Preparation of acetylide and propadienylidene complexes of iron(II)
摘要:
Depending on the nature of the phosphine ligands, the reaction of phosphite-containing FeCl2 solutions with propargylic alcohols HC=CCRR'(OH) affords propadienylidene [Fe(=C=C=CPh2){P(OEt)(3)}(5)](BPh4)(2) and [FeCl(=C=C=CPh2){PPh(OEt)(2)}(4)]BPh4 complexes and acetylide [Fe{C=CCRR'(OH)} {P(OEt)(3)}(5)]BPh4 derivatives (R=R'=Ph; R=Me, R'=Ph). In contrast, the reaction of phosphite-containing FeCl2 Solutions with terminal alkynes RC=CH affords mononuclear [Fe(C=CPh){P(PEt)(3)}(5)]BPh4 and binuclear [{Fe[P(OEt)(3)](5)}(2)(mu-1,4-C=CC6H4C=C)](BPh4)(2) acetylide derivatives. All the new complexes were characterised by IR and H-1, P-31 and C-13 NMR data, and a geometry in solution was also established, (C) 2002 Elsevier Science Ltd. All rights reserved.