Ws. Jenks et al., PHOTOCHEMISTRY OF DIBENZOTHIOPHENE-S,S-DIOXIDE - REACTIONS OF A HIGHLY CONSTRAINED BIRADICAL, Tetrahedron letters, 35(39), 1994, pp. 7155-7158
Photolysis of dibenzothiophene sulfoxide in isopropanol provides biphe
nyl in quantitative yield via two sequential photochemical reactions.
Mechanistic aspects of the reaction are discussed, including the unusu
al observation that isoprene increases the quantum yield of loss of st
arting material.