Patent ID: 6545175
Filing Date: 2003-04-08
Classification: C07C

Abstract:
A composition comprising:a compound having the formula (III): â€ƒwherein; n is 0 or 1; P4 through R12 are independently selected from hydrogen, C1 to C10 alkyl, C6 to C10 aryl, C1 to C10 alkoxy, C1 to C10 aryloxy, and C1 to C10 aralkyl; R2 is hydrogen, C1 to C10 alkyl, C6 to C10 aryl, or C1 to C10 aralkyl; R1 and R3 are C1 to C10 alkyl, C6 to C10 aryl, or C1 to C10 aralkyl; provided that R1&boxH;R3; and one or more compounds analogous to formula III, provided that the concentration of the compound of formula III is more than twice the concentration of the analogous compounds; where analogous compounds are defined as compounds having the same structure as formula III except that R1 is not the same as R3.