Synthesis, structures, and electrochemistry of group 6 aminocarbenes with a P-chelating 1'-(Diphenylphosphino)ferrocenyl substituent

Abstract

Ferrocene amides Ph2PfcC(O)NR2 (1; fc=ferrocene-1,1'-diyl, NR2=NEtz (a), morpholin-4-yl(b) react with [Cr(CO)5]2- in the presence of Me3SiCl to give easily separable mixtures of the respective P-chelated carbene [Cr(CO)4(Ph2PfcC(NR2)-k2C1,P)] (2) and a phospinecomplex, [Cr(CO)5(1-kP)] (3). A similar reaction between 1a and [W( is more cpmlex, affording a mixture of the nonchelated carbene [Cr(CO)4{Ph2PfcC(NEt)2-kC1}]. (5), trimetallic carbene [(μ-1kC1, 2kP-Ph2PfcC(NEt2)) {W(CO)5}2].

Keywords

• synthesis
• electrochemistry
• P-chelating
• Fischer carbene complexes
• asymmetric allylic alkylation
• metal carbyne complexes
• X-ray crystal-structure
• 1'-(diphenylphosphino)ferrocenecarboxylic acid
• (aminocarbene)chromium(0) complexes
• carbonyl-complexes