An Efficient Method for the Synthesis of Acylals from Aldehydes under Solvent‐Free Conditions Catalyzed by Antimony Trichloride
作者:Asish K. Bhattacharya、Mohammad Mujahid、Arvind A. Natu
DOI:10.1080/00397910701651284
日期:2007.12.1
Abstract A mild and efficientmethod has been developed for the preparation of acylals from aldehydes catalyzed by antimony trichloride undersolvent‐freeconditions in very good to excellent yields. The easy availability, low cost, and ease of handling of the catalyst make this procedure especially attractive for large‐scale synthesis.
Cobalt(II)-catalyzed reaction of aldehydes with acetic anhydride under an oxygen atmosphere: scope and mechanism
作者:Beena Bhatia、T. Punniyamurthy、Javed Iqbal
DOI:10.1021/jo00072a041
日期:1993.9
The reaction of aldehydes with acetic anhydride in the presence of catalytic cobalt(II) chloride under an oxygen atmosphere at ambient temperature is dependent upon the reaction medium. Aliphatic aldehydes react in acetonitrile to give 1,2-diones whereas the aromatic aldehydes are acylated to yield the corresponding acylals. On the other hand, carboxylic acids are obtained from aliphatic and aromatic aldehydes by conducting the reaction in dichloroethane or benzene. Cobalt(II) chloride in acetonitrile catalyzes the conversion of aliphatic aldehydes to the corresponding anhydrides in the absence of acetic anhydride whereas aromatic aldehydes remain largely unaffected under these conditions. A preliminary mechanistic study in three different solvents (i.e. acetonitrile, dichloroethane, and DMF) has revealed that in acetonitrile and in the presence of acetic anhydride, aliphatic aldehydes behave differently than aromatic aldehydes. Some trapping experiments using methyl acrylate and stilbene have been conducted to demonstrate the occurrence of an acyl cobalt and peroxyacyl cobalt intermediate during these reactions.
Zur Synthese der Homoisovanillinsäure
作者:H. W. Bersch
DOI:10.1002/ardp.19392770606
日期:——
ACTION OF BROMINE ON VANILLIN, ISOVANILLIN, AND SOME OF THEIR DERIVATIVES, AND MODIFICATION OF THE DIRECTIVE INFLUENCE OF HYDROXYL IN THESE COMPOUNDS
作者:L. CHAS. RAIFORD、MELVILLE F. RAVELY
DOI:10.1021/jo01208a017
日期:1940.3
Niu, Hongying; Zhang, Xinying; Guo, Haiming, Journal of Chemical Research, 2004, # 11, p. 764 - 765