Dimethyl citrate

For the condensation with the properly derivatized lysine part (112) 3 -terf-butyl-1,5-di-Af-hydroxysuccinimidyl citrate (113) was used (Chart 10). It was prepared from 1,5-dimethyl citrate by reaction with ferf-butyl acetate, alkaline hydrolysis of the methyl ester and coupling with W-hydroxysuccinimide by DCCI (257). 

Cupilure or (S j-TT-dimethyl citrate was identified as the contact sex pheromone of the female spider, Cupiennius salei. Chemical analysis, electrophysiology and behavioral assay demonstrated that it was indeed the contact sex pheromone." ... 

The extracts contained almost pure pheromone, with only minor amounts of other components. By comparison with synthetic samples, derivatization, and gas chromatography on a chiral cyclodextrin phase, the pheromone was identified as a 95 5 mixture of (5)- and (/ )-enantiomers of dimethyl citrate (cupilure (3), Fig. 4.2). Only the (5)-enantiomer was active (Tichy et al., 2001). Cupilure is probably present in ionized form on the silk (pK 3.5), because solvent extracts were neutral. The ionized carboxyl group may be conjugated to basic amino acids of the silk proteins. This would also explain why the pheromone is not volatile, despite its relatively low molecular weight, and is easily washed from the silk by water, including rain. In the tropical habitat of C. salei this would ensure the presence of cupilure only on freshly laid silk. 

Hirota K, Kitagawa H, Shimamura M, Ohmori S (1980) A facile preparation of asym-monomethyl, sym-monomethyl and asym-dimethyl citrate. Chem Lett 9 191-194... 

Diethyl aniline, 54 Diethylcarbaniazine citrate, 54 Diethyl carbamyl chloride, 54 Diethyl chlorophosphate, 54 Diethylene triamine, 54 Diethyl ether, 54 Di(2-ethylhexyl) phthalate, 54 Diethyl ketone, 54 Diethyl-p-phenylenediamine, 54 Diethyl phthalate, 54 Diethylstilbestrol, 55 Diethyl sulfate, 55 Diethyl zinc, 55 Difluoromethane chloride, 55 Digitoxin, 55 Diglycidyl ether, 55 Digoxin, 55 Diisobutyl ketone, 55 Diisopropylamine, 55 Diisopropyl ether, 55 DIKAMIN , 2,4-D, 55 DIKONIRT , 2,4-D, 55 Dimefox, 55 Dimethoate, 55 3,3 -Dimethoxybenzidine, 55 n,n-Dimethylacetamide, 56 Dimethylamine, 56 4-Dimethylaminoazobenzene, 56 Dimethylaminoethanol, 56 n,n-Dimethyl aniline, 56 7,12-Dimethylbenz[a]anthracene, 56 3,3 -Dimethylbenzidine, 56... 

Chemical Name N,N-dimethyl-2-[(2-methylphenyl)phenylmethoxy] ethanamine citrate Common Name —... 

Fig. 4 Absorption spectra of the green type GFP chromophore as a function of pH. (a) Absorption spectra of model compound FIBDI (4-hydroxybenzy lidene-1,2-dimethyl-imidazolinone) in aqueous solution cationic (- 1 M HC1), neutral acetate buffer, pH 5.5), and anionic 1 M NaOFI). Reproduced with permission from [71]. (b) Absorption spectra of AvGFP as a function of pH pH 5.46 (a), pH 8.08 (b), pH 10.22 (c), pH 11.07 (d), pH 11.55 (e), pH 13.0 (f), pH 1.0 (g). For curves (a-e) the buffer contained 0.01 M each sodium citrate, sodium phosphate and glycine. Sample f was in 0.1 M NaOH, and sample g was in 0.1 M HC1. Reproduced with permission from [6],...

Figure 3.13. Titration of the fluorescence of anthrylpolyamine 6 by various added anions, o, phosphate ion , sulfate ion O, acetate ion Q, dimethyl phosphate ion , citrate ion +, TBAC1 ion.

Ascorbic acid Osmium (4,4 -dimethyl-2,2 - Citrate-capped gold [207]... 

Note Rankings-based calculated CVs from reported mean intensity, standard deviation 1 = lowest percent CV (least variation). SSC = saline sodium citrate. DMSO = Dimethyl sulfoxide. 

