Showing papers by "Sujit Roy published in 2003"
TL;DR: In this article, the ideal conditions for grinding agglomerated powders into a fine one were fixed from the results of a combined study of zeta potential and viscosity evaluations.
59 citations
TL;DR: Facile homopropargylation of aldehydes by propargyl bromides over tetragonal tin(II)oxide and catalytic palladium(0) occurs which is proposed to involve the prior formation of dinuclear allenylpalladium followed by redox transmetallation to beta-SnO.
24 citations
TL;DR: Barbier-type γ-regiospecific allylation of formylferrocene (1) with allyl bromides in the presence of stannous chloride dihydrate and catalytic cupric chloride in dichloromethane-water (1:1) afforded corresponding ferrocenyl dienes.
8 citations
TL;DR: In this article, four different methods of synthesizing Al 2 O 3 /Al-IPN using exothermic reactions are reviewed and some data on properties are collected from available literature and on the basis of these values, a few applications are indicated.
Abstract: Interpenetrating network (IPN) composites containing Al 2 O 3 and Al phases constitute a novel class of materials that exhibit connectivity of both the phases in all directions and as a result, possess interesting properties which can be designed to suit specific applications. Reaction-induced methods of fabrication of such materials are considered economical and provide opportunity for optimizing phase contents. Four different methods of synthesizing Al 2 O 3 /Al-IPNs using exothermic reactions are reviewed. The important aspects of thermodynamics of exothermic systems, wetting phenomenon in solid-liquid contacts and control of porosity in solid-gas reaction are discussed. Some data on properties are collected from available literature and on the basis of these values, a few applications are indicated.
5 citations
TL;DR: In this article, the authors show that the nitrodecarboxylation of aromatic α,β-unsaturated carboxylic acids and ring-activated benzoic acids can be achieved using nitric acid (3 equiv) and catalytic AIBN (2 mol %) in MeCN.
Abstract: The nitrodecarboxylation of aromatic α,β-unsaturated carboxylic acids and ring-activated benzoic acids can be achieved using nitric acid (3 equiv) and catalytic AIBN (2 mol %) in MeCN. From the effect of various additives, the nitrodecarboxylation is postulated to involve the generation of an acyloxy radical RCO2• by a NO3• radical followed by attack of a NO2• radical.
2 citations
TL;DR: In this paper, the relative efficiency of triethylamine, tetrabutylammonium trifluoroacetate, and lithium acetate as catalysts for the conversion of 4-methoxycinnamic acid to 4mETHoxy-β-bromostyrene was evaluated.
Abstract: UV-vis spectrophotometry is utilized to measure the relative efficiency of lithium acetate, tetrabutylammonium trifluoroacetate, and triethylamine as catalysts for the conversion of 4-methoxycinnamic acid to 4-methoxy-β-bromostyrene. In acetonitrile-water as solvent, the efficiency order is lithium acetate > triethylamine > tetrabutylammonium trifluoroacetate. For triethylamine as catalyst, solvent-dependent order is acetonitrile-water > dichloromethane > acetonitrile. Using triethylamine as catalyst (5-20 mol %), cinnamic acids, and propiolic acids are converted to corresponding β-bromostyrenes and 1-halo-1-alkynes in 60-98% isolated yields within 1-5 min.