2.4.6- Trimethyl-phenyl acetic acid

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>... 

In the Mukaiyama aldol additions of trimethyl-(l-phenyl-propenyloxy)-silane to give benzaldehyde and cinnamaldehyde catalyzed by 7 mol% supported scandium catalyst, a 1 1 mixture of diastereomers was obtained. Again, the dendritic catalyst could be recycled easily without any loss in performance. The scandium cross-linked dendritic material appeared to be an efficient catalyst for the Diels-Alder reaction between methyl vinyl ketone and cyclopentadiene. The Diels-Alder adduct was formed in dichloromethane at 0°C in 79% yield with an endo/exo ratio of 85 15. The material was also used as a Friedel-Crafts acylation catalyst (contain-ing7mol% scandium) for the formation of / -methoxyacetophenone (in a 73% yield) from anisole, acetic acid anhydride, and lithium perchlorate at 50°C in nitromethane. 

The reaction of ate complexes (24), formed from trialkylboranes and trimethyl-silylpropargyl phenyl ether, with a mixture of acetic acid and hexamethylphosphoric triamide (HMPT) gives trimethylsilylacetylenes (25) selectively (Eq. 54) whereas the corresponding trimethylsilylallenes (26) are selectively prepared by the reaction with sodium methoxide instead of acetic acid and HMPT (Eq. 54) In the latter, when primary alkylboranes are used, the corresponding allene derivatives are obtain in high purity, but secondary alkylboranes give reverse ratios of the isomer distribution. 

Buten-2-one, 3-methyl-4-phenyl-. See 3-Methyl-4-phenyl-3-buten-2-one 3-Buten-2-one, 3-methyl-4-(2,6,6-trimethyl-2-cyclohexen-1-yl)-. See a-lsomethylionone 3-Buten-2-one, 4-(2,4,6,6-tetramethyl-2-cyclohexen-1-yl)-. Seea-lrone (2-Butenylidene) acetic acid. See Sorbic acid Butesin. See Butyl PABA Buteth-2 carboxylic acid CAS 75427-76-8 107600-34-0 Synonyms Acetic acid, [2-[2-butoxyethoxy] ethoxy]- [2-[2-Butoxyethoxy] ethoxy] acetic acid PEG-2 butyl ether carboxylic acid PEG 100 butyl ether carboxylic acid POE (2) butyl ether carboxylic acid Classification Organic acid Empirical C10H20O5... 

Thus,as shown in Equation 8.17,the oxidation of the diarylenol,2-(2, 4, 6 -trimethyl-phenyl)-2-phenyl-l-ethenol with lead tetracetate in warm ethanoic acid (acetic acid, CH3CO2H) yields the corresponding acetoxyaldehyde. 

Obtained by degradation of 5,7-dimethyl-3-(4-methyl-phenyl)-2-phenylbenzo-furan in boiling acetic acid, followed by saponification of the keto ester so obtained (2-benzoyloxy-3,4, 5-trimethyl-benzophenone) [44],... 

Alkyl phenyl ketonesAlkylation of the anion of 1 followed by oxidation and rearrangement gives a mixed acetal, which is hydrolyzed by acid to a ketone (cf. Phenylthiomethyl(trimethyl)silane, this volume). 

The />-nitrobenzylmethoxy group and the l-[(trimethylsilyl)ethoxy]ethyl group have been introduced for hydroxyl protection, especially 2 -OH in solid-phase oligoribonucleoside synthesis. The low yields achieved in the preparation of the diastereomeric pyruvic acid acetals 14 from the corresponding 3,4-di-O-trimethyl-silyl ether 12 by use of the established procedure prompted the authors to devise an alternative route to 14 via the acetoxyacetonide 13, as shown in Scheme 1. The pyruvic acid acetal imidate 15 was obtained in 4 steps from 5-phenyl 4 ,6 -0-benzylidene-l-thiolactoside for use in the synthesis of pyruvated trisaccharides. New examples of the concomitant acetal formation and introduction of a carbamoyl function on treatment of cw-/ranj-configured 1,2,3-triols with chloral/ DCC (e.g., 16 17, see Vol. 28, p. 97, Refs. 16-18) have been reported. 

Benzyl trimethyl ammonium hydroxide Cetrimonium bromide Dimethyl diallyl ammonium chloride Laurtrimonium bromide Laurtrimonium chloride Methyl tributyl ammonium chloride Tetrabutyl ammonium bromide Tetrabutyl ammonium chloride Tetrabutyl ammonium fluoride Tetra-n-butyl ammonium hydrogen sulfate Tetra-n-butyl ammonium hydroxide Tetrabutyl ammonium iodide Tetrabutylphosphonium acetate, monoacetic acid Tetrabutylphosphonium bromide Tetrabutylphosphonium chloride Tetraethylammonium bromide Tetraethylammonium hydroxide Tetrakis (hydroxymethyl) phosphonium chloride Tetramethylammonium bromide Tetramethylammonium chloride Tetramethylammonium hydroxide Tetramethyl ammonium iodide Tetraphenyl phosphonium bromide Tetrapropyl ammonium bromide Tetrapropyl ammonium iodide Tributylamine Tributyl phosphine Tributyl (tetradecyl) phosphonium chloride Trioctyl (octadecyl) phosphonium iodide catalyst, phase-transfer Tetraethylammonium chloride Tetraoctylphosphonium bromide Tri-n-butyl methyl ammonium chloride Tri methyl phenyl ammonium hydroxide catalyst, phenolics Triethylamine... 

Phenyl salicylate Polyvinyl acetate Polyvinyl butyral Shellac Sucrose octaacetate 1,1,2,2-Tetrachloroethane Trimethyl-1,3-pentanediol, 2,2,4-diisobutyrate Triphenyl phosphate Vinyl acetate Zinc stearate lacquers, fixing radio-tube cathode Diethyl oxalate lacquers, metals Aluminum oleate lacquers, nonyellowing Sunflower acid lacquers, slow-drying Ethoxydiglycol acetate lacquers, spirit Solvent yellow 33 lacquers, stoving drum linings Phenolic-epoxy resin lactate mfg. 

With a-methylstyrene (6, R = Ph), the yield of the diacetylation with acetic anhydride and perchloric or sulfoacetic acid affording 2,6-dimethyl-4-phenylpyrylium salts is lowered because of polymerization side products. Whereas the resulting phenyl group in position 4 (7) is deactivated towards electrophilic acylation, no such effect is exerted on a p-phenyl group, so that allylbenzene with acetic anhydride and perchloric acid affords a mixture of 2,6-dimethyl-3-phenvlpyrylium and 2,6-dimethyl-3-(para-acetyl-phenyl)-pyrylium perchlorates/ However, starting from a tertiary alcohol (17), 2,4,6-trimethyl-3-phenylpyrylium perchlorate (18) can be obtained without para-acetylation. ... 

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