B.Venkateswara Rao

An efficient synthesis process access to disubstituted pyrazoles have been demonstrated from 2-propyn-1-alcohols using an effective catalyst Polymer bound pTSA. This conversion proceeds via an acid catalyzed propargylation of N,N-diprotected hydrazines followed by base-mediated cyclization to furnish 3,5-Disubstituted-1H-pyrazoles in optimum yields.

Solvent extraction of iron (III) from hydrochloric, sulphuric, nitric and perchloric acid solutions with Tri-n-butylamine (TBuA) in benzene has been studied. The extractions are nearly quantitative from all the acid solutions. The optimum conditions for extraction were established from the study of the effect of several variables like concentration of amine, metal ion, acidity, foreign ions etc. Attempts are also made to strip iron from the organic phase with 1.0M H2SO4. The extracted species are identified.  The method has been applied for the determination of iron in tap water as well as ferrochrome slag.