Cobalt, nickel, copper, and oxidovanadium(2+) could be incorporated into nonpolar tetraphenyl porphyrin by using feed materials as metal sulfate, nitrate, and chloride salts and reaction in high-temperature water (423 to 673 K). Yields of metalloporphyrins increased to 94% at 673 K, which indicates that the dissolution of porphyrin and reaction of the metal salts are enhanced in high-temperature water.