A convenient synthesis has been achieved of 11 substituted phthalazines starting from the condensation of 2-( p-toluoyl)benzoic acid with hydrazine and some of its simple congeners, H 2 NNHR. Four of the phthalazines showed activity as inhibitors of the corrosion of steel immersed in 5 M HCl solutions.
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Hemdan et al. (2014) studied this question.
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