Diorganylbismuth compounds with Bi-O bonds

An alternative approach to 1-aryl-3,3-bis(trifluoromethyl)-37/-2,l-benzoxabismole derivatives involves the reaction between the bismuthate complexes 10 with water or Mel. By this method, compounds 5 [95HAC293], 6 [92TL6653], 11 [95JA3922], and 12-14 are prepared [92TL6653, 95HAC293]. Transformations of this type of compound are described in detail in Section 4.2.1. 

240 nm [95ZN(B)735]. Mass spectra of these three p,-oxo compounds exhibit characteristic peaks due to M , R3Bi20, R2Bi20 and RBi20 ions. 

216°C for 4 h under vacuum (10 -10 mmHg), gaseous SO2 is evolved to produce triphenylbismuthine in good yield [71JOM(26)C10]. 

Disproportionation of the sulfonates yields triarylbismuthine and arylbismuth disulfonate. Several diarylbismuth triflate-HMPA complexes are prepared by the action of trimethylsilyl triflate and methanol on triarylbismuthines in the presence of HMPA [960M1951]. These complexes are stable colorless crystals or oils, readily soluble in CH2CI2, CHCI3, benzene, THF and methanol without decomposition. The HMPA ligand is effective in protecting the triflates from hydrolysis by atmospheric moisture without HMPA, these triflates become less stable in open air. H- 

Thermal decomposition of 2-(isopropoxycarbonyl)ethyltriphenylbis-muthonium trifluoromethanesulfonate leads to the formation of diphenylbis-muth trifluoromethanesulfonate in 16-84% yield [95JCS(P1)2543]. Recently, a preparation of diphenylbismuth trifluoromethanesulfonate has reported, however, there is only limited information on its properties [99TL285]. 

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