There are disclosed a composition comprising (E)-1,4-dibromo-2-methyl-2-butene and (Z)-1,4-dibromo-2-methyl-2-butene, wherein the ratio of the E isomer to the total amount of the E and Z isomers is 0.9 or more; a process for producing the same and a proce
-
(2008/06/13)
γ-lactone formation in the addition of benzenesulfonyl bromide to diene and enyne esters
The gem-dialkyl effect has been used to promote the formation of functionalized γ-lactones in the addition of benzenesulfonyl bromide to diene and enyne esters. Introduction of 3 tool % of pyridine into the reactions increases the yields of lactones produced from tertiary esters. Formation of the C(α)-C(β) bond of γ-lactones has been achieved in both C(α)→C(β) and Cβ→C(α) radical cyclization directions.
Wang, Chen,Russell, Glen A.
p. 2066 - 2069
(2007/10/03)
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