| Abstract |
The allenylidene complexes trans-[FeBr( C=C=CRR )(depe)(2)] [Y] (R = Me, R = Ph, 1; R R = Ph, 2; R = R = Et, 3; depe = Et2PCH2CH2PEt2; Y = BF4, BPh4) were obtained by reaction of trans-[FeBr2(depe)(2)] with the appropriate alkynol HC\&3bond; CCRR (OH), in MeOH and in the presence of Na[BF4] or Na[BPh4]. Deprotonation of 3 or nucleophilic gamma-addition to 2 led to the neutral enynyl and alkynyl complexes trans-[FeBr\-C\&3bond; CC(=CHMe)Et\-(depe)(2)] (4) and trans- [FeBr(-C\&3bond; CCPh2R )(depe)(2)] (R = CN (5a), MeO (5b)), respectively. Complex 2 (Y = BPh4) also leads to the cationic alkynyl compounds trans-[Fe(NCMe)\-C\&3bond; CCPh2(X)\(depe)(2)][BPh4] (X = NMe2 (6a), NHMe (6b)) and trans-[Fe(NCMe)\-C\&3bond; |
