1-N, 1-N,-PHENYLBIS 5-METHYL-4-PYRAZOLIN-3-ONES

摘要

1388986 1-N,1-NSP1/SP-phenylbis-(5-methyl-4- pyrazolin-3-ones) MONTECATINI EDISON SpA 26 Sept 1973 [26 Sept 1972] 45122/73 Heading C2C The invention comprises compounds of formula: in which the pyrazolone ring ASP1/SP is in the meta or para position with respect to the pyrazolone ring A. They may be prepared by reacting an excess of the diacetyl dimer in the aldolic form with the phenyldiamine tetrazonium salt housing HSO 4 SP(-)/SP as an anion, at a temperature of from 30‹ to 50‹ C.