Propionic acid, 2,2-Dimethyl

Chloro 2.2 dimethyl propionic acid dimethazone 7 Chloro 3.8 dimethyl quinoline quinmerac... 

A wide variety of A2B monomers, such as 2,2-dimethyl propionic acid, 3,5-diacetoxybenzoic acid, 3,5-6is(trimethylsiloxy)benzoyl chloride, 3,5-dihydroxy-benzoic acid, and 5-acetoxyisophthalic acid have been used for the synthesis of hyperbranched polymers. A majority of the polymers are synthesized via step-wise polymerizations where A B monomers are bulk-polymerized in the presence of a suitable catalyst, typically an acid or a transesterification agent. To achieve satisfactory conversion, the low-molecular-weighf condensation product (e.g. H2O, CH3OH) formed during the reaction has to be removed. This is most often accomplished by passing an inert gas or by reducing the pressure in the reaction vessel. A drawback of polycondensation polymers is that they are prone to depolymerization by hydrolysis, which might restrict their use. 

Dimethyl propionic acid vinyl ester. See Vinyl pivalate... 

CAS 3377-92-2 EINECS/ELINCS 222-175-4 Synonyms 2,2-Dimethyl propionic acid vinyl ester Classification Nonaromatic ester vinyl ester monomer [MhUm Vinyl ester of neopentanoic acid Empkkal ... 

C7H14O2 2,2-dimethyl-propionic acid ethyl ester 3938-95-2 ... 

Pivalic Acid. 2,2-Dimethylpropanoic acid a, a-dimethyl propionic acid trimethyl acetic acid. CjH,0O, mol wt 102.13. C 58.80%, H 9,87%, O 31.33%. Prepd by the reaction of (ert-butylmagnesium chloride and carbon dioxide Bouveault, Compt. Rend. 138, 1108 (1904) Puntambeker, Zoellner, Org. Syn. 8, 104 (1928) other methods ibid. 108. Forms higher esters (e.g., isobutyl ester) only with difficulty. 

This ester (70 g) and diethyl carbonate (250 mg) were stirred at 90°C to 100°C while a solution of sodium ethoxide [from sodium (7.8 g) and ethanol (1 54 ml)] was added over 1 hr. During addition, ethanol was allowed to distill and after addition distillation was continued until the column heat temperature reached 124°C. After cooling the solution to 90°C, dimethyl sulfate (33 ml) was followed by a further 85 ml of diethyl carbonate. This solution was stirred and refluxed for 1 hr and then, when Ice cool, was diluted with water and acetic acid (10 ml). The malonate was isolated in ether and fractionally distilled to yield a fraction boiling at 148°C to 153°C/0.075 mm, identified as the alpha-methyl malonate. This was hydrolyzed by refluxing for 1 hr at 2.5N sodium hydroxide (350 ml) and alcohol (175 ml), excess alcohol was distilled and the residual suspension of sodium salt was acidified with hydrochloric acid to give a precipitate of the alpha-methyl malonic acid. This was decarboxylated by heating at 180°C to 200°Cfor 30 minutes and recrystallized from petroleum ether (BP 80°C to 100°C) to give 2-(2-fluoro-4-biphenylyl)propionic acid, MP 110°C to 111°C. 

To the mixture of 85.5 g ethyl a-(3chloro-4.aminophenyl)-propionate hydrochloride, 142 g sodium carbonate and 600 ml dimethyl formamide, 107 g 1,4room temperature. The mixture is filtered, the filtrate evaporated in vacuo, the residue is triturated with hexane, the mixture filtered, the residue washed with petroleum ether and the filtrate evaporated. The residue is combined with 280 ml 25% aqueous sodium hydroxide and the mixture refluxed for 8 hours. After cooling, it is diluted with water, washed with diethyl ether, the pH adjusted to 5 to 5.2 with hydrochloric acid and extracted with diethyl ether. The extract is dried, filtered, evaporated and the residue crystallized from benzene-hexane, to yield the a-(3-chloro-4-pyrrolinophenyl)-propionic acid melting at 94°C to 96°C. 

Dimethyl ester-diol polyesterifications, 84 Dimethyl formamide (DMF), 79, 295 Dimethyl isophthalate (DMI), 106 Dimethylol propionic acid (DMPA), 238 Dimethyl sulfoxide (DMSO), 83, 185,... 

