Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Fl-keto esters

Reduction of a-alkoxy-fl-keto esters.1 r-Butoxy esters of a-alkoxy-/3-keto acids are reduced by NaBH4 in 2-propanol selectively to erythro-a-alkoxy-fl-hydmxy curboxylates. The report suggests that the selectivity results from reduction of an intermediate five-membcred chelate involving Na+ and, in fact, no stereoselectivity is observed if a crown ether is present. [Pg.357]

Pimetic Acid. This acid is manufactured by Tateyama Chemical Company in Japan in quantities of about 100(1-200(1 kg/yr. and by Heinrich Mock Nachf in Germany. The method or process they are using lias not been disclosed. Pimelic acid is available in small quantities with purities of 98% from laboratory chemical supply companies. The preparation of pimelic acid has been described in Organic Syntheses cyclohexanone condenses with diethyl oxalate, followed by decarboxylation in ethyl 2-keto-hcxahydmhcnzoatc, and then eleavage of the fl-keto ester with strong alkali. [Pg.490]

Oxidation of cyclic fl-keto esters. These substrates were oxidized by KF and 02 in DMSO to a-hydroxy-j8-keto esters in fair yields, which can be improved by addition of triethyl phosphite and 18-crown-6. ... [Pg.222]

Polyhydroxy- phenols. amino acids, di- and polyamino compounds, amino alcohols. Sulphonic acids. Sulphinic acids. Salts. sulphinic acids, aminosulphonic acids and sulphonamides. Some diketones and fl-keto esters. Ethers and acetals. Lactones. Acyl halides. Diaryl ethers. intermediate reduction products of nitro compounds. Sulphones, sulphonamides of secondary amines, sulphides, sulphates and other sulphur compounds. [Pg.1202]

Asymmetric alkylation of fl-keto esters. The a-carbomcthoxycyclopentanone, when protected as the acetal 2 with (lS,2S)-cyclohexanadiol, undergoes highly stereoselective alkylation (equation I). [Pg.91]

We pointed out on p. 643 that the Claisen reaction generates 1,3-dicarbonyl compounds. The examples here are a subset of such compounds they are all fl-keto esters ... [Pg.647]

Claisen condensation Reaction in which a fl-keto ester is formed by condensation of two moles of an ester in base ... [Pg.1157]

Scheme 5.31 Enantioselective decarboxylative allylic alkylation of fl-keto esters 99,... Scheme 5.31 Enantioselective decarboxylative allylic alkylation of fl-keto esters 99,...
See other pages where Fl-keto esters is mentioned: [Pg.385]    [Pg.895]    [Pg.1106]    [Pg.1109]    [Pg.1110]    [Pg.1111]    [Pg.1112]    [Pg.1115]    [Pg.1120]    [Pg.1121]    [Pg.1126]    [Pg.1128]    [Pg.1129]    [Pg.1132]    [Pg.1136]    [Pg.1140]    [Pg.1142]    [Pg.1144]    [Pg.1148]    [Pg.1154]    [Pg.1156]    [Pg.1162]    [Pg.317]    [Pg.1267]    [Pg.154]    [Pg.499]    [Pg.407]    [Pg.227]    [Pg.117]    [Pg.472]    [Pg.444]   
See also in sourсe #XX -- [ Pg.97 , Pg.98 ]



SEARCH



3-Keto esters

FL 1060

© 2024 chempedia.info