Mechanisms for interconversions among C3H4 hydrocarbons: deuterium isotope effects and independent generation of vinylmethylene intermediates in photoisomerizations of allenes and cyclopropenes
The intramolecular reaction of acetophenone <i>N</i>-tosylhydrazone and vinyl: Brønsted acid-promoted cationic cyclization toward polysubstituted indenes
TsNHNH2, a Brønsted acid-promoted intramolecular cyclization of o-(1-arylvinyl) acetophenone derivatives was developed, leading to polysubstituted indenes with complexity and diversity in moderate to excellent yields. In sharp contrast with either the radical or carbene involved cyclization of aldehydic N-tosylhydrazone with vinyl, a cationiccyclization pathway was involved, where N-tosylhydrazone served
An efficient procedure for the synthesis of substituted indenes through the FeCl3 center dot 6H(2)O-catalyzed intramolecular Friedel-Crafts cyclization of aryl-substituted allylic alcohols has been developed. This method features the easily available starting materials, cheap catalyst, simple manipulation, and mild conditions. (C) 2009 Elsevier Ltd. All rights reserved.
Mechanisms for interconversions among C3H4 hydrocarbons: deuterium isotope effects and independent generation of vinylmethylene intermediates in photoisomerizations of allenes and cyclopropenes