Cyclization of Olefinic Benzyl Ethers with Aryltellurium Trichlorides
作者:J. V Comasseto、M. V. A. Grazini
DOI:10.1080/00397919208020859
日期:1992.3
Abstract Olefinic benzyl ethers react with aryltellurium trichlorides leading to tetrahydrofurans in high yields. The reaction times and yields are similar to the analogous cyclization of the corresponding olefinic alcohols. The stereoselec-tivity of the transformation is low.
Influence of Alkoxy Groups on Rates of Acetal Hydrolysis and Tosylate Solvolysis: Electrostatic Stabilization of Developing Oxocarbenium Ion Intermediates and Neighboring-Group Participation To Form Oxonium Ions
作者:Angie Garcia、Douglas A. L. Otte、Walter A. Salamant、Jillian R. Sanzone、K. A. Woerpel
DOI:10.1021/acs.joc.5b00338
日期:2015.5.1
that do not have an alkoxy group. Rate accelerations are largest when the two functional groups are linked by a flexible cyclic tether. When controlled for the inductive destabilization, an alkoxy group can accelerate acetal hydrolysis by up to 200-fold. The difference in rates of acetal hydrolysis between a substrate where the alkoxy group was tethered to the acetal group by a five-membered ring compared