Big Chemical Encyclopedia

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

Articles Figures Tables About

Pyrolysis allyl esters

Methylsuccinic acid has been prepared by the pyrolysis of tartaric acid from 1,2-dibromopropane or allyl halides by the action of potassium cyanide followed by hydrolysis by reduction of itaconic, citraconic, and mesaconic acids by hydrolysis of ketovalerolactonecarboxylic acid by decarboxylation of 1,1,2-propane tricarboxylic acid by oxidation of /3-methylcyclo-hexanone by fusion of gamboge with alkali by hydrog. nation and condensation of sodium lactate over nickel oxide from acetoacetic ester by successive alkylation with a methyl halide and a monohaloacetic ester by hydrolysis of oi-methyl-o -oxalosuccinic ester or a-methyl-a -acetosuccinic ester by action of hot, concentrated potassium hydroxide upon methyl-succinaldehyde dioxime from the ammonium salt of a-methyl-butyric acid by oxidation with. hydrogen peroxide from /9-methyllevulinic acid by oxidation with dilute nitric acid or hypobromite from /J-methyladipic acid and from the decomposition products of glyceric acid and pyruvic acid. The method described above is a modification of that of Higginbotham and Lapworth. ... [Pg.56]

Among phosphonate esters (170) used in olefin synthesis were those with R = S-CeHi-Br-/ , S02 C6H4-Br-A CO-NHR, and S CHa CEi-XHa. The allyl vinyl thio-ethers (171) obtained using the last of these gave a-allyl-aldehydes on pyrolysis in the presence of red mercuric oxide. [Pg.180]

One synthetic route to the damascones starts with an appropriate cyclogeranic acid derivative (halide, ester, etc.). This is reacted with an allyl magnesium halide to give 2,6,6-trimethylcyclohexenyl diallyl carbinol, which on pyrolysis yields the desired l-(2,6,6-trimethylcyclohexenyl)-3-buten-l-one. Damascone is obtained by rearrangement of the double bond in the side-chain [98]. [Pg.67]

The results are shown in Table 23. Relative rate data were obtained by simultaneous pyrolysis of pairs of ethers. Since the total rate spread of all ethers from the slowest (ethyl allyl) to the fastest (diphenylmethyl-1-methyl allyl) was only a factor of 40, it is apparent that substituent effects are relatively very small (see ester and vinyl ether eliminations). Polarization in the transition states must, therefore, be minimal. Cookson and Wallis ° noted the following rate trends ... [Pg.427]

Pyrolysis of phenylaminocarbonyl esters of j3-hydroxysilanes (prepared from ketones and Me3SiCH2MgBr) leads to mixtures of allyl- and vinyl-silanes, and may be of some preparative significance. Compound (94) is converted into other types of vinylsilanes (95) by successive treatment with Bu"Li and an electrophile such as Bu"Br, CO2,... [Pg.373]


See other pages where Pyrolysis allyl esters is mentioned: [Pg.498]    [Pg.205]    [Pg.284]    [Pg.917]    [Pg.674]    [Pg.674]    [Pg.338]    [Pg.319]    [Pg.917]    [Pg.222]    [Pg.917]    [Pg.248]    [Pg.240]    [Pg.201]    [Pg.256]    [Pg.276]    [Pg.186]    [Pg.2548]    [Pg.407]    [Pg.410]    [Pg.76]    [Pg.210]    [Pg.11]    [Pg.318]    [Pg.15]    [Pg.128]   
See also in sourсe #XX -- [ Pg.498 ]

See also in sourсe #XX -- [ Pg.498 ]

See also in sourсe #XX -- [ Pg.98 , Pg.498 ]




SEARCH



Allyl pyrolysis

Allylation esters

Esters allyl

Esters allylic

© 2024 chempedia.info