Glycols cyclic carbonates

Ethylene glycol, cyclic carbonate, 103, 107, 126, 127, 130 reaction of, with phosgene, 112 stability of, 144... 

ETHYLENE GLYCOL CYCLIC CARBONATE (96-49-1) Combustible liquid (flash point 289°F/143°C). Reacts with strong oxidizers. Incompatible with fluorine, germanium, lead diacetate, magnesium, mercurous chloride, nitrates, silicon, silver nitrate, titanium. 

Ai3-18365 Carbonic acid, cyclic ethylene ester CCRIS 293 Cyclic ethylene carbonate Dioxolone-2 EINECS 202-510-0 Ethylene carbonate Ethylene carbonic acid Ethylene glycol carbonate Ethylene glycol, cyclic carbonate Ethylenester kyseiiny uhlicite Glycol carbonate HSDB 6803 NSC 11801 Texacat EC. Solvent for organic and Inorganic material ERA Rule 66 exempt also used as reactant and plasticizer in fibers and textiles, plastics and resins, aromatic hydrocarbon extraction, electrolytes, hydraulic brake fluids. Plates mp = 36.4" bp = 248° = 1,3214 freely soluble in H2O,... 

CAS 108-32-7 EINECS/ELINCS 203-572-1 Synonyms Carbonic acid, cyclic propylene ester Carbonic acid, 1,2-propylene glycol ester 1,3-Carbon dioxypropane Cyclic methyleth-ylene carbonate Cyclic propylene carbonate Cyclic 1,2-propylene carbonate 1,3-Dioxolan-2-one, 4-methyl Dipropj ene carbonate 4-Methyl-1,3-dioxolan-2-one 1-Methyl ethylene carbonate 1,2-Propanediol carbonate 1,2-Propanediyl carbonate 1,2-Propylene carbonate Propylene glycol cyclic carbonate Classification Qrganic compd. carbonic acid ester Empirical C,HsQ,... 

Propylene glycol cyclic carbonate. See Propylene carbonate... 

CAS 96-49-1 EINECS/ELINCS 202-510-0 Synonyms Carbonic acid, cyclic ethylene ester 1,3-Carbonyldioxyethane Cyclic ethylene carbonate 1,3-Dioxolan-2-one Dioxolone-2 1,2-Ethanediol carbonate Ethylene carbonic acid Ethylene glycol carbonate Ethylene glycol cyclic carbonate Glycol carbonate Classification Carbonic acid ester Empirical C3H4O3 Formula (-CH20)2C0... 

Propylene glycol cyclic carbonate. See Propylene carbonate Propylene glycol diacetate CAS 623-84-7 EINECS/ELINCS 210-817-6 Synonyms 1,2-Diacetoxypropane a-Propylene glycol diacetate Empirical C7H13O4... 

In our previous works[8,9] on the synthesis of various 5-membered cyclic carbonate, quaternary ammonium salts such as tetrabutylammonium halides showed excellent catalytic activities in relatively mild reaction conditions, under atmospheric pressure and below 140 U. hi this work, several kinds of quaternary ammonium salts have been used for the transesterification reactions of the ethylaie carbonate with methanol to DMC and ethylene glycol. 

A novel chemoenzymatic route to polyester polyurethanes was developed without employing highly toxic isocyanate intermediates. First, diurethane diols were prepared from cyclic carbonates and primary diamines, which were subsequently polymerized with dicarboxylic acids and glycols by using lipase CA as catalyst, yielding the polyurethanes under mild reaction conditions. 

C. At higher temperatures main-chain scission occurs, but the pathways still needs to be clarified. Cyclic carbonate may also be formed (e.g., after hydrolysis with residual water), but not necessarily. CO2 and propylene glycol may result as products. Thermally more stable PPC may be processed at temperatures over 250°C as long as exposure time is short (minutes). 

Cyclic carbonates are made by treating 1,2-diols with dialkyl carbonates using an alkyl ammonium and tertiary amine catalyst. The combination of propylene glycol and dimethyl carbonate has been reported to result in a 98% yield of propylene carbonate (21). 

