Desirably, R4 is a carbon atom, so that the photoreactor composition has the following general formula: More desirably, R1, R2, and R3 are hydrogen, and R4 is a carbon atom, so that the photoreactor composition has the following general formula Even more desirably, the photoreactor of the present invention is 1-phenyl-4-hydroxy-4-methyl-1-penten-3-one having the following formula: A method of synt