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Reduction of aromatic compounds(Birch reduction)

The reduction of aromatic compounds to 1.4-cyclohexadiene compounds in   presence of alkali metal liquid ammonia and an alcohol is called Birch reduction. A variety of aromatic compounds containing electron donating or electron withdrawing groups could be readily converted to the corresponding 1,4 cyclohexadiene derivatives. The regioselectivity towards the products in Birch reduction of substituted  aromatic compound depends on the nature of the substituent. For example, the  electron donating substituent such as alkyl or alkoxy group remains on the  unreduced carbon where as the electron withdrawing groups such as carboxylic  acid or primary amide remains on reduced carbon almost exclusively. The aldehydes and esters groups are in the electron donation side because  these are reduced to the corresponding alcohols in Birch condition before the  reduction of aromatic ring . The addition of one or two equivalent of  water or t-BuOH to the NH, before the addition of

reason behind yellow stain caused by nitric acid in our hands

nitric acid reacts with our hands, which contain proteins of aromatic amino acids.it forms the yellow stains in our hand , because of nitration takes place in the aromatic amino acid rings to form the yellow color  nitrated amino acid. this reaction is carried by xanthoproteic test.