Coating compositions that provide hydrophilic and self-cleaning properties upon exposure to an electromagnetic spectrum are disclosed. Coatings can include lignin-coumarate derivatives and/or lignin-azobenzene derivatives. When exposed to the electromagnetic spectrum, these compounds isomerize to cis-configuration which are hydrophilic in nature as compared to when these compounds are in their hydrophobic trans-state.
Thiourea catalyzed aminolysis of epoxides under solvent free conditions. Electronic control of regioselective ring opening
作者:Swapandeep Singh Chimni、Neeraj Bala、Vaibhav A. Dixit、Prasad V. Bharatam
DOI:10.1016/j.tet.2010.02.053
日期:2010.4
A reactant economizing process for the regioselective aminolysis of epoxides using equimolar quantities of reactants catalyzed by the double hydrogen bond donor N,N'-bis[3,5-bis(trifluoromethyl)phenyl]thiourea is reported. Regioselectivity of the reaction is controlled by the electronic nature of the substituent on the styrene oxide, which has been substantiated on the basis of C-13 NMR data and DFT calculations. (C) 2010 Elsevier Ltd. All rights reserved.
An efficient protocol for regioselective ring opening of epoxides using sulfated tungstate: application in synthesis of active pharmaceutical ingredients atenolol, propranolol and ranolazine
作者:Sagar P. Pathare、Krishnacharya G. Akamanchi
DOI:10.1016/j.tetlet.2013.09.065
日期:2013.11
Sulfated tungstate was found to be a new and highly efficient catalyst for opening of epoxide rings by amines to give beta-amino alcohols with high regioselectivity. Various advantages associated with this novel and environmental friendly protocol include solvent-free conditions, short reaction times, high product yields, simple workup procedure and easy recovery and reusability of the catalyst. This protocol has been applied for the synthesis of active pharmaceutical ingredients atenolol, propranolol and ranolazine. (C) 2013 Published by Elsevier Ltd.
Microwave‐Assisted Cleavage of Epoxides with Amines in the Presence of the Catalytic Zn(OAc)<sub>2</sub>/1,7‐Bis(2‐Benzoic Acid)‐1,4,7‐Trioxaheptane (ZnBBATOH)
We describe a highly regioselective ring opening of epoxides with aromatic amines in the presence of a catalytic amount of Zn(OAc)(2) and 1,7-bis(2-benzoic acid)-1,4,7-trioxaheptane under microwave irradiation. The yields of the amino alcohols a-re mostly good and the recovered catalyst could be reused several times.
FURUKAWA MITSURU; OHKAWARA TADASHI; NOGUCHI YOSHIHIDE, CHEM. AND PHARM. BULL., 1978, 26, NO 11, 3556-3558