Abstract
48 varieties of 2-acyl(or aroyl)-5, 6, 7, 8-tetrahydro-1(or 3)-naphthol, aryl 1-(or 3-)hydroxy-5, 6, 7, 8-tetrahydro-2-naphthoate and 1-(or 3-)methoxy-2-aroyl-5, 6, 7, 8-tetrahydronaphthalen were synthesized. They provided two absorption maxima in the U V region. Except two cases, the maxima of 1-hydroxy-2-carbonyl compounds in shorter wave length region shifted 3-9mμ to longer wave length region from that of 3-hydroxy-2-carbonyl compounds. The absorption maxima of the former in longer wave length region shifted 4-9mμ to shorter wave length region from that of the latter.The shift in the shorter wave length region is explained by the stronger intermolecular chelate formation of 1-hydroxy-2-carbonyl compounds and the shift in the longer wave length region is supposed to be easier formation of para-quinoid form of 3-hydroxy-2-carbonyl compounds.Though 1-hydroxyketone compounds are very stable against sun light, o-hydroxy-carboxylic acid esters are generally unstable and o-methoxy ketones are also unstable.
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