Showing papers by "National Chemical Laboratory published in 1973"
TL;DR: In this paper, the properties of ZnS film capacitors were studied at different temperatures (78 to 380 K) and frequencies (102 to 105 Hz) and the dielectric constant was found to be independent of frequency and film thickness (>900 A).
210 citations
TL;DR: Isolation and structure elucidation of a monoterpene phenol, Bakuchiol, from the seeds of Psoralea corylifolia Linn is described in this article.
81 citations
TL;DR: In this article, the first reported occurrence of octadecan-1,2,3,4-tetrols in the gum-resin of Commiphora mukul is described.
52 citations
TL;DR: In this article, 5,7-Dihydroxychromone (II), eriodictyol and luteolin have been isolated from peanut shells (Arachis hypogoea); this is only the second example of a natural chromone unsubstituted in the 2,3 positions.
36 citations
35 citations
TL;DR: A sesquiterpene diol, now named jaeschkeanadiol, has been isolated from the roots of Ferula vechkeana Vatke and is shown to possess structure.
35 citations
TL;DR: In this paper, the authors studied tellurium films formed at various substrate temperatures in order to find their resistance R, activation energy ΔE, Hall coefficient RH, mobility μ, carrier concentration n, thermoelectric power α, TCR etc.
34 citations
TL;DR: Bakuchiol, a terpene phenol from Psoralea corylifolia Linn, has only one asymmetric centre as discussed by the authors, and it has been shown to possess (S)-chirality.
30 citations
TL;DR: In this paper, the divalent ruthenium complexes bearing benzene, mesitylene triphenylbenzene as a π-ligand were prepared and their catalytic activity for olefin hydrogenation was examined.
25 citations
21 citations
TL;DR: In this paper, the inversion process of 9,10,Dihydro-4,5-dimethylphenanthrene was analyzed using the density matrix method, and at various temperatures the calculated line shapes were fitted to the observed spectra to obtain the life-time τ of the Inversion.
TL;DR: In this paper, the infrared spectra of N-methyl- and N,N-dimethylaminobenzoic acids have been investigated, and all the acids except N, N-dimethylanthranilic acid showed neutral structures in the solid state.
TL;DR: In this paper, the stepwise formation constants, enthalpy and entropy changes for the formation of bis-cysteino-Ni(II) chelate have been determined.
TL;DR: In this paper, a synthesis of (±)-bakuchiol methyl ether, involving Claisen rearrangement of geranyl vinyl ether as the key step, is described, and further thermal reorganisation of the intermediate 3-vinyl-citronellal is discussed.
TL;DR: Using 13C NMR spectroscopy, the ring inversion process is analyzed using the modified Bloch equations in this article, and at various temperatures the calculated line shapes are fitted to the observed spectra to obtain the lifetime τ, and at the same time the temperature-dependent chemical shift of each site is estimated.
01 Apr 1973
TL;DR: One concentration approximation method was proposed as a rapid method for determination of the molecular weight and the size of high polymers by light scattering measurement as discussed by the authors, and experiments were made on polystyrene and dextran samples.
Abstract: One concentration approximation method was proposed as a rapid method for determination of the molecular weight and the size of high polymers by light scattering measurement. Experiments were made on polystyrene and dextran samples. The applicability of this method was examined also on the other polymers and the practical utilities were discussed.
TL;DR: In this article, the diffusion model for gas-solid reactions, proposed by Phadtare and Doraiswamy [9] and applied for the oxidation of zinc sulphide by Gokarn et al. for spherical pellets, has been extended to include different geometrical shapes.
TL;DR: In this article, a 12-step sequence of reactions (24 S )-9β,19-cyclo-14α,24-dimethyl-cholest-4-en-3-one) has been obtained from cyclolaudenol in overall yields of 8%.
TL;DR: In this article, the effect of substituents on hydrogen and hydroxyl transfer in substituted benzaldoximes is investigated and a possible explanation in terms of radical electron site and charge site is suggested.
Abstract: The effect of substituents on hydrogen and hydroxyl transfer in substituted benzaldoximes reveals interesting differences. A possible explanation in terms of radical electron site and charge site is suggested.
TL;DR: In this article, the variation in the ratio of the relative abundances of the diene and ene ions formed by competing retro-Diels-Alder reactions with electron energy and subtituents has been studied.
Abstract: The variation in the ratio of the relative abundances of the diene and ene ions formed by competing retro-Diels-Alder reactions with electron energy and subtituents has been studied. This ratio represents the ratio of the rate constants of the processes and depends on the internal energy distribution within the decomposing molecular ions.
TL;DR: In this article, the rates of solvolysis and nucleophilic displacement by 2,2−bipyridyl have been determined for a series of compounds of the type chlorocycloocta-1,5-diene amine rhodium(I).
TL;DR: Nanavati et al. as discussed by the authors investigated the fat of the aril-free seeds of Celastrus paniculatus and, by extraction with 80% MeOH aq., segregated it into glYceride and non glyceride fractions.
TL;DR: The essential oil from the wood of Lansium anamalayanum Bedd. is shown to consist essentially of (−)-α-gurjunene (34%), (−-α- trans -bergamotene (26%) and (−)-β-bisabolene (35%).
TL;DR: In this article, the distribution ratios of β-diketone derivatives and their copper chelates between water and a number of common water-immiscible solvents were investigated.
TL;DR: In this paper, the surface potentials of monomolecular films of n-long chain alkoxy ethanols were measured by the ionizing electrode method at three temperatures (around 15, 20 and 25°C) as a function of surface pressure (π) and area/molecule (A).
TL;DR: In this paper, a coordinate anionic mechanism was proposed for styrene polymerization with chromium acetylacetonate-triisobutylaluminum catalyst at 40°C in a benzene medium.
Abstract: Styrene is polymerized with chromium acetylacetonate–triisobutylaluminum catalyst at 40°C in a benzene medium. At the stoichiometric ratio of Al/Cr of 4, the activity for polymerization was found to be maximum. Further, the kinetic studies were carried out at this ratio of Al/Cr of maximum activity. The kinetics of polymerization and the total activation energy around 10.00 kcal/mole suggest a coordinate anionic mechanism.