Via miscellaneous approaches

Triphenylbismuthine is oxidized by A-bromosuccinimide, lead tetraacetate or benzoyl nitrate to give triphenylbismuth bromo(succinimide), diacetate and 

A solution of triphenylbismuthine (22 g) in dry carbon tetrachloride (50 ml) was cooled to - 15°C and treated with a similarly cooled solution of henzoyl nitrate prepared in situ from benzoyl chloride (37 g) and silver nitrate (50 g). The mixture was well shaken, left to stand for 16 h and filtered. The residue was extracted with chloroform repeatedly and the combined filtrate and extracts were diluted with light petroleum to precipitate the dinitrate as a solid (27.5 g). This, on further extraction with cold ether, left insoluble triphenylbismuth dinitrate (12.5 g) [24JCS( 125)854], 

Deprotection of tris(methoxymethoxyphenyl)bismuth dichlorides affords the corresponding tris(hydroxyphenyl)bismuth dichlorides, the para-isomer of which is acetylated by acetic anhydride/pyridine at the hydroxyl group to yield tris(4-acetoxyphenyl)bismuth dichloride [98JCS(P1)2511]. 

Triphenylbismuth difluoride has been synthesized by thermal decomposition of a cationic triphenylbismuth(V) complex [Ph3Bi(OAsPh3)2][Bp4]2 in dichloromethane [731C944]. Tetraphenylbismuth tribromide is transformed thermally to triphenylbismuth dibromide [52LA(578)136], while tetraphenylbismuth triphenylsiloxide is readily cleaved by HCl to give triphenylbismuth dichloride [75DOK(225)581]. 

Triphenylbismuth dinitrate (10 g) was dissolved in fuming nitric acid at 0°C, and the resulting mixture was allowed to stand at 0°C for 12 h. The reaction mixture was poured into ice water (500 ml) and the deposit was filtered oif, dried and recrystallized from ethyl acetate to give the dinitrate as a pale yellow solid, which exploded on heating at about 147°C [26JA507]. 

---