Reactions of lead tetra-acetate. Part XI. The oxidation of styrene
作者:R. O. C. Norman、C. B. Thomas
DOI:10.1039/j29670000771
日期:——
Styrene reacts with leadtetra-acetate to give at least four products, PhCH(OAc)Et, PhCH(OAc)·CH2OAc, PhCH2·CH(OAc)2, and PhCHO. The relative yields of the first three are strongly dependent on the conditions of the reaction. A systematic study of these variations, together with kinetic evidence, has shown that the first product results from a radical-chain reaction and the third from a heterolytic
Poly(4-vinylpyridinium) perchlorate as an efficient solid acid catalyst for the chemoselective preparation of 1,1-diacetates from aldehydes under solvent-free conditions
作者:Nader Ghaffari Khaligh
DOI:10.1016/s1872-2067(12)60750-5
日期:2014.3
Abstract Poly(4-vinylpyridinium) perchlorate has been used as a supported, recyclable, environmentally-benign catalyst for the formation of acylals from aliphatic and aromatic aldehydes in good to excellent yields under solvent-free conditions. Notably, the reaction conditions were tolerant of ketones. This methodology offers several distinct advantages, including its operational simplicity and high
A succinimide-N-sulfonic acid catalyst for acetylation reactions in absence of a solvent
作者:Farhad SHIRINI、Nader Ghaffari KHALIGH
DOI:10.1016/s1872-2067(11)60499-3
日期:2013.4
Abstract A small amount of succinimide-N-sulfonic acid efficiently catalyzed the acetylation of a variety alcohols, phenols, thiols, amines and aldehydes with acetic anhydride at room temperature under solvent free conditions. This catalyst has the advantages of excellent yields and short reaction times and the reaction can be carried out on a large scale, which makes it potentially useful for industrial
The reactions of styrene and trans-β-methylstyrene with lead tetraacetate in acetic acid are greatly influenced by ultrasonic irradiation to give products resulting mostly from radical chain pathways, whereas mechanical agitation gives products only from ionic processes.
2,4,4,6-Tetrabromo-2,5-cyclohexadienone (TABCO) as a Versatile, Efficient, and Chemoselective Catalyst for the Acetalization and Transacetalization of Carbonyl Compounds, the Preparation of Acetonides from Epoxides and Acylals (1,1-Diacetates) from Aldehydes
The efficient and chemoselective preparation of acetals and ketals from carbonyl compounds, transacetalization reactions, the conversion of epoxides to acetonides, and the preparation of acylals from aldehydes in the presence of catalytic amounts of 2,4,4,6-tetrabromo-2,5-cyclohexadienone (TABCO) are described.