Bohme, Horst published the artcileAddition compounds of triphenylboron and thioethers or tertiary amines, Product Details of C23H20BN, the publication is Zeitschrift fuer Anorganische und Allgemeine Chemie (1957), 160-3, database is CAplus.
cf. C.A. 51, 13739e. NaBPh4 in MeOH with Me2SBr2 at 5-10° precipitated Me2SBPh3 (I), m. 180°; with (iso-Pr)2S and Br at 0° (iso-Pr)2SBPh3, m. 165° (decomposition); with tetrahydrothiophene dibromide at -5-0° unstable (C4H8S)2BPh3, m. 132-3°; and with PhCH2SBr2 at -70° in a closed system, PhCH2SBPh3, decomposed at room temperature With pyridine dibromide at 0° and with Et3NBr2, the products were colorless C5H5NBPh3, m. 214° (decomposition), and Et3NBPh3, m. 177-8°, resp. Ph2SBPh3 could not be prepared in this way, nor could the thioether addition compounds be prepared by direct combination. I was insoluble in H2O and most organic solvents and was not attacked in the cold by dilute acids or alkalies.
Zeitschrift fuer Anorganische und Allgemeine Chemie published new progress about 971-66-4. 971-66-4 belongs to pyridine-derivatives, auxiliary class Pyridine,Benzene, name is Triphenyl(pyridin-1-ium-1-yl)borate, and the molecular formula is C23H20BN, Product Details of C23H20BN.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem