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Title:Part I. Solvolysis of Caryophyllen-8-Yl Derivatives: Model Reactions for Presilphiperfolanol Biogenesis. Part II. Stereochemistry of Lithium-Amine Reductions of Tetrasubstituted Epoxides and Phenylthiohydrins to Tertiary Alcohols
Author(s):Shankar, Sriram
Doctoral Committee Chair(s):Coates, R.M.
Department / Program:Chemistry
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Chemistry, Organic
Abstract:A comparative study of the Li-amine reductions of model bicyclic tetrasubstituted epoxides and the corresponding trans-phenylthiohydrins was carried out to determine the stereochemistry and optimal reaction conditions for this transformation. Octalin, hydrindene, and bicyclo (3.3.0) octene epoxides were synthesized, and the product ratios from their reductions in NH$\sb3$ and EtNH$\sb2$ were determined and compared with those in ethylenediamine reported in the literature. Li-NH$\sb3$ reductions gave best selectivities. Li-EtNH$\sb2$ reductions were faster than Li-NH$\sb3$ reductions, and they showed selectivities comparable to those with Li-ethylenediamine reported. trans-1,2-Phenylthiohydrins of octalin, hydrindene, and bicyclo (3.3.0) octene were synthesized by ring opening of the corresponding epoxides with Et$\sb2$AlSPh. The reductions of the phenylthiohydrins and their respective phenylthioalkoxides were carried out in Li-NH$\sb3,$ and the product ratios were determined. The potential for regioselective ring opening of epoxides combined with the ease of reduction of phenylthiohydrins, and the selectivity of Li-amine reductions to give a thermodynamic distribution of alcohols makes this method very appealing.
Issue Date:1997
Description:212 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1997.
Other Identifier(s):(MiAaPQ)AAI9812766
Date Available in IDEALS:2015-09-25
Date Deposited:1997

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