Alumina-supported Molybdenum (VI) Oxide: An Efficient and Recyclable Heterogeneous Catalyst for Regioselective Ring Opening of Epoxides with Thiols, Acetic Anhydride, and Alcohols under Solvent-free Conditions
作者:Sweety Singhal、Suman L. Jain、Bir Sain
DOI:10.1246/cl.2008.620
日期:2008.6.5
An efficient and simple protocol for regioselective ring opening of epoxides with thiols, aceticanhydride, and alcohols using 16 wt % MoO3 supported on alumina as a recyclable catalyst is described.
ZEOLITE CATALYZED RING OPENING OF EPOXIDES TO ACETYLATED DIOLS WITH ACETIC ANHYDRIDE<sup>*</sup>
作者:P. Ramesh、V. L. Niranjan Reddy、D. Venugopal、M. Subrahmanyam、Y. Venkateswarlu
DOI:10.1081/scc-100105384
日期:2001.1.1
HY Zeolite is found to be a versatile catalyst for opening of epoxides to the corresponding acetylated 1,2-Diols with acetic anhydride in good yields. *IICT Communication No. 4521.
发现 HY 沸石是一种通用催化剂,用于将环氧化物以良好的收率与乙酸酐开环成相应的乙酰化 1,2-二醇。*IICT 通讯第 4521 号。
Bu<sub>3</sub>SnH-Mediated Pinacol Coupling of 1,5- and 1,6-Dicarbonyl Compounds: Synthetic and Mechanistic Studies
作者:David S. Hays、Gregory C. Fu
DOI:10.1021/jo9809130
日期:1998.9.1
distinguishes the pinacol cyclization from other reductive cyclizations of tin ketyls, all of which proceed through abstraction of hydrogen from Bu(3)SnH in the final step. An interesting consequence of the S(H)2 pathway is very high cis selectivity in the cyclization of 1,5-dicarbonyl compounds. Mechanistic studies furnish evidence that the steps that precede homolytic substitution, including C-C bond formation
Mild Organic Ammonium Tribromide–Mediated Regioselective Ring Opening of Epoxides with Alcohols, Water, Acetic Anhydride, and Amines Under Solvent-Free Reaction Conditions
作者:Sweety Singhal、Suman L. Jain、Bir Sain
DOI:10.1080/00397911.2010.493259
日期:2011.5.4
Abstract Organic ammonium tribromide (OATB), N-methylpyrrolidine-2-one hydrotribromide (MPHT) was found to be an efficient catalyst for the regioselective ring opening of epoxides with various nucleophiles under solvent free conditions. This procedure occurs under neutral and mild reaction conditions with out adding any additive and afforded high yields of products.
Acid-Catalyzed Oxidation of Olefins with Selenium Dioxide
作者:Khan A. Javaid、Noboru Sonoda、Shigeru Tsutsumi
DOI:10.1246/bcsj.43.3475
日期:1970.11
A drastic deviation from the usually accepted reaction path was observed when oxidation of olefins was carried out in acetic acid with selenium dioxide in the presence of concentrated sulfuric acid. Oxidation of cyclohexene gave a mixture of cis- and trans-1,2-diacetoxycyclohexane. It was shown that in the oxidation of cyclohexene the organoselenium intermediate which produced 3-acetoxy-1-cyclohexene