K. Kanematsu et al., REGIOSELECTIVE ALKYLATION OF 5-SUBSTITUTED BENZOSULFOLENES - SOME COMMENTS FOR ITS REGIOSELECTIVITY, Heterocycles, 38(1), 1994, pp. 41-44
Direct alkylation of the 5-substituted benzosulfolenes gave exclusivel
y 3-alkylated 5-substituted benzosulfolenes. The regioselectivity was
discussed in terms of the frontier molecular orbital theory.