Borane-dihydrogen complex

G. N. Patwari, T. Ebata, and N. Mikami, Evidence of dihydrogen bond in gas phase phenol-borane-dimethylamine complex, J. Chem. Phys. 113, 9885-9888 (2000). 

Hundreds of dihydrogen complexes have been isolated and thoroughly studied to date, and many borane, silane, germane, and related (T-complexes have also been synthesized and structurally characterized. An... 

In contrast with the CH4 molecule, the NC-H + bonds in borane amine (CH3)3NBH3 are slightly polarized. Even such slight polarization is sufficient for the formation of the dimer (CH3)3NBH3- (CH3)3NBH3, which can be formulated as a dihydrogen-bonded complex. Here, two bifurcated CH H-B... 

A simple example of this reaction is provided by the addition of H-Bcat to the zero oxidation state complex, Os(CO)2(PPh3)3, to form (l)4 (see Scheme 1). (1) has mutually trans phosphine ligands and is coordinatively saturated. In contrast, H-Bcat addition to RuHCl(CO)(PPh3)3, which presumably reacts via the five-coordinate hydride, RuHCl(CO)(PPh3)2, and is accompanied by dihydrogen loss, yields the coordinatively unsaturated Beat complex, Ru(Bcat)Cl(CO)(PPh3>2 (2).5 A variety of related boranes react in the same manner and an example is provided by compound (3). To access the... 

Scheme 8 Displacement of two dihydrogen ligands by the borane H2BMes to form K complex 31. ...

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