Heteropoly Acids as Heterogeneous Catalysts for Thioacetalization and Transthioacetalization Reactions
作者:Habib Firouzabadi、Nasser Iranpoor、Kamal Amani
DOI:10.1055/s-2002-19300
日期:——
Heteropoly acids are effective solid catalysts for the thioacetalization of carbonyl compounds. Tungstophosphoric acid (H 3 PW 1 2 O 4 0 ), was found to be an effective and a highly selective catalyst for the thioacetalization of aldehydes, ketones and for the transthioacetalization of acetals, acylals and O,S-acetals which proceeded in excellent yields in the absence of solvent. The catalyst has also been
Promotion of 1,3-dithiolanes using a bentonitic clay as catalyst
作者:J. M. Aceves、G. A. Arroyo、Y. M. Vargas、R. Miranda、A. Cabrera、F. Delgado
DOI:10.1002/hc.10215
日期:——
The reactions between 1,2-ethandithiol with several carbonylic compounds to form the corresponding 1,3-dithiolanes were performed using a natural clay as promotor. The target molecules are used as reagents to obtain fine chemicals, herbicides, fungicides, and pharmaceutical compounds among others applications. A kinetic study of camphorquinone and 1,2-ethandithiol showed a first-order dependence with