Synthesis and stereochemical studies of some 4,4-diethoxycarbonyl-2,6-diaroyl-3,5- diarylthiane-1,1-dioxides

376-377<span style="font-size:16.5pt;mso-bidi-font-size:8.5pt; font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">Michael addition of diethyl malonate over 2,2'-sulfonyl-bis(1,3-diarylprop-2-en-1-ones 1a-e in the presence of sodium ethoxide furnish 4,4-diethoxycarbonyl-2,6-diaroyl-3,5-diarylthiane-1,1-dioxides 2a-e in very good yields. The stereochemistry of 2a-e has been deduced from 1H NMR spectroscopic data.</span

Through-space interaction of sulphur in lanthanide(III) complexes of (phenylthio)acetic acid

754-756The (phenylthio)acetates of lanthanum(III), praseodymium(III ), neodymium(III), samarium(III), gadolinium(III), terbium(III) and dysprosium(III) have been synthesized and characterized by elemental analysis, spectroscopic, magnetic and thermal data. The IR data show that the carboxylato group is bonded to the metal ion in a bidentate chelate mode. A coordination number of seven is suggested for the rare earth metal ions in these complexes. Through-space interaction or sulphur has been suggested for the low M-L covalency in these complexes

<span style="font-size:12.0pt;font-family: "Times New Roman";mso-fareast-font-family:"Times New Roman";mso-ansi-language: EN-IN;mso-fareast-language:EN-IN;mso-bidi-language:AR-SA" lang="EN-IN">A synthetic and stereochemical study of 2,6- diaroyl-3,5-diaryltetrahydro- 1,4-thiazine-1,1-dioxides</span>

962-963<span style="font-size:12.0pt;font-family: " times="" new="" roman";mso-fareast-font-family:"times="" roman";mso-ansi-language:="" en-in;mso-fareast-language:en-in;mso-bidi-language:ar-sa"="" lang="EN-IN">Aza-Michael addition of ammonia to 2,2'-sulfonylbis(1,3-diarylprop-2-en-1-ones) in dimethylformamide afford 2,6-diaroyl-3,5-diaryltetrahydro-1 ,4-thiazine-1, 1-dioxides in excellent yields. The structure and stereochemistry of the compounds have been deduced from elemental analysis and spectral data.</span