“…Baldwin and Fleming (1970) have presented detailed arguments that serve to distinguish energetically concerted reactions (Woodward and Katz, 1959;Doering et al, 1972) from those which are bondingly concerted in a molecular orbital sense (Salem, 1968;Silver, 1974) (i.e., reactions in which the bonding character of interacting molecular orbitals is preserved throughout the transformation). Berson (1972;Berson and Salem, 1972;Berson and Holder, 1973) and other investigators (Salem, 1970;Baldwin and Grayston, 1974) have presented examples of symmetry forbidden, concerted reactions. Berson (1972;Berson and Salem, 1972;Berson and Holder, 1973) and other investigators (Salem, 1970;Baldwin and Grayston, 1974) have presented examples of symmetry forbidden, concerted reactions.…”