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he is now Sterling Professor Emeritus of Chemistry. His research group has studied the mechanisms of organic reactions and has synthesized molecules designed to stimulate theoretical investigation.

Biradicals are even-electron molecules that have one bond less than the number permitted by the standard rules of valence. They are frequently invoked as fleeting intermediates in thermal and photochemical reactions. Efforts, largely by inferential methods, to detect them and to describe their properties occupy a central position in current mechanistic research.The work to be reported here originated in the hope that the chemistry of a special kind of biradical, trimethylenemethane (TMM),1,2 might be elucidated directly and that such studies might thereby sharpen

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