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Hammett spectral correlations in some aryl 1,3-oxazine-4-thione derivatives

Thirunarayanan G., Sekar K. G.

International Letters of Chemistry, Physics and Astronomy

2014

Vol. 17, iss. 2

193--200

A series of some aryl 1,3-oxazine-4-thione derivatives have been synthesized by 1-methyl imidazole catalyzed three component one pot synthetic method in room temperature. The purities of these thiones were studied by their physical constants and spectroscopic data. The infrared and 13C NMR spectral data of CN and CS were correlated with Hammett substituent constants, F and R parameters using single and multi-linear regression analysis. From the results of statistical analysis, the effect of substituent on the spectral data was studied.

Tetracyclic Triterpenes. XVII. The Inverted Conformation of Ring A and B in Stereoids: 3-Substituted-4-oxo-14alfa-methyl-5beta-cholest-8-enes

Joachimiak R., Martynow J., Paryzek Z.

Polish Journal of Chemistry

2003

Vol. 77 / nr 11

1599-1606

Full assignment of 13C NMR shifts for a series of _8-5_- and 5_-steroids is presented. These data along with some characteristic features of 1H NMR and IR spectra are in accordance with inverted conformation of Aand B rings in 4-oxo-5_-steroids 5 and 6 in solution. Configuration at C-3 is important for inversion of Aand B ring conformation of _-methyl ketones 6 and 7, while the intramolecular hydrogen bonding appears to be responsible for the inverted, slightly distorted chair conformation of ring A in _-hydroxy ketone 5.

Synthesis, Nuclear Magnetic Resonance and Infrared Studies of Zinc(II) and Cadmium(II) Complexes of Thiosemicarbazones Derived from Fluorenone and p-Anisaldehyde

Akinchan N., Drożdżewski P. M., Akinchan R.

Polish Journal of Chemistry

2002

Vol. 76 / nr 10

1381-1387

Fluorenone (FTSCH) and p-anisaldehyde (ATSCH) thiosemicarbazones react with zinc(II) and cadmium(II) acetates forming M:L 1:2 complexes, characterized by IR, 1H and 13C NMR spectra and elemental analyses. The coordination mode of the ligands is discussed and four-coordinate, pseudo-tetrahedral structures are suggested.