Photocatalytic activity of mixed-phase of TiO2 synthesized by non-aqueous methodology

768-774A mix-phase (anatase-rutile) nanocrystalline titania particles were successfully synthesized in a non-aqueous solvent medium using a novel approach of controlled hydrolysis of titanium isopropoxide. The hydrolysis was carried out by the controlled release of water molecules from simple Schiff base formation reaction of anisaldehyde employing aniline as an amine component in isopropanol solvent medium. The excess aniline used, and the imine formed acts as directing agents. The photocatalytic activities of the catalysts prepared were compared with Degussa P25 for methylene blue degradation in direct sunlight. The photocatalytic activity was found to increase with decreasing availability of water molecules formed during the Schiff base formation (imination) reaction. Also, it was found to affect the phase and shape selection. TEM images show sphere-like to hexagonal to a rod-shaped formation of particulates

Unique synthesis of isochromenoindolone <em>via</em> reductive-oxidative cyclisation approach</span>

104-108A unique reductive-oxidative cyclisation approach for synthesis of isochromeno[4,3-b]indol-5(11H)-one from nitrostrylbenzoate is described

Iodine-Mediated Intramolecular Dehydrogenative Coupling: Synthesis of <i>N</i>‑Alkylindolo[3,2‑<i>c</i>]- and -[2,3‑<i>c</i>]quinoline Iodides

An I₂/TBHP-mediated intramolecular dehydrogenative coupling reaction is developed for the synthesis of a library of medicinally important 5,11-dialkylindolo­[3,2-<i>c</i>]­quinoline salts and 5,7-dimethylindolo­[2,3-<i>c</i>]­quinoline salts. The annulation reaction is followed by aromatization to yield tetracycles in good yield. This protocol is also demonstrated for the synthesis of the naturally occurring isocryptolepine in salt form

PDC-Mediated Tandem Oxidative–Wittig Olefination

<div><p></p><p>A convenient tandem oxidative–Wittig olefination of a primary alcohols to α,β-unsaturated compounds using pyridinium dichromate (PDC) is described.</p> </div

An efficient synthesis of <img src='/image/spc_char/alpha.gif'>-(alkylidene)-5, 5-dimethyl-<img src='/image/spc_char/delta1.gif'>-lactones

1333-13362-(-Alkylidene substituted)-5,5-dimethyl--lactones have been synthesized in two steps. The stable phosphorane carboethoxy­methyledene (-prenyl)-triphenylphosphorane is condensed with different carbonyl compounds to afford ,-unsaturated esters which are cyclised using PPA to give title compound

A convenient synthesis of <img src='/image/spc_char/gamma.gif' border=0>-methyl <img src='/image/spc_char/alpha.gif' border=0> -(alkylidene)-<img src='/image/spc_char/gamma.gif' border=0>-butyrolactones

1505-1508-Methyl- -(alkylidene substituted)--butyrolactones have been synthesized in two steps. The anion of allyl phos­phonate 1 is condensed with different carbonyl compounds to afford ,-unsaturated esters 2a-gwhich are cyclised using 6N HCl to give title compounds