing effect of the activating hydroxy substituent. In the reactions with 4.0 equiv. of SO3, the sulfonic acid product distributions are affected by the predominant initial formation and the subsequent sulfonation of the corresponding phenyl hydrogen sulfates, of which the bulky OSO3H substituent is electronically deactivating and (mainly) para‐directing. For comparison, the sulfonation of the methylanisoles, phenyl methanesulfonate and 2,3‐dihydrobenzofuran was also studied.The sulfonation of 1,3‐dimethoxybenzene in (2H8)dioxane at 17.0°C has been studied using 4‐substituted phenyl hydrogen sulfates as transsulfonating agents. The transsulfonation was found to be first order with respect to the phenyl hydrogen sulfates and independent of the 1,3‐dimethoxybenzene concentration. The reaction constant of the transsulfonation reaction was determined to be ρ = 2.0 ± 0.2.
Stéréosélectivité de la radioréduction γ d'alkylcyclohexanones
Authors: Alipour E. , Micheau J. C. , Paillous N. 
Published: September 2010

AbstractLa radioréduction γ de cyclohexanones substituées conduit principalement aux deux cyclohexanols diastéréoisomères correspondants. La stéréosélectivité de cette réaction dépend de la concentration en cétone. L'existence de deux radicaux pyramidaux diastéréoisomères, précurseurs des cyclohexanols, est à l'origine des stéréosélectivités observées. Un processus de solvatation sélective de l'OH radicalaire a été proposé pour rendre compte des variations de stéréosélectivité avec la concentration en cétone.γ Radioreduction of substituted cyclohexanones mainly leads to diastereoisomeric cyclohexanols. The stereoselectivity of radioreduction depends on ketone concentration. The assumption of two pyramidal diastereoisomeric hydroxycyclohexyl radicals explains the observed stereoselectivity. A selective solvation process of the hydroxy group of the radical has been proposed to account for the variations of stereoselectivity with ketone concentration.
Synthesis of L‐glycero‐D‐manno‐heptose
Authors: Boons G. J. P. H. , van der Klein P. A. M. , van der Marel G. A. , van Boom J. H. 
Published: September 2010

AbstractThe easily accessible benzyl 2,3,4‐tri‐O‐benzyl‐α‐D‐manno‐hexodialdo‐1,5‐pyranoside (2) can be converted, in a highly stereoselective manner, by the two‐step Tamao method to benzyl 2,3,4‐tri‐O‐benzyl‐β‐L‐glycero‐D‐manno‐heptopyranoside (4a).
Synthesis of bis[2‐(dimethylarsino)ethyl]amine (daea) and its complexation with rh(i) and Pd(II)
Authors: Jaouhari R. , Edwards P. G. 
Published: September 2010

AbstractThe preparation of the new chelating ‘HYBRID’ ligand containing secondary amine and tertiary arsine donors HN(CH2CH2AsMe2)2 is described. The simple coordination chemistry with [RhCl(COD)]2 (COD = cycloocta‐1,5‐diene) and Na2PdCl4 to give square planar complexes is also reported.
Preparation and properties of S,S‐diphenyl amino acid phosphorodithioates
Authors: Kuyl‐Yeheskiely E. , Tromp C. M. , Geluk A. , van der Marel G. A. , van Boom J. H. 
Published: September 2010

AbstractS,S‐diphenyl phosphorodithioates of appropriately protected serine and tyrosine have been prepared. In the case of serine, neighbouring group participation of a free N‐or C‐terminus on the corresponding triester functions leads to the formation of aziridine and phosphoserine derivatives, respectively.
Sulfonation and sulfation on reaction of 1,4‐dihydroxybenzene and its methyl ethers in concentrated sulfuric acid
Authors: Cerfontain Hans , Koeberg‐Telder Ankie 
Published: September 2010

