boron trichloride T=120°C;

boric acid unter Abdestillieren des entstandenen Wassers und nicht umgesetzten Alkohols;

in benzene exclusion of moisture; a mixt. of B2O3 and HOCH2C(CH3)CH2 in dry benzene was refluxed with fractional sepn. of the formed H2O;; removal of solvent under reduced pressure; distn. (vac.); elem. anal.;;

in benzene byproducts: ethanol; exclusion of moisture; a mixt. of metal alkoxide and methallyl alcohol in dry benzene was refluxed with fractional sepn. of alcohol/benzene azeotrope;; removal of solvent under reduced pressure; distn. (vac.); elem. anal.;;

in neat (no solvent) exclusion of moisture; disproportionation by heating of alkenoxy boroxine to 100-135°C/1.0 mmHg (a much higher temp. then b.p. of corresponding orthoborate);