Patent ID: 7423160

Claim:
A method of making a metal complex, comprising: (a) providing a 1-monoacyldipyrromethane; and then (b) combining said 1-monoacyldipyrromethane with a compound of the formula R 1 R 2 MX, wherein: M is boron, 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; and X is an anion leaving group; to produce a metal complex of the formula DMR 1 R 2 , wherein DH is said 1-monoacyldipyrromethane.