Bulletin of the Chemical Society of Japan p. 1254 - 1257 (1994)
Update date:2022-08-11
Topics:
Itagaki, Hiroaki
Murayama, Hiroki
Saito, Yasukazu
Catalytic cyclohexane dehydrogenation, yielding cyclohexane and dihydrogen, proceeded under photoirradiation on either a three-coordinated complex, RhCl(PCy3)2 (Cy = cyclohexyl), or a dihydride complex, RhClH2(PCy3)2, with almost the same turnover frequencies (8.4 or 8.6, respectively) attained by use of a cut-filter (UV-27) under refluxing conditions (354 K).RhCl(PCy3)2 in cyclohexane gave stoichiometric amounts of cyclohexene and RhClH2(PCy3)2 at 354 K; the latter complex yielded little H2 even at 373 K in toluene.A photocatalysis cycle for cyclohexane dehydrogenation with RhCl(PCy3)2 is proposed, where cyclohexene is yielded by thermal C - H bond dissociation and dihydrogen is photoeliminated from RhClH2(PCy3)2, regenerating the original complex.
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