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Showing papers on "Benzaldehyde published in 1985"


Journal ArticleDOI
TL;DR: Aldehydes undergo preferential allylation in the presence of ketones by the tin or zinc mediated method, easily effected in aqueous media as discussed by the authors, and they can be easily allylated by a metal-oxide mixture.

137 citations


Journal ArticleDOI
TL;DR: Synthese de benzylimines d'aldehydes et de cetones par reaction de benzaldehyde, cinnamaldehyde, acetaldehyde, etc..
Abstract: Synthese de benzylimines d'aldehydes et de cetones par reaction de benzaldehyde, cinnamaldehyde, acetaldehyde, acetophenone, benzophenone et acetone avec la benzylamine sur alumine en absence de solvant

87 citations



Journal ArticleDOI
01 May 1985-Fuel
TL;DR: In this article, Dibenzyl ether in water at 374, 401 and 412 °C resulted in rapid ether hydrolysis to benzyl alcohol, which in turn underwent significant secondary reactions to polymeric material.

67 citations


Journal ArticleDOI
TL;DR: In the presence of metallic bismuth, allyl halides were found to react with aldehydes under mild conditions to give the corresponding homoallylic alcohols in good yields.

62 citations


Journal ArticleDOI
TL;DR: The lithiated anion derived from 3,4,6-tri-O-t-butyldimethylsilyl-2-deoxy-α, β-D-gluco-pyranosyl phenylsulfones 1 reacts with various electrophiles leading to alkylated products, precursors of β -D-C-glycosides 5−g after stereocontrolled desulfonylation and hydrolysis.

61 citations


Journal ArticleDOI
TL;DR: In this article, three cross-aldol products are formed in good yields by treating tert-butyldimethylsilyl enol ethers with aldehydes in the presence of a catalytic amount of trityl perchlorate.
Abstract: Threo cross-aldol products are predominantly formed in good yields by treating tert-butyldimethylsilyl enol ethers with aldehydes in the presence of a catalytic amount of trityl perchlorate.

57 citations


Journal ArticleDOI
TL;DR: Alumina was found to be an effective and convenient catalyst for acetalization of aldehydes to the corresponding 1,3-dioxoranes and 1, 3 -dioxanes and can be used for selective protection of only formyl group of ketoaldehydes.

45 citations


Journal ArticleDOI
TL;DR: In this article, it was shown that E-enol borates exist in an U-conformation 7a, whereas Z-enols should prefer the extended conformation 8b.

41 citations


Journal ArticleDOI
TL;DR: Les alcyne-1'yl-9 bora-9bicyclo [4.1.0] nonanes permettent de faire la distinction entre les aldehydes and cetones plus ou moins encombres steriquement.
Abstract: Les alcyne-1'yl-9 bora-9bicyclo [4.1.0] nonanes permettent de faire la distinction entre les aldehydes et cetones plus ou moins encombres steriquement

31 citations


Journal ArticleDOI
TL;DR: In this paper, a 2-Trimethylsilylmethylenecyclopropane (=3) was synthesized by reaction of lithio methylenecysyclopsropane with TMSCl, and it was shown that the lithium salt reacts with some electrophiles by α or γ-attack depending on the nature of the electrophile.

Journal ArticleDOI
TL;DR: In this article, the 4-phenyldihydropyridazinone was obtained from phenylacetic acid by three simple stages, and was shown to be stable in the presence of hydrazine or cyclohexene.
Abstract: Efficient preparations of 4- and 5-phenyl-4,5-dihydropyridazin-3(2H)-ones have been developed, the main reactions of these compounds have been studied, and the synthetic routes have been used to give analogues with substituents in the phenyl rings.In the best synthesis of the 4-phenyldihydropyridazinone (72% overall yield) the product was obtained from phenylacetic acid by three simple stages. This approach was applied in preparations of the 2- and 4-hydroxyphenyl compounds and, in conjunction with a recent method for amine protection, the 4-aminophenyl analogue. A four stage synthesis starting from benzaldehyde gave the 5-phenyl-dihydropyridazinone in 47% overall yield; hydroxybenzaldehydes were similarly converted into 5-(allyloxyphenyl)dihydropyridazinones.Oxidation to phenylpyridazinones occurred more readily with the 4- and 5-phenyldihydropyridazin-ones than with the 6-phenyl isomer. The 4- and 5-dihydropyridazinones were smoothly reduced to tetrahydropyridazinones by hydrogenation over platinum but were unaffected by palladium in the presence of hydrazine or cyclohexene.

