Dioxazaborenines

Article abstract of DOI:10.1002/ardp.19813140703

The reaction of 2-naphthol with hexamethylenetetramine in the presence of boric acid in 2-ethoxyethanol gives the dioxazaborenine 2, which can be hydrolozed to the phenolic Mannich base 1.An analogous derivative 4 is produced from 1 and dihydroxyphenylborane (3), while hydroxydiphenylborane (5) yields a labile boron chelate 7, which on heating undergoes amine elimination to yield 8 and the quinone methide 11.