Addition of thianthrene cation radical to non-conjugated dienes—Part I: Addition to one double bond.

Reaction of thianthrene cation radical tetrafluoroborate and hexafluorophosphate with an excess of 1,4-hexadiene, 1,5-hexadiene, 1,7-octadiene, 1,8-nonadiene and 1,9-decadiene gave, in each case, a mixture of bis- and monoadduct from addition to one of the diene’s double bonds. Addition to both double bonds did not occur. The monoadduct of each diene and the bisadduct (7a) of 1,5-hexadiene were isolated. All monoadducts and 7a were characterized with 1 H and 13 C NMR spectroscopy. By reaction on activated alumina adducts were converted into ( E )- and ( Z )-(5-thianthreniumyl)dienes, all of which were characterized with 1 H and 13 C NMR spectroscopy. The monoadduct (6a) of 1,4-hexadiene and the bisadduct 7a were characterized with X-ray crystallography. [ABSTRACT FROM AUTHOR]