Oct., 1936 CONDENSATION OF %~JTANoNIT WITH ALDEHYDRS OF THE TYPE RR'CHCHO 1871 ... Diphenylsulfone exists in two reciprocally convertible allotropic forms, one melting at 12S0, and the other at 124'. The conditions are explained under which one form can be changed into the other, the transition temperature being about '74.8'. Some of the confusion in the literature 011 this subject is thus explained. NEW YORK, N. Y. RECEIVED JULY 17, 1936
