Reactivity of Substituted Thiophenes toward Tris(triethylphosphine)platinum(0), -palladium(0), and -nickel(0)
Citations Over TimeTop 10% of 2001 papers
Abstract
The reactions of [M(PEt3)3] (M = Pt (1), Pd (2), Ni (3)) with 3-chlorothiophene, 2-chlorothiophene, 3-nitrothiophene, 2-nitrothiophene, 2-methoxythiophene, 3-methoxythiophene, 2-acetylthiophene, and 3-acetylthiophene afforded thiaplatinacycles of the type [(Et3P)2M(C,S-C4H3RS)], (for M = Pt, R = Cl (4 and 5), NO2 (6 and 7), MeO (8 and 9), Ac (10 and 11); for M = Pd, R = Cl (12 and 13), NO2 (14), MeO (15 and 16), Ac (17 and 18), for M = Ni, R = Cl (19)). When 3 and 2-chlorothiophene were reacted, another compound resulting from the oxidative addition of the C−Cl bond could be isolated, with the formulation [(Et3P)2Ni(Cl)(η1-T)] (20). Additionally the reaction of 3 with 2-nitrothiophene produced a compound derived from a C−H activation reaction, [(Et3P)2Ni(H)(η1-NO2T)] (21). The thiaplatinacycles 8−11 were shown to be active intermediates in HDS reactions, under catalytic conditions, to give 81 cycles at 300 psi, 100 °C in THF, in the presence of metallic mercury. Crystal structures are reported for 4 and 7.
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