O-Hydroxyphenones

Figure 6. Arrhenius plot of the formation of o-hydroxyphenone groups as measured by absorbance changes at 335 nm. The transition temperatures of the polymer are also shown.

Regioselective reductions. The deoxygenation of o-hydroxyphenones can be accomplished. Thus, mixed carbonates of 4-acylresorcinols are converted into monoprotected alkylresorcinols. 

The metallic derivatives of the aromatic o-hydroxyalde-l .ydes and the o-hydroxyphenones fall into the group of... 

Another class of compounds is represented by benzotriazoles i.e. o-hydro-xyphenylbenzotriazoles, which have a photostabilisation mechanism similar to o-hydroxyphenones, by rapid tautomerization of the excited states. 

S-triazine, such hydroxyphenyl-s-tiiazines, act by a mechanism similar to o-hydroxyphenones with the following considerations ... 

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