18475-02-0Relevant academic research and scientific papers
1,2-Halosilane vs. 1,2-alkylborane elimination from (boryl)(silyl) complexes of iron: Switching between borylenes and silylenes just by changing the alkyl group
Braunschweig, Holger,Dewhurst, Rian D.,Radacki, Krzysztof,Wennemann, Benedikt,Ye, Qing
, p. 15465 - 15468 (2015)
Reaction of different combinations of aryl(dihalo)boranes and trialkylsilyl iron metallates, a route previously used to prepare a terminal iron arylborylene complex, is found to lead to three distinct new reaction outcomes, including unselective decomposition, an inert iron(ii) (boryl)(silyl) complex, and a dinuclear bis(μ-silylene) complex. The latter result is to our knowledge the first example of a 1,2-alkylborane elimination, in contrast to the facile and ubiquitous 1,1-alkylborane elimination observed from (alkyl)(boryl) transition metal complexes, and is also a novel route to bridging silylene complexes.
Preparation and characterization by 31P-NMR spectroscopy of mixed disubstituted complexes
Bellachioma, Gianfranco,Cardaci, Giuseppe,Macchioni, Alceo,Reichenbach, Gustavo
, p. 367 - 376 (2007/10/02)
The disubstituted complexes , where L and L' are different phosphine ligands have been prepared by reaction of the hydrosilyl derivatives with L'.Good results were obtained for L = PMe3 and L' = PPh3, P(OPh)3, P(OEt)3 or P(O-i-Pr)3 but with L' = PMe2Ph, PMePh2, PEt3, a mixture of homo and mixed disubstituted derivatives were obtained.The results can be interpreted in terms of exchange of the L ligand in 3 with L'.The variations in the 31P NMR chemical shifts and 2JPP coupling constants are discussed in the light of the properties of the ligands, and good correlations are revealed with the cone angle and the pKa, respectively.
