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With potassium carbonate In methanol; water mixt. stirred at 25°C for 10 h; filtration; MeOH removed in vac.; soln. cooled; acidified (HCl); crystn.; filtration; washed (H2O); IR; NMR; mass spectra;
With triphenylphosphine In tetrahydrofuran; tetrachloromethane addn. of B-compound in THF to PPh3 in CCl4; warmed to 50°C for 20 h; ppt.; filtration; filtrate concd.; extn. (warm hexane); hexane removed; IR; NMR; mass spectra;