AbstractThe homogeneous reactions of 1,4‐dihydroxybenzene (1), its monomethyl (2) and dimethyl ether (3) and 2‐3‐sulfonic acid in 68‐105% H2SO4 at 25°C have been studied and isomer distributions and rate coefficients for the various subsequent sulfonations, as well as the equilibrium data for the sulfation (‐OH⇌ ‐OSO3H), are reported. For 2, the ratio of 2‐ to 3‐sulfonation decreases upon increasing the sulfuric acid concentration from 68‐98.5% H2SO4, due to a gradual change‐over in the effective sulfonating entity from H3SO4 + to H2S2O7. For 1‐2‐sulfonic acid (1‐2‐S), 2‐2‐S and 2‐3‐S, the ratios of 5‐ to 6‐sulfonation are all ca. 25:75, whereas 3‐2‐S only yields the 5‐sulfonic acid. Demethylation of the sulfonic acids of 2 and 3 in ≤98.5% H2SO4 is of minor importance, but plays a major role in 105.0% H2SO4, the eventual products being the bis(hydrogen sulfate)s 10 and 15, the tricyclic bis(sulfate sulfonate anhydride) 11 and the bicyclic hydrogen sulfate 16.Mechanisms for the sulfodemethylation and for the cyclization of the 2‐sulfophenyl hydrogen sulfate moiety to the 1,3,2,4‐benzodioxadithiin 2,2,4,4‐tetraoxide system are proposed.
Acetalation studies. Part VI. Concerning the effects of ultrasound on the benzylidenation of some alkyl D‐glycopyranosides
Authors: Chittenden Gordon J. F. 
Published: September 2010

AbstractThe effects of ultrasound on conventional Freudenberg‐type benzylidenation reactions of some alkyl D‐glycopyranosides is described. A considerable enhancement in the rates of formation of the expected acetals was observed. The pure products were obtained in good yields. Some of the crude air‐dried products were suitable for direct derivatisation.
Synthesis of a cell wall component of haemophilus (actinobacillus) pleuropneumoniae type 2
Authors: Veeneman G. H. , Brugghe H. F. , Hoogerhout P. , van der Marel G. A. , van Boom J. H. 
Published: September 2010

AbstractCoupling of properly protected repeating tetrasaccharide units of Haemophilus (Actinobacillus) pleuropneumoniae could be realized by regioselective phosphorylation.
Evidence of an ordered columnar mesophase in peripherally octa‐n‐alkoxy‐substituted phthalocyanines
Authors: van der Pol J.F. , Neeleman E. , Zwikker J.W. , Drenth W. , Nolte R.J.M. 
Published: September 2010

AbstractLiquid crystalline phthalocyanines with eight n‐alkoxy chains have been synthesized and their mesophase structures determined by X‐ray diffraction. The mesophases appear to be of the Dho type. Reasons for the preference of ordered columns are discussed.
[(3‐13C)‐3‐Aminopropyl]triethoxysilane; synthesis and spectral characterization of 13C‐substituted compounds
Authors: Jenneskens Leonardus W. , van den Berg Ellen M. M. , Heemskerk Bram , Lugtenburg Johan 
Published: September 2010

AbstractThe synthesis of [(3‐13C)‐3‐aminopropyl]triethoxysilane (la) from (1‐13C)acrylonitrile (4a) is described. The latter was prepared from potassium (13C)cyanide (13C‐enrichment > 99%) and 2‐bromoethanol (7). The spectroscopic properties of the 13C‐substituted compounds are discussed.
1,3,5‐Hexatriene photochemistry. The photo‐isomerization of (Z)‐3‐(6′,6′‐dimethyl‐2′‐methylenecyclohexylidene)‐1‐propene
Authors: Geenevasen Jan A. J. , Cerfontain Hans 
Published: September 2010

AbstractThe photo‐isomerization of (Z)‐3‐(6′,6′‐dimethyl‐2′‐methylenecyclohexylidene)‐1‐propene [(Z)‐3a] has been studied under conditions of triplet photosensitization, using benzophenone as sensitizer, and direct irradiation with λ 254 nm. Under the former conditions, only Z‐E isomerization is observed leading to a photostationary state with {[Z]/[E]}pss = 1.77 and 1.50 for benzene and chloroform as the respective solvent. Upon direct irradiation, the primary products are (E)‐3a, the tricyclodecene 11a and the bicyclooctene 12a, formed in an initial ratio of 9/2.0/1.0. The two polycyclic isomers 11a and 12a apparently result from the excited singlet state. NOE 1N NMR measurements illustrate hat (Z)‐3a is present mainly in a s‐transoid conformation.
Photochemistry of two diphenyl β,γ‐enones and a series of methyl‐ and phenyl‐substituted α‐phenyl ketones
Authors: Koppes Margareth J. C. M. , Crabbendam Astrid M. , Cerfontain Hans 
Published: September 2010

