Methyl acetate structure

Structure of luciferin (Ohtsuka et al., 1976). The luciferin of Diplocardia longa is a colorless liquid, and fairly stable at room temperature. It is soluble in polar organic solvents (methanol, ethanol, acetone, and methyl acetate) but insoluble in nonpolar solvents like hexane and carbon tetrachloride. Based on the chemical properties and spectroscopic data, the following chemical structure was assigned to the luciferin. 

X-ray structure analyses of Rh(COCH3)(I)2(dppp) (14) and [Rh(I I)(I)(//-I)(dppp)]2 (15), where dppp l,3-bis(diphenylphosphino) propane, were reported. Unsaturated complex (14) possesses a distorted five-coordinate geometry that is intermediate between sbp and tbp structures.69 Under CO pressure, the rhodium/ionic-iodide system catalyzes either the reductive carbonylation of methyl formate into acetaldehyde or its homologation into methyl acetate. By using labeled methyl formate (H13C02CH3) it was shown that the carbonyl group of acetaldehyde or methyl acetate does not result from that of methyl formate.70... 

The sex ph eromone of the obscure mealybug. Pseudococcus viburni Signoret (Homoptera Coccidae), consists of (li , 2i , 35 )-(2,3,4,4-tetramethylcyclopentyl)methyl acetate. This compound is interesting because it is the first example of a new monoterpenoid structural motif in which the two isoprene units forming the carbon skeleton are joined... 

A drop in efficiency with increasing degree of crosslinking of the resin was also observed [366], this effect being much greater with the larger molecules of ethyl hexanoate than with methyl acetate. The results are considered by Hammett et al. to be consistent with their hypothesis the structure of the more highly crosslinked resin imposes more severe restraints in the formation of the transition state than does the structure of the less crosslinked resin. 

Gorak A, Hoffmann A. Catalytic distillation in structured packings methyl acetate synthesis. AIChE J 2001 47 1067-1076. 

Chemical Name Pregn-4-en-20-one, 17-hydroxy-6a-methyl-, acetate Common Name Anagestone acetate Anapregnone Structural Formula ... 

This type of reaction has been used by Spath69 and Tschitschibabin60 for the synthesis of a-substituted ethers. Since the fully methylated aldoses have a cyclic acetal structure, Bonner and Craig91 attempted to extend Reaction (6) to the carbohydrate series. 

P. A. J. Gorin, M. Mazurek, H. S. Duarte, M. Iacomini, and J. H. Duarte, Properties of 13C-N.M.R. spectra of O-(l-carboxyethylidene) derivatives of methyl /j-D-galactopyranoside Models for determination of pyruvic acid acetal structures in polysaccharides, Carbohydr. Res., 100 (1982) 1-15. 

Countercurrent flow has advantages in reactions that are limited by product inhibition and equilibrium limitations. Structured catalytic packings (Figure 4, right) are commonly used under conditions of countercurrent flow in catalytic distillation. They have been applied for esterification (to form methyl acetate, ethyl acetate, and butyl acetate), acetalization, etherification (to form methyl tertiary-butyl ether), and ester hydrolysis (to form methyl acetate) have been implemented on an industrial scale. 

At its simplest. NMR makes it po iUe to count the number of different carbon attune in a molecule of unknown structure. Look at the KM It spectra of methyl acetate and 1-pciitanol shown previously in Figures 13.3b and 13.6b, for instance. In each case, a glc sharp resonance line is observed for each dUTerent carbon atom. 

The preceding three antiviral agents tend to differ form each other by only relatively small structural details. The next protease inhibitor includes some significant structural differences though it shares a similar central aminoalcohol sequence that is presumably responsible for its activity. Construction of one end of the molecule begins with protection of the carbonyl function in p-bromobenzaldehyde (27) as its methyl acetal (28) by treatment with methanol in the presence of acid. Reaction of that intermediate with the Grignard reagent from 4-bromopyridine leads to unusual... 

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