An easy and direct synthetic route to phosphamido niobocenes through nucleophilic attack of phosphide niobocene complexes on acyl halides

Abstract

Abstract The synthesis of the new cationic functionalized phosphane niobocene complexes [Nb(η 5 -C 5 H 4 SiMe 3 ) 2 (P(CH 2 CO(C 6 H 5 ))Ph 2 )(L)]Cl, L CO ( 3 ) or CNXylyl ( 4 ), and new phosphamido-niobocene complexes [Nb(η 5 -C 5 H 4 SiMe 3 ) 2 (P{CO(C 6 H 5 )}Ph 2 )(L)]Cl, L CO ( 5 ), CNXylyl ( 6 ), [Nb(η 5 -C 5 H 4 SiMe 3 ) 2 (P(COCH(C 6 H 5 ) 2 )Ph 2 )(L)]Cl, L CO ( 7 ) or CNXylyl ( 8 ), has been achieved. The complexes were prepared by reaction of the Lewis base niobocene complexes [Nb(η 5 -C 5 H 4 SiMe 3 ) 2 (PPh 2 )(L)], L CO ( 1 ) or CNXylyl ( 2 ), with the appropriate RX (PhCOCH 2 Cl, chloroacetophenone) and RCOX (PhCOCl, benzoyl chloride, Ph 2 CHCOCl, diphenylacetyl chloride) reagents through the formation of new P–C bonds in the corresponding nucleophilic substitution reactions. These processes afforded new metallophosphanes in which one of the substituents on the phosphorus atom contains a ketonic moiety. The presence of the carbonyl group in the coordination sphere of phosphorus increases the coordination possibilities of the phosphane and enriches the applications of these complexes.