AbstractThe photochemistry of the diphenyl β,γ‐enones2and3and the methyl‐ and phenyl‐substituted α‐phenyl ketones4‐9has been studied, using mainly benzene as solvent. Irradiation of2with λ 300 nm leads to the 1,3‐acyl shift (1,3‐AS) product17, relatively small amounts of the decarbonylation products15and16, and the photo‐oxidation products benzophenone (18) and the α,β‐unsaturated aldehyde19. Direct irradiation of the 1,3‐AS product17yields15, 16, 18and19, but no2.Direct irradiation of 3 with λ 350 nm leads mainly to the formation of 1,3‐AS products (E)‐ and (Z)‐22, the decarbonylation products (E)‐ and (Z)‐20and21and, in addition, a small amount of thecis‐di‐π‐methane isomer23.Direct irradiation of the substituted α‐phenyl ketones4, 5, 8and9with γ 300 nm leads predominantly to the formation of the radical coupling products 2,3‐butanedione and24‐27, respectively, whereas6and7yield 1,2‐diphenyl‐1,2‐ethanedione and the respective24and25. The acetone‐sensitized irradiation of4leads to 4‐phenyl‐2‐butanone (33) in addition to 2,3‐butanedione and 1,2‐diphenylethane (24).
An unusual 1,2‐silyl shift during the reaction of an α‐oxo sulfine with an allylsilane
Authors: Rewinkel J. B. M. , Zwanenburg B. , García‐Granda S. , Beurskens P. T. , Raaijmakers R. 
Published: September 2010

AbstractThe reaction of 1‐oxo‐2‐thioxo‐indane S‐oxide 1 with 1‐(trimethylsilyl)‐1 H‐indene 2 gave endo‐2‐oxo‐7‐(trimethylsilyl)‐5,6‐benzo‐2‐thiabicyclo[2.2.1]hept‐5‐ene‐3‐spiro‐2′‐indan‐1′‐one 3 as the sole product. The crystal and molecular structure of the corresponding sulfone, 4, C21H22O3SSi, was established by X‐ray diffraction analysis. The endo structure of the sulfoxide 3 was deduced from 1H NMR spectra. The formation of the product 3 can be explained by invoking a 1,2‐silyl shift.
The rate‐determining step in the epoxidation of alkenes by the cytochrome P‐450 model manganese(III) porphyrin/hypochlorite
Authors: van der Made A. W. , Groot P. M. F. C. , Nolte R. J. M. , Drenth W. 
Published: September 2010

AbstractUsing low‐temperature trapping experiments with 1,1‐diphenyl‐2‐picrylhydrazine monitored by UV/Vis spectroscopy, it is shown that the rate‐determining step in the epoxidation of alkenes by hypochlorite, catalysed by manganese(III) porphyrins, involves the formation of the active oxo‐manganese species [(P)MnO]+.
8,16‐ And 8,18‐methanobacteriorhodopsin. Synthesis and spectroscopy of 8,16‐ and 8,18‐methanoretinal and their interaction with bacterioopsin
Authors: van der Steen R. , Biesheuvel P. L. , Lugtenburg J. , Erkelens C. , Mathies R. A. 
Published: September 2010

Abstract8,16‐ And 8,18‐methanoretinal with a locked 6‐s‐trans and a 6‐s‐cis conformation have been synthesized and characterized. Their 9‐Z and 13‐Z isomers could also be prepared, in contrast to the 11‐Z. 8,16‐Methanoretinal easily binds with bacterioopsin (bO) to form a bacteriorhodopsin analogue which closely resembles natural bacteriorhodopsin (bR) (λmax, light‐dark adaptation and proton pump action). The interaction of 8,18‐methanoretinal with bO is complex. These findings give additional support to the fact that in bR the chromophore occurs in the planar 6‐s‐trans conformation. Approximately 1200 cm−1 of the opsin shift in bR (5100 cm−1) arises because the chromophore changes upon binding to the protein from a 40° twisted 6‐s‐cis to a planar 6‐s‐trans conformation. Both 8,16‐ and 8,18‐methano bR have a ∼3900 cm−1 opsin shift, since the C6‐C7 conformation does not allow protein‐induced changes. This is consistent with the idea that the opsin shift is mainly due to the perturbation of the Schiff base region.
Para‐nitrosation of a primary and a secondary amine in aqueous solution: 2,6‐di‐tert‐butyl‐4‐nitrosoaniline and N, 2‐di‐tert‐butyl‐4‐nitrosoaniline
Authors: Hoefnagel M. A. , Wepster B. M. 
Published: September 2010

