An Effective Synthesis of Angular Tricyclic Compounds Having Two Contiguous Quaternary Centers by Intramolecular Pauson-Khand reaction of Exocyclic Enynes

Abstract
Intramolecular Pauson-Khand reaction of various alkynyl exo-alkylidene-cyclohexanes and pentane gave angular type 6-5-5 and 5-5-5 tricyclic compounds bearing two contiguous quaternary centers in moderate to high yield.

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