Hydroxybenzophenones, molecular

Polyfunctional polycondensates were prepared from formaldehyde and a mixture of two different low molecular weight stabilizers, e.g. of 2-hydroxybenzophenone or its derivatives with various 4-alkylphenols [170], e.g. stabilizer 133 (a combination of LS and AO), of a phenol with benzoxazole [171] or 4-nonylphenol and... 

UV absorbers perform by absorbing UV light energy that they transform into molecular vibrations, rotations, and eventually heat. In the case of hydroxybenzophenones, this takes place by forming a tautomeric structure (123A) ... 

Chloro-2-hydroxybenzophenone added to a soln. of tryptophan in benzyldi-methylanilinium hydroxide, allowed to stand overnight over molecular sieve 3 A, filtered, excess benzyldimethylanilinium hydroxide removed in vacuo, and the residue refluxed 1 hr. in toluene product. Y 74%. - By this method, acid-sensitive amino acids can be converted into their benzyl esters. K. Williams and B. Halpern, Australian J. Chem. 28, 2065 (1975). 

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