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32 results on '"J. Rao"'

7. ChemInform Abstract: SOME REACTIONS OF THE CHROMENOCHALCONES FROM PONGAMIA GLABRA VENT

Author

K. Subrahmanyam, J. M. Rao, and K. V. J. Rao

Subjects
biology, Chemistry, Pongamia, General Medicine, biology.organism_classification, Medicinal chemistry
Abstract

Die naturlichen Chromenochalkone Lonchocarpin (Ia), Pongachalkon I (Ib), Glabrachromen (Ic) bzw. Glabrachromen′ II (Id) isomerisieren bei langerem Behandeln mit Silicagel in Benzol zu den Chromeno?avanonen Isolonchocarpin (IIa), Isopongachalkon I (IIb), Isoglabrachromen (IIc) bzw. Isoglabrachromen II (IId); diese werden mit Dichlordicyan-p-benzochinon (DDQ) in siedendem Benzol zu den Chromenoflavonen (III) dehydriert; beim Dehydrieren der Verbindungen (II) mit SeO, in siedendem Amylalko- ′ IAC hol entstehen (III) nur in ca. 10%iger Ausbeute.

Published
1977

11. ChemInform Abstract: GLASS TRANSITIONS IN ARSENIC-SELENIUM GLASSES

Author

R Mohan and K. J. Rao

Subjects
Differential scanning calorimetry, Chemistry, Analytical chemistry, chemistry.chemical_element, General Medicine, Arsenic, Selenium
Abstract

Glaiis transitions of As-Se glasses have been investigated over a wide range of compositions by using differential scanning calorimetry. The variation of Tg with composition has been interpreted on the basis of a bond-lattice model.

Published
1980

17. ChemInform Abstract: DIELECTRIC AND ELECTRON SPIN RESONANCE SPECTROSCOPIC STUDIES OF GLASSY CRYSTALLINE STATES OF ORGANIC COMPOUNDS

Author

C. N. R. Rao, R. Parthasarathy, and K. J. Rao

Subjects
Chemistry, Transition temperature, Cyclohexanol, Cyclohexanone, General Medicine, Dielectric, Condensed Matter::Disordered Systems and Neural Networks, law.invention, Condensed Matter::Soft Condensed Matter, Condensed Matter::Materials Science, chemistry.chemical_compound, Nuclear magnetic resonance, law, Phase (matter), Physical chemistry, Electron paramagnetic resonance
Abstract

Dielectric studies of the glassy crystalline states of cyclohexanol, cyclohexanone, and camphor obtained by upercooling the plastic crystalline phase demonstrate the presence of characteristic a- and p-relaxations. The parameters of the a-relaxation fit the Vogel-Tammann-Fulcher (VTF) equation. ESR spin-probe studies of the glassy crystalline phase of cyclohexanol show that there is a marked decrease in the correlation time above the glasslike transition temperature. The present studies suggest the similarity between glassy crystals having long-range orientational disorder and glasses which are known to betra nslationally disordered.

Published
1984

27. ChemInform Abstract: FUSED HETEROCYCLES. IV. SYNTHESIS OF 7-(O-HYDROXYPHENYL)-3,5-DIMETHYL-7,8-DIHYDRO-6H-ISOXAZOLO(4,5-B)AZEPINES

Author

Kooturu Malla Reddi, Ananthula Krishna Murthy, and C. J. Rao

Subjects
chemistry.chemical_compound, Chemistry, Acetylacetone, medicine, Mass spectrum, Michael reaction, chemistry.chemical_element, Hydrochloric acid, General Medicine, Tin, Medicinal chemistry, Chloride, medicine.drug
Abstract

Michael addition of acetylacetone to 3-methyl-4-nitro-5-(o-hydroxystyryl)isoxazoles gives 4-(o-acetoxyphenyl)-5-(3-methyl-4-nitro-5-isoxazolyl)-2-pentanones (4). Reductive cyclization of 4 with tin(II) chloride and concentrated hydrochloric acid leads to 7-(o-hydroxyphenyl)-3,5-dimethyl-7,8-dihydro-6H-isoxazolo[4,5-b]azepines. The formation of 4 has been rationalized through ortho effect. NMR and mass spectra of products have been discussed.

Published
1982

29. ChemInform Abstract: STUDIES ON URANYL ALKALI SILICATE GLASSES

Author

K. J. Rao and H. Senapati

Subjects
chemistry.chemical_compound, chemistry, Inorganic chemistry, General Medicine, Uranyl, Alkali metal, Silicate glass
Abstract

Dunkelbraune ternare Glaser (I) im System Na2O- SiO2-UO3 wurden gemas A mit x = 2, 3, 4, 5 hergestellt.

Published
1983

31. ChemInform Abstract: STUDY OF THE STRUCTURE AND CRYSTALLINITY OF A LITHIUM SILICATE GLASS BY SILICON-29 MAGIC-ANGLE-SPINNING NMR SPECTROSCOPY

Author

John Meurig Thomas, S. Ramdas, Jacek Klinowski, U. Selvaraj, C. N. R. Rao, G. R. Millward, and K. J. Rao

Subjects
Crystallinity, chemistry, Silicon, Analytical chemistry, Magic angle spinning, chemistry.chemical_element, Lithium, General Medicine, Nuclear magnetic resonance spectroscopy, Silicate glass
Abstract

Wie an dem Li-disilicat U20 - 2 SiO2 gezeigt wird, unterscheiden sich die Spin-Gitter-Relaxationszeiten T, der 29Si-Kerne in mikrokristallinen und nicht kristallinen Bereichen stark (Sekunden bzw. Stunden!).

Published
1985

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