Radical Processes in Lipids. Selectivity of Hydrogen Abstraction From Lipids by Benzophenone Triplet

Laser photolysis techniques have been used to measure the reactivity of benzophenone triplet (3BZP) toward various fatty acids and two glycerides in benzene solution. Eight compounds varying both in number and in the configuration of olefinic bonds have been examined. It has been found that the rate constant for hydrogen abstraction from these compounds by 3BZP may be related to the number of secondary, allylic and doubly allylic hydrogens in each molecule by the equation: kH = [0.023[H sec] + 0.112[H allylic] + 1.78[H doubly allylic]] x 10(7) M-1s-1