= NPh, R = R′ = Me; 5c, Z = NPh, R = Me, R′ = Et; 5d, Z = NPh, R = Me, R′ = H; 6a, Z = O, R = Me, R′ = Ph; 6b, Z = O, R = Et, R′ = Ph) respectively. The molecular structure of 6a was determined by single-crystal diffractometry. It shows a typical bent-metallocene geometry around the niobium atom with the η2(C,O) ketene and methyl groups arrayed in the plane between the two cyclopentadienyl rings. Finally
[
铌(η 5 -C 5 H ^ 4森达3)2 Cl(上η 2 - (C,Z)ZCCRPh)](1A,Z = NPH,R = Ph值;图1b,Z = NPH,R =甲基; 1C,Z = NPh,R = Et; 1d,Z = NPh,R = H; 2,Z = O,R = Ph)与Li(BEt 3 H)和格氏(RMgl)或二烷基
镁(R 2 Mg )试剂,得到氢化niobocene配合物[
铌(η 5 -C 5 H ^ 4森达3)2(η 2-(C,Z)ZCCRPh)](3a,Z = NPh,R = Ph; 3b,Z = NPh,R = Me; 3c,Z = NPh,R = Et; 3d,Z = NPh,R = H ; 4,Z = O,R =苯基)和烷基niobocene配合物[
铌(η 5 -C 5 H ^ 4森达3)2 R(η 2 - (C,Z)ZCCR'Ph)](5a中,Z = NPh,R =