Articles written in Proceedings – Section A
Volume 8 Issue 3 September 1938 pp 145-159
Volume 8 Issue 4 October 1938 pp 187-193
Volume 9 Issue 1 January 1939 pp 72-77
The essential oil of
The oil has the characteristic odour of the leaves together with a strong note of cloves and is strongly phenolic in nature.
The oil was resolved into phenolic and non-phenolic constituents by aqueous sodium hydroxide, and from the phenolic portion, carvacrol and eugenol were definitely isolated and identified. From the non-phenolic portion, eugenol methyl ether was definitely identified, and the presence of caryophyllene was tentatively shown.
The essential oil of
Volume 10 Issue 1 July 1939 pp 55-64
Like violuric acid and diphenyl-violuric acid, isonitroso-3-methyl-isooxazolone and isonitroso-3-phenyl-isooxazolone have been found to form very intense,
This behaviour of the above-mentioned compounds on salt formation has been shown to be due to a fundamental change in the constitution of the molecules from oximino-ketonic to nitroso-enolic forms with consequent changes in the molecular strain and therefore the absorption of these substances.
The change of colour of these substances from colourless to purple or magenta is sufficiently sharp and intense for them to act as excellent indicators.
The validity of the hypothesis with regard to the colour phenomena of the above-mentioned isonitroso-iso-oxazolones is borne out by taking into consideration the organic and inorganic salts of isonitroso-3-methyl-pyrazolone and isonitroso-3-phenyl-pyrazolone. In these substances there is an alternative more acidic but less strained oximino-enolic configuration possible of existence, and consequently the salts of these isonitroso-pyrazolones have less strained structures and their colours also are far less intense than the corresponding salts of the isonitroso-isooxazolones mentioned before, in spite of all of them possessing very closely analogous molecular structures. The behaviour of all these substances therefore lends a further additional proof to the correctness of the “Theory of colour on the basis of molecular strain” advanced by Dutt.
Volume 11 Issue 2 February 1940 pp 96-105
Isonitroso-1∶3-diphenylthio-hydantoin has been obtained for the first time by the action of nitrous acid on 1∶3-diphenylthio-hydantoin.
Isonitroso-diphenylthio-hydantoin has a bright yellow colour in the solid state or in solution in organic solvents, but on treatment with alkalies or organic bases, intense crimson coloured salts are formed the transition of colour from yellow to crimson being sufficiently strong and sharp for the compound to act as an excellent indicator.
The change of colour of the above compound from yellow to crimson has been shown from theoretical considerations to be due to a fundamental change in the constitution of the molecules from an oximinoketonic to a nitroso-enolic form.
The above change is quite in accordance with a “Theory of colour on the basis of molecular strain,” advanced by Dutt.
Volume 11 Issue 6 June 1940 pp 483-490
Mixed or unsymmetrical phthaleins obtained by the condensation of pure
The cause of the above interesting phenomenon has been traced to the existence of less intense tautomerism between the lactonoid and the quinonoid forms of the unsymmetrical phthaleins as compared with those of the symmetrical phthaleins. In some cases the tautomerism only begins to make itself manifested under drastic circumstances, that is in hot solutions of concentrated alkali.
The colour phenomena exhibited by the unsymmetrical and symmetrical phthaleins on treatment with alkali are quite comparable with similar phenomena exhibited by isonitroso-1:3-diphenyl-thiohydantoin and isonitroso-1:3-diphenylthiobarbituric acid under identical conditions as studied by Dutt and his pupils, and due to the same cause.
Volume 12 Issue 3 September 1940 pp 251-265
Volume 14 Issue 1 July 1941 pp 80-84
Volume 14 Issue 2 August 1941 pp 158-164
Volume 16 Issue 2 August 1942 pp 157-162
Volume 16 Issue 5 November 1942 pp 328-331
From the kernels of the seeds of
The sterol has been found to contain an alcoholic hydroxy group, and a number of derivatives of this substance have been obtained.
Volume 19 Issue 4 April 1944 pp 163-166
From the roots of
It has been found to contain a methoxy group and to yield a tetrabromo derivative.
Volume 23 Issue 6 June 1946 pp 325-329
From the bark of
The alkaloid has been found to be a monoacid base containing one methoxy group but no >N−CH3 group.
The alkaloid which is dextrorotatory easily gives crystalline salts with organic and inorganic acids and the hydrochloride, sulphate, nitrate, iodide, acetate, tartrate, oxalate, picrate and iodomethylate have been prepared and described.
Volume 25 Issue 2 February 1947 pp 153-158
From the flowering heads and seeds of
The lactone, which has been named “Scoparin”, has been found to have the molecular formula C16H20O5. It contains an α: β-unsaturation, one ketonic group and two methoxyl groups.
A number of derivatives of the lactone have been prepared and analysed.
Volume 26 Issue 1 July 1947 pp 56-60
From the seeds of
The glucoside and the product of its hydrolysis have been named “Dodonin” and “Dodogenin” respectively.
“Dodogenin” which has a molecular formula C23H36O8 melts at 249°C. and contains a cyclo-penteno-phenanthrene nucleus in its molecule. In general properties it resembles the Sapogenins.
A number of derivatives of “Dodogenin” have been prepared and examined.
Volume 26 Issue 1 July 1947 pp 93-96
From the green herb and the flowering heads of
The essential oil was found to contain eugenol (8.96%), a sesqueterpene (79·44%), a hydrocarbon (2·63%), and residue mainly containing the decomposed products (8·97%).
The sesqueterpene, which has a molecular formula C15H24 has been named “Scoparilene”. It has been found to be different from any known sesqueterpene. Its nitrosate and nitrosite have been prepared and described.