Cyclic carbonates are prepared in satisfactory quality for anionic polymerization by catalyzed transesterification of neopentyl glycol with diaryl carbonates, followed by tempering and depolymerization. Neopentyl carbonate (5,5-dimethyl-l,3-dioxan-2-one) (6) prepared in this manner has high purity (99.5%) and can be anionically polymerized to polycarbonates with mol wt of 35,000 (39). 

In contrast to the copolymerization of cyclic carbonates, the molecular weights are lower in the epoxide copolymerization 6,41 43). We assume that this is due to the presence of proton donors in the reaction mixture. They occur as impurities in epoxides 19,20) or anhydrides, moisture in all components of the copolymerization system, or their presence is a consequence of the high rate of hydrolysis of cyclic anhydrides 21). Proton donors added to the monomer feed remarkably decrease the molecular weight42 even in the copolymerization of ethylene glycol carbonate at 200 °C. Under these conditions, when recyclization of phthalic acid takes place 64) and the released C02 can tear off moisture to the gas phase, the molecular weight Mv decreases without proton donors from 45200 to 7100 in the presence of 5% phthalic acid or ethylene glycol or to 9300 in the presence of 15% water42,54. ... 

A better AE value (59wt%) is obtained with the coproduction of ethylene glycol from the methanolysis of ethylene carbonate (entry 2). The AE value is higher when water is coproduced (83 wt %, entries 4—5). The use of urea as a feedstock (entry 3) may also lead to AE = 83 wt%, by coupling the urea synthesis equation. The complete use of feedstock atoms (AE = 100 wl%) has been demonstrated commercially for cyclic carbonate synthesis, but as yet no real case has been reported for unstrained ethers (entry 6). 

Dunach, Inesi and others also investigated the electrochemical synthesis of cyclic carbonates from C02 with epoxides, alcohols and glycols [66]. In this regard, Yang et al. [67] reported the use of pure room temperature ionic liquids (ILs) as reaction media in the electrochemical activation of C02 for the synthesis of cyclic carbonate from epoxide, under mild conditions. C02-saturated IL (BMIMBF4) solutions were also used for the electrochemical carboxylation of activated olefins [68]. Monocarboxylic acids were obtained in moderate yield (35-55%), and the IL was recycled five times. 

N,N -carbonyldiimidazole (CDI) 29 is used to protect the 3- and 4-OH group of the galactal 6 as a cyclic carbonate.6 The first report of a cyclic carbonate was in 1883 by Nemirowsky He treated ethylene glycol with phosgene (30). Phosgene is known as a highly toxic... 

Into a vessel provided with efficient stirring means there are gradually introduced, while maintaining the temperature at 40°C, 535.0 g of benzylamine and 440.0 g of cyclic carbonate of glycol. The mass obtained is maintained at a temperature 40-50°C for about 12 h. Upon cooling, there is obtained a glycol benzylcarbamate as a white crystalline, melting point at 40°C, yield 92%. 

Keywords Carbon dioxide Polyethylene glycol C02 transformation Cyclic carbonates Dimethylcarbonate Oxazolidinones Organic carbamates Urea derivatives... 

Wang JL, He LN, Dou XY et al (2009) Poly (ethylene glycol) an alternative solvent for the synthesis of cyclic carbonate from vicinal halohydrin and carbon dioxide. Aust J Chem 62(8) 917-920... 

Many solvents can be spoiled during prolonged storage, which requires redistillation before use. For example, ethers exposed to oxygen develop peroxide contamination, and cyclic carbonates may decompose to derivatives of their mother glycols and C02. 

Nemirowsky, in 1883, reported the preparation of the cyclic carbonate ester I from ethylene glycol and phosgene, and, in 1909, Siegfried and... 

Esters of carboxylic acids are, in general, not suitable starting materials for the synthesis of fluorides because the ester group cannot be substituted by fluorine. However, ft- and y-fluoro alcohols 1 and 2 can be obtained by treatment of the cyclic carbonates of 1.2- and 1,3-glycols, respectively, with anhydrous potassium fluoride. 

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