Showing papers by "Samir Z. Zard published in 1989"
TL;DR: On irradiation with visible light, primary and secondary xanthic anhydrides undergo a radical chain reaction to give the corresponding xanthates with loss of carbon oxysulphide as discussed by the authors.
32 citations
TL;DR: In this article, the sulphine group can be cleaved to the 23-ketone in high yield using a variety of oxidising agents such as ozone, sodium hypochlorite, hydrogen peroxide or dinitrogen tetroxide or alternatively by exposure to acetic anhydride-sulphuric acid.
20 citations
TL;DR: Geminal (pyridine-2-thiyl) phenylsulphones, obtained by decarboxylative radical addition of O-acyl derivatives of N-hydroxy- 2-thiopyridone onto phenyl vinyl sulphone, undergo a wide variety of further transformations when subjected to sodium telluride or to organoaluminum reagents as discussed by the authors.
12 citations
TL;DR: In this article, the secondary and tertiary allylic nitro compounds are heated to give the corresponding rearranged allylic alcohols in moderate to good yield, and the resulting rearranged alcohols can be used to produce a good yield.
Abstract: Heating secondary and tertiary allylic nitro compounds gives the corresponding rearranged allylic alcohols in moderate to good yield.
9 citations
01 Jan 1989
TL;DR: In this article, the reaction sequence can be initiated with visible light if small amounts of S-benzoyl-O-ethyl xanthate are incorporated into the medium.
Abstract: Alkyl and acyl xanthates are useful precursors of alkyl and acyl radicals. With acyl xanthates, the radical chain process can be initiated by visible light, and capture of the intermediate acyl radical leads to various carbonyl derivatives. In some cases, the acyl radical extrudes carbon monoxide to give an alkyl radical which in turn can be trapped by an electrophilic olefin. Alkyl xanthates in contrast require U.V. lighting but the reaction sequence can sometimes be initiated with visible light if small amounts of S-benzoyl-O-ethyl xanthate are incorporated into the medium.
1 citations