Aromatic esters methyl salicylate

Aromatic Esters Ethyl benzoate Benzyl benzoate Methyl salicylate... 

Essential oils are obtained from fruits and dowers (61,62). Volatile esters of short- and medium-chain carboxylic acids or aromatic carboxylic acids with short- and medium-chain alcohols are primary constituents of essential oils, eg, ethyl acetate in wines, brandy, and in fruits such as pineapple benzyl acetate in jasmine and gardenia methyl salicylate in oils of wintergreen and sweet birch. Most of these naturally occurring esters in essential oils have pleasant odors, and either they or their synthetic counterparts are used in the confectionery, beverage, perfume, cosmetic, and soap industries (see Oils,... 

Aromatic esters are hydrogenated without solvent or in alcohol. Ethyl benzoate (eq. 11.49),11 ethyl phenyl acetate,183 methyl salicylate (eq. 11,50),86a and diethyl phthalate (eq. 11.51)183 were hydrogenated almost quantitatively to the corresponding cyclohexane derivatives over Ni-kieselguhr at 150-200°C. The hydrogenation of the ethyl... 

Methyl salicylate is derived from oil of wintergreen—Gaultheria procumbens (Ericaceae). It is an aromatic ester derived from salicylic acid and methanol, though it can now be produced synthetically. Methyl salicylate is mainly used in topical applications and liniments as a counter-irritant and antirheumatic. Internal administration is not recommended since it is quite toxic in large doses. 

The reduction of salicylic acid to salicylaldehyde is believed to have been practiced commercially in India and the USSR [27]. Two-phase systems may also be used so that the aldehyde is rapidly removed from aqueous solution by extraction into an organic phase [28-30]. It was shown that correct choice of buffer and a two-phase system allows reductions of aromatic acids to aldehydes in acceptable yield (>50%) in addition, the likelihood of such success is greater with the lower pKa value of the acid and lower E1/2 value for reduction of the corresponding methyl ester [30]. 

Both aliphatic and aromatic isocyanates can be blocked by a variety of blocking agents. These include alcohols, phenols, oximes, lactams, j8-dicarbonyl compounds, bisulfite addition compounds, hydroxylamines and esters of p-hydroxybenzoic acid and salicylic acid. Perhaps the most widely used blocking agents at present are phenol, branched alcohols, 2-butanone oxime (methyl ethyl ketoxime) and 8-caprolactam. The use of blocked isocyanates in PU coatings has been comprehensively reviewed. ... 

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