Abstract
The substituted monomeric phosphanylboranes Ph2P-BH2 center dot NMe3 (1) and tBuHP-BH2 center dot NMe3 (2) have been used for the synthesis of cationic chain compounds built up by R2P-BH2 units. With a simple synthesis route, the highly stable cations [Me3N center dot H2B-PR1R2-BH2 center dot NMe3](+) (1a, 2a) and [Me3N center dot H2B-PR1R2-BH2-PR1R2 center dot BH2 center dot NMe3]+(1b, 2b) (R 1 ...
Abstract
The substituted monomeric phosphanylboranes Ph2P-BH2 center dot NMe3 (1) and tBuHP-BH2 center dot NMe3 (2) have been used for the synthesis of cationic chain compounds built up by R2P-BH2 units. With a simple synthesis route, the highly stable cations [Me3N center dot H2B-PR1R2-BH2 center dot NMe3](+) (1a, 2a) and [Me3N center dot H2B-PR1R2-BH2-PR1R2 center dot BH2 center dot NMe3]+(1b, 2b) (R 1 = R-2= Ph; R-1= H, R-2= tBu) are obtained as iodide (I-) salts. The reaction of H2As-BH2 center dot NMe3 (3) with IBH2 center dot SMe2 leads to [Me3N center dot H2B-AsH2-BH2-AsH2-BH2 center dot NMe3][ I] (3a), the longest so far known arsanylborane chain. Compound 3a reacts with acetonitrile through a formal hydroarsination reaction to form [cyclo-{As(BH2 center dot NMe3)(CMe= NH)(2)(BH2)}][I] (4). The reported synthetic strategy has proved to be a powerful tool for the formation of small, cationic oligomeric units. All products were comprehensively characterized by X-ray structure analysis, NMR, IR spectroscopy, and mass spectrometry in cooperation with DFT calculations.
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