89794-02-5Relevant articles and documents
A new recoverable Au(III) catalyst supported on magnetic polymer nanocomposite for aromatic bromination
Li, Bai,Gao, Linfeng,Bian, Fengling,Yu, Wei
supporting information, p. 1063 - 1066 (2013/04/10)
This Letter presents a facile alternative synthesis of a recoverable Au(III) catalyst supported on Fe3O4@SiO 2~MPS grafted by poly(N-vinyl-2-pyrrolidone) (PVP). The solid magnetic support was prepared by anchoring 3-methacryloxypropyltrimethoxysilane (MPS) onto the Fe3O4@SiO2 surfaces followed by free radical polymerization with N-vinyl-2-pyrrolidone. Au(III) was immobilized onto the magnetic support in aqueous media to afford Au(III)/Fe 3O4@SiO2~PVP (catalyst 1). Catalyst 1 was characterized by FT-IR, TEM, VSM, TGA, XRD, and ICP-AES. The amount of Au in catalyst 1 was measured to be 0.64 wt % by ICP-AES. This newly prepared catalyst can catalyze the aromatic bromination reaction with comparable activity as homogeneous AuCl3. Moreover, the supported catalyst is easy to recover and can be used in four cycles without apparent loss of activity.
Kinetics of nuclear chlorination of toluene and some substituted toluenes by trichloroisocyanuric acid
Panda, H. P.,Sahoo, K. K.
, p. 717 - 720 (2007/10/02)
Nuclear chlorination of toluene and substituted toluenes by trichloroisocyanuric acid is first order each in and .The observed second order rate constants increase with increase in +> in solvent mixtures containing less than 50percent HOAc.The k2 values increase with an increase in the proportion of HOAc, reach maximum at 50percent HOAc above which the rate constants have a diminishing trend.At higher proportion of HOAc, the rate constants are insensitive to change in .Added Cl- ions enhance the rate.Based on the observed results a plausible mechanism has been proposed which envisages a positive ion dipole reaction between H+2OCl generated from hydrolysis of TCICA and the substrate molecules at low proportions of HOAc.At high proportion of HOAc, chlorine acetate has been suggested to be the electrophile.Molecular chlorine as well as H2O+Cl are the chlorinating species in the presence of Cl- ions.The Hammett plot is linear with a ρ value -5.55.The activation parameters have been computed.
Iminodimethylene di-tert-alkylophenones and phenols
-
, (2008/06/13)
Substituted-iminodimethylene-di-tert-alkylophenones, e.g., 4", 4"'-methyliminodimethylene-dipivalophenone, are prepared by treating a corresponding α-halo-p-tert-alkanoyl toluene with a substituted amine. The phenylcarbinols are prepared from the corresponding phenones and both the phenones and the phenylcarbinols are useful as hypolipidemic agents.