Journal ArticleDOI
TL;DR: In this article, a reaction de transfert d'electron en utilisant le radical methoxy-4 tetramethyl-2,2,6,6 piperidinoxyle comme mediateur is described.

Journal ArticleDOI
TL;DR: In this paper, the authors proposed a (N-methyl N-trimethylsilyl O-trIMethylsililyl) hydroxylamine (HLSO) for the formation of amines.
Abstract: Formation d'oxydes d'(alkylidene methyl) amines par reaction d'aldehydes ou de cetones avec la (N-methyl N-trimethylsilyl O-trimethylsilyl) hydroxylamine

Journal ArticleDOI
TL;DR: The reaction of a THF solution of a tolane complex of titanocene [Cp2Ti(C2Ph2)] with benzaldehyde and acetone results in the formation of titanadihydrofuran metallacycles as discussed by the authors.

Journal ArticleDOI
TL;DR: Amine oxides, 1, 5, 10, 15, 21, 23, when treated by lithium diisopropylamide undergo deprotonation, giving rise either to secondary amines and benzaldehyde resulting from the hydro...
Abstract: Amine oxides, 1, 5, 10, 15, 21, 23, when treated by lithium diisopropylamide undergo deprotonation. Monodeprotonation gives rise either to secondary amines and benzaldehyde resulting from the hydro...

Journal ArticleDOI
TL;DR: In this paper, the pre-selective preparation of l- or u-Aldols from trityl ketone and aromatic aldehydes through lithium and aluminium enolates is discussed.
Abstract: Selective Preparation of l- or u-Aldols from Ethyl Trityl Ketone and Aromatic Aldehydes through Lithium and Aluminium Enolates, Respectively The ethyl trityl ketone (1) is deprotonated to the (Z)-enolate 2 which adds to aromatic aldehydes with relative topicity ul to give the aldols 3(−78°, THF, kinetic control). If, on the other hand, 1 is heated with trimethylaluminium in toluene, the aluminium enolate formed combines with aromatic aldehydes and with cinnamic aldehyde with opposite relative topicity (lk) to the aldols 5 (+20°, toluene, 2 d, precipitation of the aluminium aldolate 4, thermodynamic control). The mechanism is discussed (cf. Fig. 1). The adducts to benzaldehyde (3a, 5a), furfural (3f, 5f), and cinnamaldehyde (3i, 5i) are O-(2-methoxyethoxy)methyl (MEM) protected and cleaved by lithium triethylborohydride to the 1,3-diol derivatives 9–11 with a free primary and a protected secondary OH-group. Analogous conversions of 1 and other ketones may also be diastereoselective, but turned out to be of less preparative value (see 6–8, 12).


Journal ArticleDOI
TL;DR: Alkyl and allyl sulfones can be converted into boronic esters, oxidation of which leads to aldehydes or ketones as discussed by the authors, which can then be used to make aldehyde or ketone.

Journal ArticleDOI
TL;DR: On heating with benzaldehyde and alkenes, N-alkylamino acids derivatives lead to pyrrolidines as discussed by the authors, a class of N-alklamino acid derivatives.

Journal ArticleDOI
TL;DR: In this article, the reactif d'Emmons diethoxyphosphoryl, 3' acetonyl-3' hydroxy-4 R-1 pyrroline-3one-2 (R=dimethoxy-2,4 benzyl) a partir de N-R glycinate d'ethyle, de bromure de Bromo-4 acetoacetyl and de diethylphosphite de potassium Reactions d'aldehydes avec ce reactif
Abstract: Synthese du reactif d'Emmons diethoxyphosphoryl-3' acetonyl-3 hydroxy-4 R-1 pyrroline-3one-2 (R=dimethoxy-2,4 benzyl) a partir de N-R glycinate d'ethyle, de bromure de bromo-4 acetoacetyl et de diethylphosphite de potassium Reactions d'aldehydes avec ce reactif

Journal ArticleDOI
TL;DR: Par reaction du diisopropylamidure de lithium avec des fluoroacetamides, puis additionavec des aldehydes ou cetones, obtention d'alcools α-(fluorodialkylcarbamoyl) methyles as mentioned in this paper.
Abstract: Par reaction du diisopropylamidure de lithium avec des fluoroacetamides, puis addition avec des aldehydes ou cetones, obtention d'alcools α-(fluorodialkylcarbamoyl) methyles

Journal ArticleDOI
TL;DR: In this paper, 1,1'-diindazolylphenylmethanes have been prepared from indazoles and benzaldehyde in presence of zinc chloride as catalyst, which is strongly dependent on the basic pK a's of azoles and only few pyrazolyl derivatives could be prepared by this procedure.

