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Krishnaswami Venkataraman

Krishnaswami Venkataraman, Indian organic chemist (Chennai  07 June 1901 – New Delhi 12 May 1981)



Authored 271 papers


Authored a classical treatise on chemistry of dyes and dye intermediates named The Chemistry of Synthetic Dyes in five volumes (1-2 in 1952 and 3-5 in 1971-8) translated into 14 foreign languages 


Discovered Baker-Venkataraman transformation or rearrangement

A synthesis of flavones at room temperature. Curr. Sci. (1933)


Isolated flavonoids from plant sources and elucidated their structures


Demonstrated the presence of nitrogen in some lac pigments


Isolated and characterized a number of natural pigments belonging to anthraquinonoid group (e.g. laccaic acids A and B)


Isolated artocarpanone from Artocarpus heterophyllus


Developed methods for selective demethylation of methoxy flavonoids under mild Lewis acid conditions, for introduction of hydroxyl groups in oxygen heterocycles involving nitration or azocoupling, replacement of nuclear OH by through tosylation followed by Raney nickel hydrogenolysis and many more such procedures


Developed several new synthetic procedures, chromatographic separation techniques and simple and practical methods for the characterization and estimation of dyes


Developed a method for the facile hydrolysis of the anilides of o-hydroxy carboxylic acids  

 

Demonstrated the deshielding effect of azogroup of azodyes in their nuclear magnetic resonance spectra


Developed new textile auxiliary agents for industrial use


Developed column chromatographic technique under hot conditions (100-150° C) for study of dyes


Developed some simple methods for the analysis and estimation of dyes and related compounds (e.g. introduced Congo Rubine Number to determine the protective colloidal action of surface active compounds and discovered that naphthols could be estimated by precipitating them by acidifying their alkaline solution in water or aqueous alcohol and weighing their precipitate)



LINKS 

http://www.ncl-india.org/aboutncl/Dec2004p45-51.pdf