A model system demonstrating the nutritional destruction of lysine in bovine plasma albumin (BPA) by reaction with either a dialdehyde (MA) or a keto-aldehyde (MGA) was studied in relation to reaction rates as affected by pH, temperature, reaction time and carbonyl concentration. The BPA was Fraction V obtained from Schwartz/Mann and had a molecular weight of 69 x 103 with sixty lysine residules/mole, an assayed content of 11.4%. It was dissolved in 0.0200 M phosphate-citrate buffer adjusted to the desired pH. Malonaldehyde was prepared by acid hydrolysis of its bis-(dimethyl acetal). An aqueous solution of pyruvic aldehyde was diluted with distilled water and phosphate-citrate buffer to give an MGA solution of the desired pH (16). 

Chemical Name Ethanamine, 2-(4-(4-chloro-l,2-diphenyl-l-butenyl)phenoxy)-N,N-dimethyl-, (Z)-, citrate salt (1 1)... 

L-pyrenyldiazomethane to form stable, highly fluorescent L-pyienylmethyl monoesters (87). These esters have been analyzed in human blood by ce combined withlif detection. To miminize solute adsorption to the capillary wall, they were coated with polyacrylamide, and hydroxypropyl methylcellulose and dimethyl form amide were used as buffer additives to achieve rehable separations. Separation was performed in tris-citrate buffer, pH 6.4, under reversed polarity conditions. The assay was linear for semm MMA concentrations in the range of 0.1—200 Jlmol/L. 

Calcium Lignosulfonate beta-Cyclodextrin Dimethyl Dicarbonate Glyceryl Palmitostearate 4-Hexylresorcinol Magnesium Phosphate, Dibasic, Mixed Hydrates Manganese Citrate Olestra... 

A simpler and more versatile route to comparably functionalized bicyclooctanes has been developed more recently by Weiss and his co-workers.174-176 Specifically, the reaction of 1,2-dicarbonyl compounds with dimethyl 3-ketoglutarate (dimethyl acetonedicarboxylate) in aqueous solution at pH 5, or preferably in a citrate-phosphate buffer, followed by hydrolytic decarboxylation, affords 117 in good... 

SYNS trans-l-(p-P-DIMETHYL. tMIKOETHOXYPHEN-YL)-1,2-DIPHENA LBUT-1-ENE CITRATE ICI 46,474 KESSAR NOLTAM NOLVADEX TAMOFEN TAMOXASTA TAMOXIFEN CITRATE TERIiMON ZYNOPLEX... 

YL, CITRATE KETONE see BEL525 BENZYLDIMETHYLAMMONIUM HEXAFLUOROARSENATE see BEL550 BENZYL DIMETHYL CARBINOL see DQQ200 BENZYL DIMETHYLCARBINYL BUTYRATE see BEL850... 

DIETHYLAMINOETHYL-2-PHENYL-3-METHYLVALERATE METHYL BROMIDE see VBKOOO 5-P-DIETHYLAMINOETHYL-3-PHENYL-l,2,4-OXADIAZOLE CITRATE see OOEOOO 10-(2-DIETHYLAMINO-2-METHYLETHYL)PHENOTHIAZINE see DIROOO 2-DIETHYLAMINO-6-METHYLPYRIMIDIN-4-YL DIMETHYL PHOSPHOROTHIONATE see DIN800... 

Amylose triacetate prepared from butanol-precipitated starch may be plasticized with almost any of the common plasticizers which are applicable to the plasticization of cellulose triacetate. For example, some suitable plasticizers are dimethyl or diethyl tartrate, tributyl citrate, tributyl phosphate, tricresyl phosphate, polyethylene glycol, and pentaerythritol tetraacetate. Addition of only 10-20% plasticizer is sufficient to give amylose triacetate films a useful and lasting degree of... 

Ethylcellulose is compatible with the following plasticizers dibutyl phthalate diethyl phthalate dibutyl sebacate triethyl citrate tributyl citrate acetylated monoglyceride acetyl tributyl citrate triacetin dimethyl phthalate benzyl benzoate butyl and glycol esters of fatty acids refined mineral oils oleic acid stearic acid ethyl alcohol stearyl alcohol castor oil corn oil and camphor. 

Fig. 1 Use of polymer-coated silica stationary phase with a neat carbon dioxide mobile phase. Column Deltabond SFC Methyl (150 X 2.0 mm) mobile phase CO2 pressure gradient 75 bar initial for 2 min, then 50 bar/min ramp to 180 bar, then 15 bar/min ramp to 300 bar flow 0.5 mL/min temperature 100°C injection 5 jjlL detection flame ionization detector sample solvent methylene chloride. Peak key 1 BHT 2 dimethyl azelate 3 triethyl citrate 4 tributyl phosphate 5 methyl palmitate 6 methyl stearate 7 diethylhexyl phthalate 8 Tinuvin 327 9 Spectra-Sorb UV531 10 tri(2- ethylhexyl) trimellitate 11 dilauryl thiodipropionate ...

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