ETHYLENE GLYCOL ETHYL MERCAPTAN DIMETHYL SULPHIDE ETHYL AMINE DIMETHYL AMIDE MONOETHANOLAMINE ETHYLENEDIAMINE ACRYLONITRILE PROPADIENE METHYL ACETYLENE ACROLEIN ACRYLIC ACID VINYL FORMATE ALLYL CHLORIDE 1 2 3-TRICHLOROPROPANE PROPIONITRILE CYCLOPROPANE PROPYLENE 1 2-DICHLOROPROPANE ACETONE ALLYL ALCOHOL PROPIONALDEHYDE PROPYLENE OXIDE VINYL METHYL ETHER PROPIONIC ACID ETHYL FORMATE METHYL ACETATE PROPYL CHLORIDE ISOPROPYL CHLORIDE PROPANE... 

The reaction of potassium 3-amino-4-oxo-3,4-dihydroquinazoline-2-thiolate 62 with a-bromophenylacetic acid 63 resulted in the formation of (3-amino-4-oxo-3,4-dihydroquinazolin-2-ylsulfanyl)-phenyl-acetic acid methyl ester 64 which on alkali treatment and subsequent acidification resulted in the synthesis of 2-phenyl- 1-thia-4,4a,9-triaza-anthracene-3,10-dione 65 <1999JCR(S)86>. Similarly, the reaction of potassium 3-amino-5,6-dimethyl-4-oxo-3,4,4a,7a-tetrahydrothieno[2,3- pyrimidine-2-thiolate 66 with a-bromo-ester 67 resulted in the formation of 2-(3-amino-5,6-dimethyl-4-oxo-3,4,4a,7a-tetrahydrothieno[2,3- / pyrimidin-2-ylsulfanyl)-propionic acid ethyl ester 68. Subsequent treatment with alkali followed by acidification resulted in the formation of 2,3,7-trimethyl-3a,9a-dihydro-l,8-dithia-4a,5,9-triazacyclopenta[ ]naphthalene-4,6-dione 69 <2000JHC1161>... 

BODIPY FL C3-SE is 4,4-difluoro-5,7-dimethyl-4-bora-3a,4a-diaza-s-indacene-3-propionic acid, succinimidyl ester (Invitrogen). The derivatization to the base BODIPY molecule... 

Propargyl alcohol, 36, 67 Propiolaldehyde, 36, 66 Propionic acid, /3,/3 -thiodi-, dimethyl ester, 30, 65... 

Propanol with magnesium in reduction of chlorobenzene, 47, 104 Propionic acid, 2-(2,4,5,7-tetranitro-flcoken-9-ylideneamtnooxv)-, (+)- AND (-)-, 48, 120 Propionyl fluoride, 45, 6 Propiophenone, condensation with paraformaldehyde, 48, 91 -Propylaminc, 45, 85 -Propylhydrazine, 45, 85 C-( -Propyl)-N-phenylnitrone, generation from phenylhydroxylamine and -butyraIdehyde, 46, 97 Purification of tetrahydrofuran (Warning), 46,105 477- Pyran-4-0ne, 2-6-dimethyl-3,5-DIPHENYL-, 47, 54... 

Annex III lays down the conditions of use for permitted preservatives and antioxidants, with lists of foods and maximum levels in each case. Part A lists the sorbates, benzoates and p-hydroxybenzoates, E 200-E 219 part B lists sulphur dioxide and the sulphites, E 220-E 228 part C lists other preservatives with their uses, including nisin, dimethyl dicarbonate and substances allowed for surface treatment of certain fruits, E 249 potassium nitrite, E 250 sodium nitrite, E 251 sodium nitrate and E 252 potassium nitrate, E 280-E 283 propionic acid and the propionates part D lists the antioxidants E 320 butylated hydroxyanisole (BHA), E 321 butylated hydroxytoluene (BHT), E 310 propyl gallate, E 311 octyl gallate, E 312 dodecyl gallate, E 315 eiythorbic acid and E 316 sodium erythorbate. 

Potassium cyanide, 84 Potassium ethyl xanthate, 56 Potassium hydroxide, 103 Potassium iodide, 34 Potassium permanganate, 87 Propionic acid, j3,/3 -THiODi-, dimethyl ESTER, 65... 

Synthesis of racemic naproxene Friedel-Crafts acylation (aluminum chloride - nitrobenzene) of p-naphthol methyl ether affords 2-acetyl-6-methoxy naphthalene, which, when treated with either dimethyl sulfonium or dimethylsulfoxonium methylide, gives 2-(6-methoxynaphthalen-2-yl)propylene oxide. Treatment of the latter with boron trifluoride etherate in tetrahydrofuran gives 2-(6-methoxynaphthalen-2-yl)propionaldehyde, which is oxidized using Jones reagent (4 M chromic acid) to yield the racemic 2-(6-methoxynaphthalen-2-yl)propionic acid. 

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