V R Srinivasan
Articles written in Proceedings – Section A
Volume 46 Issue 1 July 1957 pp 53-60
Groundnut shell hemicellulose A1 has been shown to contain residues of D-xylose and D-glucuronic acid. The methylated polysaccharide gave on hydrolysis 2, 3, 4-tri-O-methyl-D-xylose, 2, 3-di-methyl-D-xylose and 2-O-(2, 3, 4-tri-O-methyl-D-glucuronosyl)-3-O-methyl-D-xylose in the molar ratio of 1: 30: 1. A structure is proposed for the hemicellulose which has a straight chain of ca. 30, 1: 4-linked β-D-xylopyranose residues with D-glucuronic acid existing as a side chain through the C2 position of one of the xylose residues.
Volume 49 Issue 2 February 1959 pp 98-103
Groundnut shell hemicellulose B1 has been shown to contain D-xylose, L-arabinose and D-glucuronic acid. The methylated polysaccharide gave on hydrolysis 2, 3, 5-tri-O-methyl-D-arabofuranose, 2, 3, 4-tri-O-methyl-D-xylose, 2, 3-di-O-methyl-D-xylose, 3-O-methyl-D-xylose and 2, 3-di-Omethyl-D-glucuronic acid in the molar ratio of 1∶1∶22∶1∶1. A structure is proposed for the hemicellulose which has a straight chain of
Volume 50 Issue 3 September 1959 pp 213-218
The Raman spectra of pyridine N-oxide and its solutions in phenol, methanol and dioxan have been recorded. The band at 1254±10 cm.−1 has been assigned to the N-O stretching vibration. The variations in the double bond frequencies of pyridine ring, and in the frequency of N-O bond, owing to hydrogen bond formation, have been listed. On conversion of pyridine to pyridine N-oxide the various frequencies attributed to the different modes of vibrations in the pyridine ring get altered as a result of the considerable disturbance caused by the new bond.
Volume 55 Issue 4 April 1962 pp 221-226
The Raman spectra of 2-picoline N-oxide and 3-picoline N-oxide have been recorded. The Raman shift in the region of 1254 cm.−1 has been assigned to the N-O stretching vibration. The variations in the frequency of the N-O bond on admixture of these N-oxides with phenol have been studied and explained to be due to hydrogen bond formation of the type (N-O......H).
Volume 55 Issue 6 June 1962 pp 360-366
A convenient method for the preparation of 8-hydroxyquinoline N-oxide in fair yields has been reported. The presence of strong intramolecular association in 8-hydroxyquinoline N-oxide has been demonstrated. A preliminary appraisal of the utility of this compound as an analytical reagent has been carried out and it has been found that 8-hydroxyquinoline N-oxide is more selective in metal-complex formation than 8-hydroxyquinoline.