Carbene complexes. Part 11. Steric and conformational effects upon the transition-metal reactivity of electron-rich olefins and derived species; heteroatom-donor-olefin–metal (Cr<sup>0</sup>, Mo<sup>0</sup>, W<sup>0</sup>, or Rh<sup>I</sup>) and 2-imidazoline-N-donor–metal complexes, and the crystal and molecular structure of tetracarbonyl[NN′N″N‴-tetramethylbi(imidazolidin-2-ylidene)-NN″]-chromium(<scp>0</scp>)
作者:Peter B. Hitchcock、Michael F. Lappert、Peter L. Pye
DOI:10.1039/dt9770002160
日期:——
The related olefins [:[graphic omitted]Me]2(L′Me2) and [:C(NMe2)2]2(tdae) do not afford carbene complexes with Cr0. From [M(CO)4(bhd)](M = Cr, MO, or W; bhd = bicyclo[2.2.1]hepta-2,5-dtene) each of the three olefins readily affords heteroatom-donor-olefln species [M(CO)4(olefin-NN″)]. For M = MO, the latter is transformed thermally into the N′N″-carbenemolybdenum complexes, only for olefin = LMe2, but
富电子烯烃[:[省略图示] R] 2,L R 2,(R = Me或Et)与(a)[Cr(CO)6 ]热反应,形成[Cr(CO)5 L R ] [(1)或(2)]或顺式-[Cr(CO)4(L R 2),] [(3)或(4)]或(b)[Cr(η- C6 H 6)( (CO)3 ],得到[Cr(η- C6 H 6)(CO)2 L Me ],(5):[Cr(CO)5 L Me ],(1),形成混合的配体配合物顺式-[铬(AsPh 3)(CO)4 L Me ],(6)或顺式-[Cr(CO)4 C(OMe)Me} L Me ],(7),先用AsPh 3或LiMe然后再用MeOSO 2 F处理,分别。相关的烯烃[:[未图示] Me] 2(L' Me 2)和[:C(NMe 2)2 ] 2(tdae)不能提供具有Cr 0的卡宾络合物。从[M(CO)4(bhd)](M = Cr,MO或W; bhd =双环[2