Patent ID: 7317108

Claim:
A method of making a 1,9-diacyldipyrromethane metal complex, comprising: providing a 1-monoacyldipyrromethane-boron complex, then acylating said 1-monoacyldipyrromethane in said complex at the 9 position to produce said 1,9-diacyldipyrromethane metal complex; wherein said 1-monoacyldipyrromethane-boron complex is a compound of the formula DMR 1 R 2 , wherein: D is a 1-monoacyldipyrromethane, M is boron, and R 1 and R 2 are each independently selected from the group consisting of alkyl, alkenyl, alkynyl, and aryl, each of which can be unsubstituted or substituted one or more times with a substituent selected from the group consisting of alkyl, alkenyl, alkynyl, aryl, alkoxy, alkylcarbonyl, alkylcarbonyloxy, alkylsulfinyl, alkylsulfonyl, alkylthio, halo, cyano, nitro, sulfo, oxo, formyl, azido, and carbamoyl.