Abstract
Using boron trifluoride as a reference acceptor molecule, the methyl derivatives of oxygen, sulphur and selenium have an order of electron-pair donor power: O > S > Se. With both borine and trimethylborine, however, the order of co-ordination is S > Se, O. Moreover, the adducts (CH 3) 2S·BH 3 and (CH 3) 2Se·BH 3 are more stable than their boron trifluoride analogues. The weakness of boron trifluoride as an acid was further demonstrated by its quantitative displacement by diborane from the complex (CH 3) 3P·BF 3. In Group V b the order of co-ordination of methyl derivatives towards BH 3 is apparently P > N > As > Sb, compared with the order N > P > As > Sb shown by all other Group-III b acceptor molecules so far investigated. Possible explanations for these observations are discussed.
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