Sazonova, V. A. published the artcileReaction of tetraphenylborocopper with oxo compounds, SDS of cas: 971-66-4, the publication is Zhurnal Obshchei Khimii (1956), 3440-5, database is CAplus.
cf. C.A. 50, 1644d. To 2.25 g. Et benzalacetoacetate in MePh was added at 80° 5 g. pyridine salt of PH4BCu (I); after filtration, treatment with 10% AcOH, then 10% NaOH and H2O, there was formed on evaporation 70% Et α-benzhydrylacetoacetate, m. 83-4°, also formed under N in 70% yield. The precipitate formed in the reaction was 96% Cu. Similarly benzalacetylacetone gave 61% α-benzhydryl-α-acetylacetone, m. 115.5°, Et benzalbenzoylacetate gave 98% Et benzhydrylbenzoylacetate, m. 135°, Et α-ethylideneacetoacetate gave over 100% Et α-phenethylacetoacetate, b4.5 125.5-6°, nD20 1.4990; benzalacetophenone gave 29% β,β-diphenylpropiophenone, m. 96-6.5°, and dibenzalacetone and I heated to 160° gave 42% α-benzhydryl-α-benzalacetone, m. 136-6.5°. To 1.14 g. BzH in MePh was added at 80° 5 g. I yielding 0.71 g. Ph2; a similar failure to add was noted for Ph2CO and dibenzoylethylene. Addition of 7.5 g. I at 75° under N in CCl4 gave a brown precipitate containing Ph3B pyridine salt and Cu salts; evaporation of the filtrate and heating with H2O 2 hrs. with Ca(OH)2 and powd. Fe gave BzOH. The brown precipitate extracted with Me2CO gave on extraction with Me2CO and treatment of the insoluble part with aqueous KI, a precipitate of CuI and iodine; the filtrate gave triphenylboron pyridine salt, m. 212-18° (decomposition).
Zhurnal Obshchei Khimii 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, SDS of cas: 971-66-4.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem