824426-56-4Relevant academic research and scientific papers
Reactivity of the bis(pentafluorophenyl)boranes CIB(C6F 5)2 and [HB(C6F5)2] n towards late transition metal reagents
Al-Fawaz, Amal,Aldridge, Simon,Coombs, Deborah L.,Dickinson, Anthony A.,Willock, David J.,Ooi, Li-Ling,Light, Mark E.,Coles, Simon J.,Hursthouse, Michael B.
, p. 4030 - 4037 (2007/10/03)
The reactivities of the highly electrophilic boranes ClB(C 6F5)2 (1) and [HB(C6F 5)2]n. (2) towards a range of organometallic reagents featuring metals from Groups 7-10 have been investigated. Salt elimination chemistry is observed between 1 and the nucleophilic anions [(η5-C5R5)Fe(CO)2]- (R = H or Me) and [Mn(CO)5]-, leading to the generation of the novel boryl complexes (η5-C5R5)Fe(CO) 2B(C6F5)2 [R = H (3) or Me (4)] and (OC)5MnB(C6F5)2 (5). Such systems are designed to probe the extent to which the strongly σ-donor boryl ligand can also act as a π-acceptor, a variety of spectroscopic, structural and computational probes imply that even with such strongly electron withdrawing boryl substituents, the π component of the metal-boron linkage is a relatively minor one. Similar reactivity is observed towards the hydridomanganese anion [η5-C5H4Me)Mn(CO) 2H]-, generating a thermally labile product identified spectroscopically as (η5-C5H4Me)Mn(CO) 2(H)B(C6F5)2 (6). Boranes 1 and 2 display different patterns of reactivity towards low-valent platinum and rhodium complexes than those demonstrated previously for less electrophilic reagents. Thus, reaction of 1 with (Ph3)2Pt(H2C=CH 2) ultimately generates EtB(C6F5)2 (10) as the major boron-containing product, together with cis-(Ph 3P)2PtCl2 and trans-(Ph3P) 2Pt(C6F5)Cl (9). The cationic platinum hydride [(Ph3P)3PtH]+ is identified as an intermediate in the reaction pathway. Reaction of 2 with [(Ph3P) 2Rh(μ-Cl)]2, in toluene on the other hand, appears to proceed via ligand abstraction with both Ph3P·HB(C 6F5)2 (11) and the arene rhodium(I) cation [(Ph3P)2Rh(η-C6H5Me)] + (14) ultimately being formed.
