- Oligoesters on the basis of hydroxyethylated derivatives of 4,4′-(propan-2,2-diyl)diphenol
-
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.
- Paserb,Bakirova
-
-
Read Online
- Exploring thiol-yne based monomers as low cytotoxic building blocks for radical photopolymerization
-
The last decade has seen a remarkable interest in the development of biocompatible monomers for the realization of patient specific medical devices by means of UV-based additive manufacturing technologies. This contribution deals with the synthesis and investigation of novel thiol-yne based monomers with a focus on their biocompatibility and also the mechanical properties in their cured state. It could be successfully shown that propargyl and but-1-yne-4-yl ether derivatives have a significant lower cytotoxicity than the corresponding (meth)acrylates with similar backbones. Together with appropriate thiol monomers, these compounds show reactivities in the range of (meth)acrylates and almost quantitative triple bond conversions. A particular highlight is the investigation of the network properties of photo cured alkynyl ether/thiol resins by means of low field solid state nuclear magnetic resonance spectroscopy. Additionally, dynamic mechanical analysis of those polymers revealed that monomers containing rigid backbones lead to moduli and glass transition temperatures (Tg's), sufficiently high for the fabrication of medical devices by UV based additive manufacturing methods.
- Oesterreicher, Andreas,Ayalur-Karunakaran, Santhosh,Moser, Andreas,Mostegel, Florian H.,Edler, Matthias,Kaschnitz, Petra,Pinter, Gerald,Trimmel, Gregor,Schl?gl, Sandra,Griesser, Thomas
-
p. 3484 - 3494
(2016/09/23)
-
- One-pot alkoxylation of phenols with urea and 1,2-glycols
-
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.
- Lin, Hsing-Yo,Dai, Shenghong A.
-
experimental part
p. 167 - 173
(2011/04/19)
-
- Alkoxylation process for preparing ether alkanol derivatives of phenolic compounds
-
This invention provides an alkoxylation process for creating alkoxylating chain extension of phenolic compounds by reacting phenolic compounds with alkylene glycol and urea in the presence of suitable catalysts to obtain alkoxylated compounds, which may be used as polymer intermediates, especially for use as raw materials to synthesize polyurethane (PU) or polyester.
- -
-
Page/Page column 2-3
(2008/12/07)
-
- Process for producing bis-alkoxylated diols of bisphenol a from spent polycarbonate discs(PC) or PC waste
-
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.
- -
-
Page/Page column 3
(2008/12/04)
-
- DENTAL COMPOSITIONS CONTAINING OXIRANE MONOMERS
-
Epoxy-functional ether monomers (i.e., oxirane monomers) for use in oxirane-based dental compositions.
- -
-
Page/Page column 26
(2008/06/13)
-
- Aromatic ethers and process for producing aromatic ethers
-
According to a production process, aromatic ethers are producible by reacting phenols with an oxirane compound with use of an anion exchange resin as a catalyst. According to another production process, aromatic ethers having an alcoholic hydroxyl group are producible by a crystallization-purification step of using a solvent having a solubility parameter ranging from 7.5 to 12.5 for purification by crystallization. Further, according to still another production process, producible are aromatic ethers having an alcoholic hydroxyl group, wherein the content of a metal in the aromatic ethers is less than 100 ppm by mass, and the content of a halogen element in the aromatic ethers is less than 100 ppm by mass.
- -
-
-
- Synthesis of new crown analogs derived from bisphenol
-
Synthesis of hexaoxa 5, octaoxa 6 and tetradiaza macrocycle 7 has been accomplished by reacting bisphenol 1 with tosylates 2,3 and 4 respectively, under basic conditions. Dithia-bridged macrocycles 10 and 13 are prepared by reacting key-intermediates, ditosylate 9 and diiodo compound 12, respectively with Na2S.9H2O. Attempted metal ion complexation and two phase extraction with macrocycles 5, 6, 10 and 13 was unsuccessful probably due to insufficient ligating potential available with these macrocycles.
- Kumar, Sukeerthi,Mashraqui, Sabir H.
-
p. 656 - 661
(2007/10/03)
-
- Process for alkoxylation of phenols
-
Hydroxyalkylphenyl ether compounds are prepared by reaction of cyclic organic carbonate compounds with phenols in the presence of potassium iodide catalyst.
- -
-
-