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2005
Thiophene derivatives
R 0090
Alkatrienyl Sulfoxides and Sulfones. Part 6. Cheletropic Addition of Sulfur Dioxto 1- and 3-Vinylallenyl Sulfoxides and Sulfones. — The potential of cycloaddi08- 104 ide
tion reactions of vinylallenyl sulfoxides and sulfones is enlarged by cheletropic addition of sulfur dioxide to 1- and 3-vinylallenyl sulfones (I) and (V) and sulfoxides (III)
and (VII) to selectively construct exocyclic double bond on six- or five-membered
rings. The reaction conditions with respect to the solvent are optimized. —
(CHRISTOV*, V. C.; IVANOV, I. K.; Heterocycles 63 (2004) 10, 2203-2206; Dep.
Chem., Univ. Shumen, BG-9700 Shumen, Bulg.; Eng.) — H. Hoennerscheid
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