Characterization of the triplet state of aromatic esters. Electron spin resonance spectrum of the triplet state of substituted methyl benzoates

Effects of ring substituents on the type II photoreactions of phenyl ketones. How interactions between nearby excited triplets affect chemical reactivity

“…Even though D for the , * triplet of benzophenone43 has an absolute value very similar to the E* values of these substituted valerophenones, all phenyl alkyl ketones with lowest , * triplets display considerably larger values of D (0.24-0.44 cm-1).44 Our D* value for valerophenone itself in ethanol agrees closely with both the D and D* values (E is quite small) recently reported for benzonitrile440 and methyl benzoate 45. (Both the cyano and the carboxy groups closely mimic the acyl group in their effects on , * Substituent Effects on Triplets of…”

Misleading sigmas and neglected geometries: the effects of methyl substitution on rates of triplet state hydrogen abstraction by the benzoyl group

“…!-methoxybenzonitrile each has a lower triplet energy tlan its para-isomer, whereas E-chloroand E-cyanobenzonitrile each has a lower triplet energy than its meta-isomer. Arnold has obtained similar results for substituted benzoate esters (24).…”

Tandem energy transfer–electron transfer in the photosensitized alkylation of α,β-unsaturated ketones

“…9 In turn, electron transfer from the stannane to the esters is thermoneutral, ⌬G set (2x→TMPM 3* ) = 0 kcal mol…”