Patent ID: 6278025
Filing Date: 2001-08-21
Classification: C07C,C07D

Abstract:
A process for the preparation of substituted dibenzoylmethane compounds of the formula I, ##STR16##where the substituents R.sup.1 and R.sup.2 are defined as follows:R.sup.1 is 1,1-dimethylethyl;R.sup.2 is methoxy, which comprisesa.sub.1) condensing benzaldehydes of the formula II with acetophenones of the formula III to give the chalcones of the formula IV, in which the exocyclic double bond is in the E- or Z-configuration or a mixture thereof, and the substituents R.sup.1 and R.sup.2 are as defined above, ##STR17##a.sub.2) condensing benzaldehydes of the formula V with acetophenones of the formula VI to give the chalcones of the formula VII, in which the exocyclic double bond is in the E- or Z-configuration or a mixture thereof, and the substituents R.sup.1 and R.sup.2 are as defined above, and ##STR18##b) converting the chalcones of the formulae IV or VII into the dibenzoylmethane compounds of the formula I.