Journal ArticleDOI
TL;DR: In this article, the effects of substituents on the chemical shifts of H-α and H-2′ protons were analyzed by the Hammett single parameter and Taft dual substituent parameter (DSP) techniques.
Abstract: Various 4- and 4′-substitued trans-N-benlizylidenanilines were synthesized and their 1H NMR spectra recorded at 30 °C in DMSO-d6, and acidic media (TFA-d and D2SO4). The effects of substituents on the chemical shifts of H-α (proton on carbon of imine group) and H-2′ (protons on benzaldehyde ring ortho to the imine group) were analysed by the Hammett single parameter and Taft dual substituent parameter (DSP) techniques. In the neutral solvent DMSO-d6, there is transmission of the electronic effects of substituents on the benzaldehyde ring to the H-α and H-2′ protons, but no electronic transmission for substituents on the aniline ring. There is a dramatic change in acid media. Protonation of the imine group results in significant electronic transmission from substituents on the aniline ring to the H-α and H-2′ protons, as well as an enbancement in electronic transmission from substituents on the benzaldehyde ring. DSP analysis indicates that both inductive and resonance factors are responsible for the observed electronic transmission effects, with resonance being the major factor.

Journal ArticleDOI
TL;DR: Etude stereochimique de la cyclocondensation d'aldehydes avec des alkyldimethylsiloxy-3 methoxy-«1» methyl-2 pentadienes-1,3 as discussed by the authors
Abstract: Etude stereochimique de la cyclocondensation d'aldehydes avec des alkyldimethylsiloxy-3 methoxy-«1» methyl-2 pentadienes-1,3

Journal ArticleDOI
TL;DR: In this article, Boroxazolidones derived from glycine and phenylalanine react with aromatic aldehydes to form the corresponding imines, and these reactions proceed via carboxylic acids via catalytic, hydrogenation.

Journal ArticleDOI
TL;DR: A 3,3′-tetramethylene-bridged 4-methylthiazolium salt was used in the reduction of nitrobenzene with benzaldehyde and triethylamine in methanol-water to give a nitrone as discussed by the authors.
Abstract: A 3,3′-tetramethylene-bridged 4-methylthiazolium salt catalyses the reduction of nitrobenzene with benzaldehyde and triethylamine in methanol–water to give a nitrone.

Journal ArticleDOI
TL;DR: In this paper, cyclohex-2-enylation of aldehydes, mediated with boron trifluoride etherate, involves γ-equatorial approach of the presumed aldehyde-Lewis acid adduct (RCHO-BF3), irrespective of starting stannane stereochemistry.
Abstract: Cyclohex-2-enylation of aldehydes, mediated with boron trifluoride etherate, involves γ-equatorial approach of the presumed aldehyde-Lewis acid adduct (RCHO-BF3), irrespective of starting stannane stereochemistry. Marginal threo selectivity characterizes homoallyl alcohol formation from benzaldehyde, whereas alkanals react with high erythro selectivity, so that 1-(1′-hydroxyalkyl)cyclohex-2-enes in this diastereomeric form are available based on allyltin chemistry.

Journal ArticleDOI
TL;DR: The addition of a mixture of benzaldehyde and BF 3 ·OEt 2 to crotyl-organometallic reagents C 4 H 7 MLn (1 ) (M = Cu, Cd, Hg, Tl, Ti, Zr and V) produces predominantly the erythro homoallyl alcohol as well as the α-adducts as mentioned in this paper.

Journal ArticleDOI
TL;DR: In this article, the regioselectivity of the reaction of organozinc compounds derived from γ-bromocrotonic and γbromosenecioic trimethylsilyl esters, with benzaldehyde is discussed.