Ethylene glycol formal

Synonyms 1,3-dioxacyclopentane ethylene glycol formal formal glycol... 

Synonyms Dihydro-1,3-dioxole 1,3-Dioxacyclopentane 1,3-Dioxolan Dioxolane Ethylene glycol formal Formal glycol Glycoformal Glycol formal Glycol methylene ether Classification Sat. cyclic aliphatic ether Empirical C3H6O2... 

Macrocyclization of esters of allylglycine with diols has been successfully used to prepare derivatives of 2,7-diaminosuberic acid [861,864]. The latter are surrogates of cystine, and therefore of interest for the preparation of peptide mimetics. For unknown reasons protected allylglycine derivatives can not be directly dimerized by self metathesis [864]. However, catechol [864], ethylene glycol [861], and 1,2- or 1,3-di(hydroxymethyl)benzene derivatives [860] of allylglycine are suitable templates for the formal self metathesis of this amino acid via RCM. 

Reaction of 1,2-dimethylcyclohexene with the ethylene glycol acetal of acrolein in methylene chloride in the presence of 25 mol % of BF3.0Et2 at -78 to -10°C for 2 hours gives a 70% yield of the cycloadduct 1 in a formal 2k + 2% intermolecular cycloaddition. All of the evidence for this and related reactions, however, indicates a stepwise mechanism for the formation of 1. 

The copolymerization between trioxane and suitable comonomers (ethylene oxide, 1,3-dioxolane, diethylene glycol formal, 1,4-butane diol formal in amounts of 2-5% by weight) is performed using cationic initiators. The cationic initiators could be Lewis acids, such as BF3 or its etherate BF3Bu20 which was used, for example by Celanese (the mechanism of this reaction was studied in detail [163,164]) or protic acids such as perchloric acid, perfluoroalkane sulfonic acids and their esters and anhydrides. Heteropoly acids were used and also a series of carbenium, oxocarbenium salts, onium compounds, and metal chelates. To regulate the molecular weight chain-transfer agents, such as methylal and butylal, are added. 

Formal oxidation a to the cyclopropane ring has also been achieved by cationic rearrangements that take place during solvolysis of various />-toluenesulfonates" - and a dichlo-ride with a cyclopropane p to the sulfonate group and the chloro atoms, respectively. Formally, a similar reaction took place when 5-dibenzosemibullvalenecarbaldehyde tosylhy-drazone in ethylene glycol was treated with butyllithium, but in this case a carbene intermediate is conceivably involved. ... 

Polystyrene is the name of a homopolymer made from the single monomer styrene. When the name of a monomer comprises two or more words, the name should be enclosed in parentheses, as in poly(methyl methacrylate) or poly(4-bromostyrene) to identify the monomer more clearly. This method can result in several names for a given polymer thus, poly(ethylene glycol) , poly(ethylene oxide) and poly(oxirane) describe the same polymer. Sometimes, the name of a hypothetical monomer is used, as in poly(vinyl alcohol) Even though a name like polyethylene covers a multitude of materials, the system does provide understandable names when a single monomer is involved in the synthesis of a single polymer. When one monomer can yield more than one polymer, e.g. 1,3-butadiene or acrolein, some sort of structural notation must be used to identify the product, and one is not far from a formal structure-based name. 

Native dastin derivatives and thdr precursors undergo revasible, temperature-dependent, hydrophobic assembly from aqueous solution, which results in spontaneous phase separation of the polyp>eptide above a critical temperature, T that depends on polypeptide sequence and environmental conditions. This process, known as coacervation, is formally analogous to the responsive phase behavior observed for smart polymas such as poly(N-isopropylacrylamide) and poly( ethylene glycol) in aqueous solution above the lower critical solution temperature (LCST). Howeva, while similarities are observed between the two processes, the coacervation of native... 

Dibutylcarbitolformal. See Butylcarbitol formal Dibutyl-o-(o-carboxybenzoyl) glycolate Dibutyl-o-carboxybenzoyloxyacetate. See n-Butyl phthalyl-n-butyl glycolate Dibutyl Cellosolve Di-n-butyl Cellosolve. See Ethylene glycol dibutyl ether Dibutyl Cellosolve adipate. See Dibutoxyethyi adipate... 

Glycol formal. See 1,3-Dioxolane Glycol hydroxystearate CAS 33907-46-9 EINECS/ELINCS 251-732-4 Synonyms Ethylene glycol monohydroxystearate Glycol monohydroxystearate 2-Hydroxyethyl hydroxyoctadecanoate Hydroxyoctadecanoic acid, 2-hydroxyethyl ester Definition Ester of ethylene glycol and hydroxystearic acid Empirical C20H40O4... 

Ethoxyacetic acid Ethylene glycol acetate Glyceryl formal Methyl lactate Methyl-(S)-lactate C4H8O4 Erythrulose C4H8O4 Pd Palladium diacetate C4H8O4S Thiolanediol C4H8S... 

X CN where X = H or any other group where a formal dissociation may occur. For example, KCN or Ca(CN)2- Includes mono- and diethers or ethylene glycol, diettiylene glycol, and tiiethylene glycol R-(OCH2CH2)n-OR where... 

Morokuma and Sugeta used a modified Gaussian 82 and the MPROP program together with the code of their own to calculate dipole and rotatory strengths of ethylene glycol 23 using the MFP formalism. In their approach, the wavefunction position derivatives were obtained analytically and the wavefunc-tion field derivatives were obtained numerically. All the calculations were carried out at the HF/3-21G level. 

Ethylene Glycol Dimethyl Ether Methyl Formal Brucine... 

Pentaethylene glycol is prepared by condensation of 1.8-dichloro-3.6-dioxaoctane with 2 moles of ethylene glycol (60). In analogy to the synthesis described above, tEe cyclic formal is obtained. The H-NMR (in CDCI3) shows the following peaks S 4,73 ppm (2H) 3,76 (8H) 3,69 (12H). In IR no OH-groups or carbonyl bands are detectable but broad absorption in ether and acetal region is observed (61). 

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