摘要:
The reactions of (2-pyridyl)methylenecyclobutane with the metal fragments [OsTp((PPr3)-Pr-i)](+) and [OsCp((PPr3)-Pr-i)](+) (Tp = hydridotris(pyrazolyl)borate, Cp = cyclopentadienyl) are shown. Complex [OsTp(kappa(1)-OCMe2)(2)((PPr3)-Pr-i)]BF4 (1) reacts with the organic substrate to give [OsTp{eta(2)-C(CH2CH2CH2)=CH-C5H4N}((PPr3)-Pr-i)]BF4 (2), which evolves into the cyclopentylidene derivative [[OsTp(=CCH2CH2CH2CH-C5H4N)((PPr3)-Pr-i)]BF4 (3) as a result of the ring expansion of the methylenecyclobutane unit Idle coordinated substrate. The reaction of (2-pyridyl)methylenecyclobutane with [OsCp(NCCH3)(2)((PPr3)-Pr-i)]PF6 (4) leads to [OsCp{eta(2)-C(CH2CH2CH2)=CH-C5H4N}((PPr3)-Pr-i)]PF6 (5). In contrast to 2, complex 5 evolves by means of exo endo isomcrization of the C-C double bond of the coordinated substrate to afford [[OsCp(eta(2)-C(=CH2CH2CH2)-CH2-C5H4N)((PPr3)-Pr-i)]PF6 (6).