Mechanistic Investigations of the Cycloaddition Reactions of Thioxanthenylidene S,S-Dioxide

A. A. Abdel-wahab, S. H. Doss, H. Dürr, N. J. Turro, I. R. Gould

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8 Scopus citations


Photolysis of 9-diazothioxanthene S,S-dioxide (9) in the presence of the substituted styrenes 11–15 gave the corresponding spirocyclopropane adducts 18–22 in high yield (67-86%), in addition to minor amounts of bi-9,9′-thioxanthenylidene S,S,S',S’-tetroxide (10). Laser flash photolysis of 9 produced a transient absorption (λmax324 nm) which was efficiently quenched by oxygen and was assigned to the carbene 2. This species was quenched by alcohols in a fast reaction attributable to the singlet state of 2, and in acetonitrile an ylide (24) was obtained. Quenching of 2 with the styrenes allowed the determination of the absolute rate constants for these reactions. The reactive spin state of 2 was investigated by studying the stereochemistry of the (1 + 2) cycloaddition of the carbene with trans-β-methylstyrene.

Original languageEnglish (US)
Pages (from-to)429-434
Number of pages6
JournalJournal of Organic Chemistry
Issue number3
StatePublished - Feb 1 1987
Externally publishedYes

ASJC Scopus subject areas

  • Organic Chemistry


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