THE REACTIVITY OF CITRONELLOL and α‐THUJENE WITH SINGLET OXYGEN. RATE CONSTANTS OF CHEMICAL REACTION and PHYSICAL QUENCHING*

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Abstract
The quantum yields of Rose Bengal sensitized photooxidation of citronellol and α‐thujene have been determined as a function of added acceptor and compared with those of furfuryl alcohol as a standard. The results permitted the calculation of the corresponding rate constants of chemical reaction(kT)and physical quenching (Kq) of singlet oxygen. The sum(kT+ kq)has been verified independently by a Stern‐Volmer analysis of the singlet oxygen luminescence quenching. α‐Thujene reacts faster with singlet oxygen than citronellol, physical quenching being negligible in both cases.