Butyric acids, aryl

PMMA is not affected by most inorganic solutions, mineral oils, animal oils, low concentrations of alcohols paraffins, olefins, amines, alkyl monohahdes and ahphatic hydrocarbons and higher esters, ie, >10 carbon atoms. However, PMMA is attacked by lower esters, eg, ethyl acetate, isopropyl acetate aromatic hydrocarbons, eg, benzene, toluene, xylene phenols, eg, cresol, carboHc acid aryl hahdes, eg, chlorobenzene, bromobenzene ahphatic acids, eg, butyric acid, acetic acid alkyl polyhaHdes, eg, ethylene dichloride, methylene chloride high concentrations of alcohols, eg, methanol, ethanol 2-propanol and high concentrations of alkahes and oxidizing agents. 

Related to these cements are the long chain aliphatic acids and aryl-substituted butyric acid (Skinner, Molnar Suarez, 1964). These materials are on the market as non-eugenol cementing agents but they are unduly... 

The 3,4-dihydrodiol of BcP was synthesized from 4-oxo-l,2,3,4-tetrahydro-BcP (15) by Method I (66). The ketone L was itself prepared from 4-oxo-l,2,3,4-tetrahydrophenanthrene via a multistep sequence entailing Reformatsky reaction with methyl bromocrotonate, dehydration of the resulting alcohol, isomerization to the aryl-butyric acid, and cyclization of its acid chloride with SnCl - Full... 

The examples of intramolecular acylation by the use of aluminum chloride in the Friedel-Crafts reaction occur in the literature so frequently that no attempt has been made here to enumerate all of them. Table VII includes several different types of arylpropionic and aryl-butyric acids which have been cyclized by this method. 

Rhodium complex 27 has also been successfully applied in the enantio-selective conjugate addition of arylboronic acids [59]. In the synthesis of the 4-amino-3-aryl-butyric acid derivative 28, Helmchen et al. found that the addition product was obtained in > 99% ee (59% yield) within 2 h at 65 °C, whereas previous attempts with (S)-BINAP and [Rh(acac)(C2H4)2]... 

The possibility of alkyl or aryl group migration in competition with the loss of carbon dioxide was investigated in the photolysis of a-azido-iso-butyric acid (21) and azidodiphenylacedc acid (23). In the first case acetone (22) was the only product, and no trace of acetaldehyde could be found methyl-migration had not taken place. Evi-... 

Similar high yields are obtained in the cycloacylation of aryl butyric acids in toluene at 180°C and in the presence of bismuth(Ill) bistriflimide (1% mol). A great variety of tetralones, and chroman- and thiochroman-... 

Cui, D.-M., Kawamura, M., Shimada, S., Hayashi, T., and Tanaka, M. 2003. Synthesis of 1-tetralones by intramolecular Priedel-Crafts reaction of 4-aryl-butyric acids using Lewis acid catalysts. Tetrahedron Lett. 44 4007-4010. 

Refluxing 4-(5-aryl-2-oxo-4-pyrrolinyl-3-idene)butyric acids with acetic anhydride gave the corresponding pyrrolo-3,4-dihydro-2-oxepinones, while similarly substituted crotonic acids gave pyr-rolo-2-oxepinones <87AKZ189>. 

Although azide reagents have been utilized in a number of chemical transformations, to date PS-TsA has only been utilized for the direct transfer of a diazo function to methylene groups flanked by either two carbonyls (eq 2), a carbonyl and an aryl sulfonyl (eq 3), or the methylene of lO/ anthracen-9-one. Diazodicarbonyl compounds such as 5-diazo-2,2-dimethyl-[l,3]dioxane-4,6-dione, 2-diazo-3-oxo-butyric acid ethyl ester, lO-diazo-lO/ anthracen-9-one, 2-diazo malonic acid diethyl ester, and 2-diazo-3-oxo-butyric acid ter/-butyl ester, as well as... 

The mechanism of the stereoselective syntheses of (K)-3-aryl-5-(hydroxy-methyl)oxazolidinones via the Mannenin reaction of aryl carbamic acid esters with (Jt)-glycidyl butyrate has been explored in detail by Brickner et al. [60]. Namely, N-lithiated carbamate derivatives of anilines are allowed to react with the commercially available (K)-glycidyl butyrate (96-98% enantiomeric excess ee) under appropriate conditions to obtain enantiomerically pure (Jt)-3-aryl-5-(hydroxymethyl)oxazolidinones in 85-99% yields, according the pathways depicted in Scheme 19. 

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