901-44-0Relevant articles and documents
Oligoesters on the basis of hydroxyethylated derivatives of 4,4′-(propan-2,2-diyl)diphenol
Paserb,Bakirova
, p. 1091 - 1094 (2014)
Equilibrium melt polycondensation was used to synthesize a series of oligoethers containing end hydroxy groups, starting with hydroxyethylated derivatives of 4,4′-(propan-2,2-diyl)diphenol and saturated aliphatic dicarboxylic acids. The structure of the oligoethers was assigned, and their physicochemical characteristics and thermal stability were determined.
One-pot alkoxylation of phenols with urea and 1,2-glycols
Lin, Hsing-Yo,Dai, Shenghong A.
experimental part, p. 167 - 173 (2011/04/19)
A one-pot epoxide-free alkoxylation process has been developed for phenolic compounds. The process involves heating phenols and urea in 1,2-glycols at 170-190 °C using Na2CO3/ZnO as co-catalysts under atmospheric conditions. During the course of this new alkoxylation reaction, a five-membered ring cyclic carbonate intermediate, ethylene carbonate (EC) or propylene carbonate (PPC), was produced in-transit as the key intermediate and was subsequently consumed by phenols to form alkoxylated ether alcohols as final products in excellent yields. For instance, phenol, bisphenol A (BPA), hydroquinone and resorcinol were converted into their respective mono-alkoxylated ether alcohols on each of their phenolic groups in 80-95% isolated yields. In propoxylation of phenols, this approach shows great product selectivity favoring production of high secondary alcohols over primary alcohols in isomeric ratios of nearing 95/5. Since ammonia (NH3) and carbon dioxide (CO2) evolving from the reaction can be re-combined in theory into urea for re-use, the overall net-alkoxylation by this approach can be regarded as a simple condensation reaction of phenols with 1,2-glycols giving off water as its by-product. This one-pot process is simple, safe and environmentally friendlier than the conventional alkoxylated processes based on ethylene oxide (EO) or propylene oxide (PO). Moreover, this process is particularly well-suited for making short chain-length alkoxyether alcohols of phenols.
Process for producing bis-alkoxylated diols of bisphenol a from spent polycarbonate discs(PC) or PC waste
-
Page/Page column 3, (2008/12/04)
This invention provides one-pot reaction for digesting polycarbonate waste with alkylene glycol in the presence of a basic catalyst at 180° C. under normal atmospheric pressure. The digested product mixture was found to consist of bisphenol A (BPA) and monoalkoxylated and bisalkoxylated diols of BPA. Alkoxylation of BPA and monoalkoxylated diols of BPA is performed by adding urea or urea derivative (or carbonic acid ester or amine ester) to the digested product mixture at a high temperature under normal atmospheric pressure to obtain the final product, i.e., bisalkoxylated diols of BPA in high yield. The bisalkoxylated diols of BPA may be used as raw materials to synthesize polymer such as polyurethane (PU) or polyester.