Abstract2,6‐Di‐tert‐butylaniline 1 and N, 2‐di‐tert‐butylaniline 2 yield their 4‐nitroso derivatives on treatment with nitrous acid in aqueous media. Electronic spectra in various solvents show that these products, as well as 4‐nitrosoaniline and 4‐nitroso‐N‐methylaniline, have the nitroso‐amino structure and not the prototropic quinonoid form.
Cation complexation with functionalized 9‐arylacridinium ions: Possible applications in the development of cation‐selective optical probes
Authors: Jonker S. A. , Ariese F. , Verhoeven J. W. 
Published: September 2010

AbstractAbsorptive and emissive properties of 9‐arylacridinium ions 2‐6 have been studied and shown to be dependent on the electron‐donating properties of the aryl group. While for 2 and 3 the first excited state remains largely localized on the acridinium chromophore, interaction of this chromophore with the electron‐donor‐substituted aryl group in 4‐6 produces a low‐lying intramolecular charge‐transfer state, resulting in a state inversion. This state inversion leads to the appearance of a new long‐wavelength absorption in the visible region and to complete quenching of the acridinium fluorescence. Protonation of the amino function in 4‐6 cancels this state inversion, thereby causing a dramatic chromofluoroionophoric effect, i.e. cation‐induced change of both colour and fluorescence properties. Replacing the amino function by an aza crown ether resulted in system 7, which displays similar effects, not only upon protonation but also upon metal ion complexation.
The reaction between a phosphole and diphenylketene at high pressure; an unexpected outcome
Authors: Isaacs Neil S. , El‐Din Ghazi Najem , Drew Michael G. B. 
Published: September 2010

AbstractThe reaction between 3,4‐dimethyl‐l‐phenylphosphole and diphenylketene at 10 kbar, 25 °C, leads to the formation not of a 1:1 cycloadduct but to a novel spirodioxaphosphorane formed from four molecules of diphenylketene and one of phosphole which loses in the process all its ring carbons. The structure is established by X‐ray crystallography.
Redox properties of cerium‐exchanged Y‐zeolites
Authors: Floor M. , Kieboom A. P. G. , van Bekkum H. 
Published: September 2010

AbstractThe oxidation of cerium(III)‐exchanged zeolite NaY (exchange level 24‐91%) with aqueous hydrogen peroxide and oxygen has been studied. The fraction of Ce(IV) produced decreases with increasing Ce content of the zeolites. Hydrogen peroxide is catalytically decomposed by the Ce(III)/Ce(IV) redox couple with formation of an equilibrium level of a Ce(IV) hydroxide species. Oxidation with oxygen at temperatures higher than 400 K yields an oxycerium(IV) complex. The latter NaCe(IV)Y zeolite effects oxidative glycol cleavage of 2,3‐dimethyl‐2,3‐butanediol to acetone. Activation in oxygen restored its oxidizing capacity. Thus, the oxygen‐activated NaCe(IV)Y zeolite is a regenerable glycol‐cleaving oxidant. The H2O2‐oxidized NaCe(IV)Y is not active in glycol‐cleavage oxidiation.
Transition metal compounds of 5,7‐dimethyl[1,2,4]triazolo[1,5‐a]pyrimidine (dmtp). X‐ray structures of trans‐tetraaquabis(dmtp‐N3)nickel(II) diiodide dihydrate and trans‐diaquatetrakis(dmtp‐N3)nickel(II) bis(triiodide) bis‐dmtp
Authors: Lenstra A. T. H. , Slot H. J. Bruins , Beurskens Paul T. , Haasnoot J. G. , Reedijk J. 
Published: September 2010

