Patent ID: 6552209
Filing Date: 2003-04-22
Classification: C07F

Abstract:
In a process for producing a metal imino/amino complex of the formula and selected from the group consisting of R1N&boxH;M(NR2R3)3 and (R1N&boxH;)2Mâ€²(NR2R3)2 where M and Mâ€² are pentavalent or hexavalent metals respectively; R1 is C1-8 alkyl, silylalkyl, cycloalkyl, aryl, alkyl substituted aryl, or NR4R5 wherein R4 and R5 are independently alkyl, cycloalkenyl or R4 and R5 groups are joined in a cyclic form; and, R2 and R3 are individually selected from C1-8 alkyl, silylalkyl, cycloalkyl, aryl, alkyl substituted aryl or R2 and R3 groups are joined in a cyclic form, the improvement which comprises:(a) forming an intermediate complex selected from the group consisting of R1N&boxH;MX3(DL)2 or ((R1N)2Mâ€²X2(DL))2 by reacting a reaction mixture consisting essentially of a metal halide of the formula and selected from the group consisting of MX5 or Mâ€²X6 with an amine consisting essentially of a primary amine of the formula H2NR1 in the presence of a donating ligand, DL, where M is a pentavalent metal and Mâ€² is a hexavalent metal respectively, X is a halide which is selected from the group consisting of fluoride, chloride, bromide and iodide; and R1 is as defined and then, (b) reacting the intermediate complex selected from the group consisting of R1N&boxH;MX3(DL)2 and ((R1N)2Mâ€²X2(DL))2 with a lithium amide of the formula LiNR2R3 where R2 and R3 are individually selected from the group consisting C1-8 alkyl, silylalkyl, cycloalkyl, aryl, alkyl substituted aryl or R2 and R3 groups are joined in a cyclic form thereby producing said metal imino/amino complex of the formula selected from the group consisting of R1N&boxH;M(NR2R3)3 and (R1N&boxH;)2Mâ€²(NR2R3)2.