摘要:
The reaction of [(ArO)2Zr(Me)2] (ArO = 2,6-di-tert-butylphenoxide) with PhNHNHPh (1 equiv) leads to [(ArO)2Zr(Me)(eta2-NPhNHPh)] (1) and 1 equiv of methane. Heating a C6D6 solution of 1 generates [Zr{OC6H3(Bu(t))C(CH3)2CH}(OAr)(NPhNHPh)] (2) via cyclometalation of a tert-butyl group of the aryloxide ligand (H-1 NMR). Addition of 4-pyrrollidinopyridine (>2 equiv, py) to 1 results in the formation of the eta2-azobenzene complex [(ArO)2Zr(eta2-N2Ph2)(py')2] (3) with the elimination of methane. Solutions of 3 in C6D6 Slowly convert to the terminal imido complex [(ArO)2Zr(=NPh)(py')2] and free azobenzene. Reaction of 1 with organic isocyanides (1 equiv of RNC; R = Bu(t), 2,6-Me2C6H3) produces a mixed hydrazido, iminoacyl complex [(ArO)2Zr(eta 2-NPhNHPh)(eta2-MeCNR)], R = Bu(t) (4a), 2,6-Me2C6H3 (4b). Compound 4a crystallizes in space group P2(1)/c with a = 19.666(5) angstrom, b = 12.166(3) angstrom, c = 19139(3) angstrom, beta = 108.01(2)degrees, and Z = 4. The solid state structure of 4a shows both the hydrazido and iminoacyl groups to be eta2-bound to the metal with an PhN-NHPh distance of 1.47(2) angstrom and Bu(t)N-CMe distance of 1.26(2) angstrom.