Abstract5,7‐Dimethyl[1,2,4]triazolo[1,5‐a]pyrimidine (dmtp) has been used as a ligand for nickel(II) and cobalt(II) chloride, bromide, iodide and triiodide. The halides yield compounds of composition trans‐[M(dmtp)2(H2O)4](H2O)2X2, the triiodides having the composition trans‐[M(dmtp)4(H2O)2](dmtp)2(I3)2. The IR spectra of he halides are all mutually isomorphous, differing from those of the triiodides. Spectroscopic properties agree with octahedrally coordinated metal ions with MN2O4 and MN4O2 chromophores, respectively. The crystal structures of two representative compounds, i.e. the nickel iodide and the nickel triiodide compounds, are described.[Ni(dmtp)2(H2O)4](H2O)2I2 is triclinic, P−1, a 8.175(1) Å, b 8.263(3) Å, c 9.628(2) Å), α 85.60(2)°, β 81.84(2)°, γ 82.06(2)°, Z 1, dc 1.870 Mg.m−3, R 0.084 based on 2516 reflections. Ni2+ is octahedrally coordinated by two N(3)‐bonded dmtp ligands (trans‐oriented) with Ni‐N 2.080(6) Å) and four water molecules with Ni‐O 2.067(6) Å and 2.094(6) Å, respectively. The iodides and the remaining water molecules are retained in the lattice, through extensive hydrogen bonding. [Ni(dmtp)4(H2O)2](dmtp)2(I3)2 is triclinic, P−1, a 12.428(2) Å, b 14.852(2) Å, c 8.795(2) Å, α 103.27(2)°, (3 108.80(3)°, γ 89.73(2)°, Z 1, dc 1.944 mg.m−3, R 0.092 based on 3724 reflections. Ni2+ is octahedrally coordinated by two water molecules in a trans orientation with Ni‐O 2.13(1) Å and by four N(3)‐bonded dmtp ligands with Ni‐N 2.07(2) Å and 2.09(2) Å, respectively. The triiodide ions are linear with II bonds of 2.918(3) Å and 2.884(3) Å. The compound forms a lattice adduct with two extra dmtp molecules, with stacking interactions.
Synthesis and NMR spectroscopy of stable isotope‐labelled phenols and L‐tyrosines
Authors: Winkel C. , Aarts M. W. M. M. , van der Heide F. R. , Buitenhuis E. G. , Lugtenburg J. 
Published: September 2010

AbstractThe syntheses of (17O)phenol from (17O)water, (18O)phenol from (18O)water, (1‐13C)‐phenol and (4‐13C)phenol from (2‐13C)acetone and (2‐13C)phenol and (3‐13C)phenol from (1‐13C)‐acetone with high isotopic enrichment are described. The labelled phenols are converted into their corresponding L‐tyrosines by the bacterium Erwinia herbicola. A full analysis of the 1H and 13C NMR spectra of phenol and L‐tyrosine is reported.
Conformational analysis of some chiral catalysts of the cinchona1 and ephedra2 family. The alkaloid catalyzed addition of aromatic thiols to cyclic α,β‐unsaturated ketones
Authors: Dijkstra Gerard D. H. , Kellogg Richard M. , Wynberg Hans 
Published: September 2010

AbstractThe minimum energy conformations of quinine, quinidine, ephedrine and N‐methyl‐ephedrine have been calculated using molecular mechanics and semi‐empirical techniques. Conformational data for quinine and quinidine in solution have been obtained by 2D‐NMR. No evidence has been found for an earlier proposed conformational change of the catalysts3 in the asymmetric Michael addition between cycloalkenones and aromatic thiols. The preferred orientations between 4‐methylbenzenethiol and quinine have been predicted with molecular docking calculations; they are in good agreement with NOESY NMR data. The results obtained by this combined NMR and molecular modelling approach suggest a new model for the transition state of alkaloid‐catalyzed addition of aromatic thiols to 2‐cyclohexenone.
The gas‐phase thermolyses of di‐, tri‐ and tetrachloroethene in hydrogen between 828 and 1050 K
Authors: Manion Jeffrey A. , Louw Robert 
Published: September 2010

AbstractThe thermolyses in hydrogen of 3–6 vol. % of 1,1‐dichloroethene, (E)‐1,2‐dichloroethene, trichloroethene and tetrachloroethene have been examined in a tubular flow reactor at atmospheric pressure between 828 and 1068 K. Major products are HCl, lower chlorinated ethenes, ethyne, ethene, ethane and methane. Chlorinated benzenes, major products in the straight pyrolysis of these compounds, are formed in only small amounts, the reasons for which are discussed. Dechlorination occurs in part via a chain mechanism involving H‐atom addition and ipso substitution of Cl. A second route, molecular elimination of HCl, also occurs but appears to become less important for the more chlorinated substrates. At 880 K, addition of a H atom to the monochloro‐substituted carbon of C2HCl3 takes place ca. 8 × more rapidly than it does to the dichloro site. The hydrogen‐atom concentration is somewhat greater than that calculated from equilibrium dissociation of H2 and varies by a factor of ca. 4 for the various substrates. Differences in hydrogen‐atom concentration are larger at lower temperatures, apparently due to the presence of relatively unreactive radicals in some systems, which lead to increased chain termination.
Studies on the micellar behaviour of praseodymium soaps
Authors: Mehrotra K. N. , Sharma Meera , Gahlaut A. S. 
Published: September 2010

