Proceedings of the Indian Academy of Sciences - Section A

Singh, Bawa; Singh Manhas, Kanwar

doi: 10.1007/BF03173435pmid: N/A

1. The rotatory dispersion of stereoisomeric salts ofo-, m-, p- amino benzoic acids,p-aminoazobenzene ando-toluoazo-o-toluidine with camphor β-sulphonic acids is found, in different solvents, to obey Drude's one-term equation, $$[a] = \frac{{K_0 }}{{\lambda ^2 - \lambda _0 ^2 }}$$ ; it is, therefore, simple. 2. Thed- andl-forms of these compounds possess identical rotatory power and thus further support Pasteur's law of Molecular Dissymmetry. 3. The sequence of the rotatory power in the case of salts ofo-, m-, p-amino benzoic acids with camphor-β-sulphonic acids in different solvents runs exactly in the reverse order of the dielectric constants of the solvents, whereas the sequence of the rotatory power of salts ofp-aminoazobenzene with camphor-β-sulphonic acids follows exactly the same order as the dielectric constant of the solvent. 4. The influence of carboxyl group or rotatory power has been discussed and its polar effect on the rotatory power of the compounds traced. 5. The effect of the replacement of H by the azo aryl group is to depress the rotatory power of the parent compound. 6. The effect of position isomerism on rotatory power has also been discussed.

Dixit, V.; Mulay, L.

doi: 10.1007/BF03173436pmid: N/A

Resorcin has been condensed with acetone dicarboxylic acid in the presence of sulphuryl chloride as the condensing agent. A new dibasic acid has been isolated from the condensation product. In view of the results obtained by submitting the new acid to several reactions it is considered to be the trans isomer of β-2: 4-dihydroxy phenyl glutaconic acid.

Hattiangdi, G.

doi: 10.1007/BF03173437pmid: N/A

Measurements of the opacity changes with time taking place during the gel-formation of some soap-pinene systems yield opacity-time curves which change their nature considerably with variations in concentration. The curves obtained for systems of high concentrations are S-shaped whereas those for low soap content show a distinct change in direction after the S-shaped stage is reached. The curves for sodium oleate and sodium stearate gels in pinene are very similar in their general characteristics but the opacity values for the sodium palmitate-pinene systems remain constant throughout the process of gel-formation. An attempt has been made to correlate the data with the manner in which the size, number and degree of solvation of the colloidal particles change during gelation.

Karunakaran, C.; Neelakantam, K.

doi: 10.1007/BF03173438pmid: N/A

1. A typical sample of samarskite has been analysed and the results reported. 2. The thoria content of the sample is 1·98%. 3. The percentage of cerium earths present in this sample is relatively much smaller than found in samples from North America. Our sample contains 0·4% ceria. 4. Hexavalent uranium has not been found in the sample but this is of no special significance. 5. The radium contents is 1·0 gr. in 39· 71 tons and the Nellore samarskite is nearly as rich as Katanga Carnotite in this element.

Murti, V.; Row, L.; Seshadri, T.

doi: 10.1007/BF03173439pmid: N/A

The simpler chromones having no side phenyl ring have poor toxic properties and resemble the simpler coumarins. Hydroxy isoflavones are more toxic than the corresponding flavones and the methoxy derivatives less toxic. In this there is resemblance to the hydroxy- and methoxy-phenyl coumarins. Among allyl-derivatives of chromones, flavones and isoflavones, ethers have high toxicity.

Narasimhachari, N.; Row, L.; Seshadri, T.

doi: 10.1007/BF03173440pmid: N/A

The possibility of orthor nuclear oxidation in the flavone series has been tested using 7-hydroxy-flavone and 3-methoxy-7-hydroxyl-flavone. By means of alkaline persulphate 7: 8-dihydroxy-flavone (10% yield) and 3-methoxy-7: 8-dihydroxy-flavone (20% yield) could be obtained. This seems to offer an easier method of preparing the flavonol, 3: 7: 8-trihydroxy flavone. The intermediate stage of the sulphate could be isolated pure from 7-hydroxyflavone.

Radhakrishnan, T.

doi: 10.1007/BF03173441pmid: N/A

Rao, P.

doi: 10.1007/BF03173442pmid: N/A

The tamarind seed testa contains about 32 per cent. of tannins of which 35 per cent. is phlobatannin, the rest being mostly catechol tannin. The phlobatannin yields almost colourless methyl and acetyl derivatives which exhibit marked optical activity, supporting the idea that phlobatannins are probably hydroxy flavan derivatives.

Karmarkar, K.

doi: 10.1007/BF03173443pmid: N/A

It is shown that every gravitational metric of spherical symmetry is in general of class two. A necessary and sufficient condition for the metric to be of class one is obtained in several forms. The limitations imposed by the condition on possible perfect fluid distributions are discussed.

Singh, Bawa; Nayar, Bal

doi: 10.1007/BF03173444pmid: N/A

1. The rotatory dispersion ofd- andl-camphorcarboxylic acids in 8 solvents is described. The dispersion is simple and obeys the one-term Drude equation. 2. The effect of solvents on the rotatory power is discussed. 3. The effect of constitution on rotatory power of camphorcarboxylic acid is also discussed. 4. Thed- andl-forms give identical rotation within the limits of experimental error and thus support Pasteur's Law of Molecular Dissymmetry. 5. The formula for the complex dispersion ofd- andl-camphors in ethyl alcohol has been recalculated. The simple rotatory dispersion formulæ forl-borneol in ethyl alcohol and benzene have also been calculated.