Summary Condensation of biacetyl with phenol or with o-cresol resulted in the formation of a diphenolic ketone, 2, 2-bis-(p-hydroxyphenyl)-3-butanone or 2, 2-bis-(P-hydroxy-m-tolyl)-3- butanone, respectively. Condensation of biacetyl with m-or p cre 01 took a different course, yielding 2, 3, 6, 6'-tetramethyl-or 2, 3, 5, 5'-tetramethylcoumarano-3', 2',-2, 3-coumarane, respectively. These coumarano-coumaranes were synthesized by a different route, ...
