Triacetic acid methyl ester

Triacetic acid methyl ester (2). This ester can be prepared easily by heating dehydroacetic acid (1) with magnesium methoxide. The reaction is slow when sodium or lithium methoxide is used. 

In another study where DDO was employed for tert-C-H hy-droxylation of several di- and triacetates of (5 8)-bile acid methyl esters, it was reported that derivatives bearing a 7-acetoxy group give 17a- or 14a-hydroxylated products in addition to the 5/8-hydroxylated ones. ... 

Turrea A la,3a,7a,llp,12a-pentahydroxy-28-oic acid methyl ester 1,7,12-triacetate Turrea floribunda 18) ... 

ABA ABS ABS-PC ABS-PVC ACM ACS AES AMMA AN APET APP ASA BR BS CA CAB CAP CN CP CPE CPET CPP CPVC CR CTA DAM DAP DMT ECTFE EEA EMA EMAA EMAC EMPP EnBA EP EPM ESI EVA(C) EVOH FEP HDI HDPE HIPS HMDI IPI LDPE LLDPE MBS Acrylonitrile-butadiene-acrylate Acrylonitrile-butadiene-styrene copolymer Acrylonitrile-butadiene-styrene-polycarbonate alloy Acrylonitrile-butadiene-styrene-poly(vinyl chloride) alloy Acrylic acid ester rubber Acrylonitrile-chlorinated pe-styrene Acrylonitrile-ethylene-propylene-styrene Acrylonitrile-methyl methacrylate Acrylonitrile Amorphous polyethylene terephthalate Atactic polypropylene Acrylic-styrene-acrylonitrile Butadiene rubber Butadiene styrene rubber Cellulose acetate Cellulose acetate-butyrate Cellulose acetate-propionate Cellulose nitrate Cellulose propionate Chlorinated polyethylene Crystalline polyethylene terephthalate Cast polypropylene Chlorinated polyvinyl chloride Chloroprene rubber Cellulose triacetate Diallyl maleate Diallyl phthalate Terephthalic acid, dimethyl ester Ethylene-chlorotrifluoroethylene copolymer Ethylene-ethyl acrylate Ethylene-methyl acrylate Ethylene methacrylic acid Ethylene-methyl acrylate copolymer Elastomer modified polypropylene Ethylene normal butyl acrylate Epoxy resin, also ethylene-propylene Ethylene-propylene rubber Ethylene-styrene copolymers Polyethylene-vinyl acetate Polyethylene-vinyl alcohol copolymers Fluorinated ethylene-propylene copolymers Hexamethylene diisocyanate High-density polyethylene High-impact polystyrene Diisocyanato dicyclohexylmethane Isophorone diisocyanate Low-density polyethylene Linear low-density polyethylene Methacrylate-butadiene-styrene... 

FIGURE 9 Chromatograms of enantiomeric resolution on cellulose triacetate CSPs. (a) /V-Benzoylalanine methyl ester, with hexane-ethanol (80 20, v/v) as the mobile phase, (b) Benzoin with hexane-2-propanol-water (70 27 3, v/v/v) as the mobile phase, (c) Mandelic acid with ethanol as the mobile phase. (From Ref. 9.)... 

Isomerization in hydrogen fluoride is effective for rearrangement of the readily obtainable triacetate of methyl rflc-4-epishikimate (148b). The methyl ester (149) of rcc-shikimic acid can be isolated ... 

With the elucidation of the elementary formula of cholic acid, a number of investigators began to contribute toward the nature of the functional groups. Hoppe-Seyler (16), for instance, showed that cholic acid was a mono-carboxylic acid which yielded a monomethyl or monoethyl ester, that the three remaining oxygen atoms were present as hydroxyl groups and that, under proper conditions, it was possible to obtain the triacetate of methyl cholate (17). The elucidation of the structure of the bile acids was carried out by Wieland and his co-workers, beginning in 1912 (18). 

This acid was isolated from cattle bile by Haslewood in 1946 (157) but has not been detected elsewhere. It may be synthesized by Oppenauer oxidation of cholic acid or from the methyl ester triacetate of cholic acid by selective hydrolysis and subsequent oxidation (158, 159). 

Under the classical conditions (pyridine, CHCI3, room temperature or 40-60 C), diethyl malonate did not react with aryllead triacetates and the a-methyl and a-phenyl derivatives reacted slowly to give poor yields (-25%) of the corresponding a-aryl a-substituted malonic acid diesters. Moderate to good yields were obtained by reacting the sodium salt of substituted malonic esters with aryllead triacetates in THF in the presence of pyridine, but the sodium salt of diethyl malonate again failed to react. 

Benzenedicarboxylic acid, bis [2-(1,1-dimethylethyl)-6-r[3-(1,1-dimethylethyl)-2-hydroxy-5-methylphenyll methyl]-4-methylphenyl] ester 67669-76-3 Dermol GL-7A Estalan-GLTR Glycereth-7 triacetate Hest G7A Pelemol G7A 67676-09-7 Isopulegyl acetate 57583-54-7 Fyrolflex RDP... 

Many cellulose derivatives form lyotropic liquid crystals in suitable solvents and several thermotropic cellulose derivatives have been reported (1-3) Cellulosic liquid crystalline systems reported prior to early 1982 have been tabulated (1). Since then, some new substituted cellulosic derivatives which form thermotropic cholesteric phases have been prepared (4), and much effort has been devoted to investigating the previously-reported systems. Anisotropic solutions of cellulose acetate and triacetate in tri-fluoroacetic acid have attracted the attention of several groups. Chiroptical properties (5,6), refractive index (7), phase boundaries (8), nuclear magnetic resonance spectra (9,10) and differential scanning calorimetry (11,12) have been reported for this system. However, trifluoroacetic acid causes degradation of cellulosic polymers this calls into question some of the physical measurements on these mesophases, because time is required for the mesophase solutions to achieve their equilibrium order. Mixtures of trifluoroacetic acid with chlorinated solvents have been employed to minimize this problem (13), and anisotropic solutions of cellulose acetate and triacetate in other solvents have been examined (14,15). The mesophase formed by (hydroxypropyl)cellulose (HPC) in water (16) is stable and easy to handle, and has thus attracted further attention (10,11,17-19), as has the thermotropic mesophase of HPC (20). Detailed studies of mesophase formation and chain rigidity for HPC in dimethyl acetamide (21) and for the benzoic acid ester of HPC in acetone and benzene (22) have been published. Anisotropic solutions of methylol cellulose in dimethyl sulfoxide (23) and of cellulose in dimethyl acetamide/ LiCl (24) were reported. Cellulose tricarbanilate in methyl ethyl ketone forms a liquid crystalline solution (25) with optical properties which are quite distinct from those of previously reported cholesteric cellulosic mesophases (26). 

Spectroscopic identification of members of the phragmalin group is fairly easy because of the presence of only three methyl groups, the characteristic singlets due to H-3 and H-30, and the orthoacetate carbon resonance at 8 119. The simplest member, phragmalin, (52) was found as an ester with nicotinic and acetic acids in E. caudatum (22), as a triacetate in Xylocarpus moluccensis (72) and as a series of esters in Chukrasia seed (62). 

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