AbstractColourimetric and magnetic measurements show that praseodymium soaps are ionic in nature and that the praseodymium ions are in trivalent state. Viscosity and colourimetric results show that the soap molecules do not aggregate below the CMC. Viscosity results have been interpreted in the light of well known equations proposed by Einstein, Vand, Moulik and Jones‐Dole.
An ESR study on electron‐capture phosphorus‐centred radicals in solid matrices of alkyl/phenyl phosphine sulfides and selenides
Authors: Aagaard Olav M. , Janssen René A. J. , Buck Henk M. 
Published: September 2010

AbstractA low‐temperature ESR study on electron‐capture radicals in X‐irradiated alkyl/ phenylphosphine chalcogenides is presented. In general, exposure of solid R(3‐n)Phn PX derivatives (R = alkyl, Ph = phenyl, X = S, Se, n = 1, 2) to X‐rays gave ESR spectra assigned to the corresponding radical anions, in which the unpaired electron is located in an antibonding P‐X σ* orbital. For two of the compounds studied (Me2PhPSe and MePh2PSe), however, no phosphoranyl radicals could be observed. For methylphenyl‐n‐propylphosphine selenide, a single‐crystal ESR analysis of the σ* radical anion is presented, giving detailed information on its electronic and geometric structure. It is found that the unpaired electron resides in a PSe anti‐bonding σ* orbital, whose direction almost parallels the parent PSe bond. Aspects of radiation damage mechanisms and phosphoranyl radical formation in phosphine chalcogenides are discussed.
Dinuclear copper(I) benzoato quinoline complexes as intermediates in the copper‐quinoline decarboxylation reaction
Authors: Aalten Henk L. , van Koten Gerard , Tromp Jeroen , Stam Casper H. , Goubitz Kees , Mak Arjen N. S. , van der Kerk‐van Hoof Anca 
Published: September 2010

AbstractThe reaction of both the novel mixed trinuclear organo‐organic copper(I) species [Cu3(C6H2Me3‐2,4,6)(μ‐O2CC6H5)2] (1) and [Cu(μ‐O2CC6H5)]4 (2a) with quinoline in toluene or diethyl ether yields the dimeric 1:2 copper/quinoline complex [Cu(μ‐O2CC6H5)(NC9H7)2]2 (3a). The reactions of methyl‐substituted copper(I) benzoates, [Cu(μ‐O2CC6H4Me‐x)]4 (x = 2, 2b; x = 3, 2c; x = 4, 2d), with quinoline in toluene or diethyl ether, however, afford the 1:1 copper/quinoline complexes [Cu(μ‐O2CC6H4Me‐x)(NC9H7)]2 (x = 2, 4b; x = 3, 4c; x = 4, 4d).The structure of complex 4b, determined by a single‐crystal X‐ray diffraction study, shows a dicopper(I) unit doubly bridged by two benzoato units [Cul…Cul* = 2.667(1) Å]. At each copper site, the CuO bonds to the bridging benzoato groups differ considerably [Cul‐Ol = 1.923(5) Å; Cul‐O2* = 2.134(5) Å]. Coordination of a quinoline at each copper site [Cul‐Nl = 1.952(5) R] produces a distorted trigonal arrangement.Crystallization of the 1:2 copper‐quinoline complex 3a led to formation of crystals of the dimeric 1:1 copper/quinoline complex [Cu(μ‐O2CC6H5)(NC9H7)]2, 4a. The structure of 4a is similar to that of 4b [Cul…Cul* = 2.638(2) Å Cul‐Ol = 1.945(6) Å Cul‐O2* = 2.107(6) Å Cul‐Nl = 1.939(7) Å]. Since complexes 3 and 4 can be expected to be similar to the intermediates formed in the copper‐quinoline decarboxylation reaction, the reactivity of 3 and 4 at elevated temperatures in non‐coordinating solvents has been studied. It was found that the decarboxylation reaction requires more than one equivalent of quinoline per copper atom. An improved mechanism is presented for the copper‐quinoline decarboxylation reaction involving dinuclear copper(I) complexes as intermediates.