摘要:
五卤化物NbX5(X = Cl,Br)与1,1-二烷氧基烷烃CHR'(OEt)2或1,3-二氧戊环的反应产生配位加合物NbX5 [kappa1-(OEt)CHR'(OEt)]( X = Cl,R'= H,2a; X = Br,R'= H,2b; X = Cl,R'= Me,2c; X = Br,R'= Me,2d)或NbCl5(kappa1-right角OCH2OCH2C直角H2)3。化合物2a-c和3在室温下稳定,而2d缓慢转化为烷氧化物NbBr4 [OCH(Me)OEt],4。当CH2(OMe)2,CHMe(OMe)2和具有MX5的CMe2(OMe)2(M = Nb,Ta; X = Cl,Br)。配合物MX5 [O(Me)(CH2X)],5和[MX3(OMe)2] 2,6由MX5 / CH2(OMe)2选择性形成(M = Nb,Ta; X = Cl,Br) ,而[NbX4(OMe)] 2(X