The invention of new radical chain reactions. Part VIII. Radical chemistry of thiohydroxamic esters; A new method for the generation of carbon radicals from carboxylic acids
作者:Derek H.R. Barton、David Crich、William B. Motherwell
DOI:10.1016/s0040-4020(01)97173-x
日期:1985.1
by tributylstannane in a radicalchainreaction to furnish nor-alkanes.1 In the absence of the stannane a smooth decarboxylatlive rearrangement occurs to give 2-substituted thiopyridines.1 The radicals present in this reaction provoke with -butylthiol an efficient radicalreaction with formation of nor-alkane and 2-pyridyl--butyl disulphide.1Similarly these carbon radicals can be captured by halogen
New and improved methods for the radical decarboxylation of acids
作者:Derek H. R. Barton、David Crich、William B. Motherwell
DOI:10.1039/c39830000939
日期:——
Carboxylic acid esters derived from N-hydroxypyridine-2-thione undergo efficient radical chain decarboxylation to the corresponding nor-alkane on treatment with either tri-n-butylstannane or t-butylmercaptan; in the absence of these hydrogen atom donors a smooth decarboxylative rearrangement giving noralkyl 2-pyridyl sulphides is observed.
The invention of radical reactions. Part XXVI. New thio- and seleno-hydroxamic acids; radical chemistry of their O-acyl derivatives.
作者:Derek H.R. Barton、Catherine Tachdjian
DOI:10.1016/s0040-4020(01)88250-8
日期:1992.1
New thio- and seleno-hydroxamic acids have been synthesized from various 4,4-disubstituted thiazolidine-2,5-dithiones. Their corresponding O-acyl derivatives rearrange photochemically, with visible light, in an identical manner to the acyl derivatives of N-hydroxy-2-thiopyridone. A wide range of half-lives was observed.
作者:Derek H.R. Barton、Dominique Bridon、Isabel Fernandaz-Picot、Samir Z. Zard
DOI:10.1016/s0040-4020(01)86878-2
日期:1987.1
Esters (mixed anhydrides) derived from aliphatic or alicyclic carboxylic acids (RCO2H) and thiohydroxamic acids or undergo a thermally or photochemically induced radical chain reaction to give sulphides with loss of carbon dioxide. On irradiation at low-temperature however, the chain reaction is essentially supressed. Under these conditions moderate to good yields of dimers R-R are obtained from primary
Radicals formed from the esters of thiohydroxamic acids readily add to electron deficient olefins to give adducts of potential synthetic value in variable yield. In certain cases the added sulphur function is easily eliminated with reformation of olefin.