Big Chemical Encyclopedia

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

Articles Figures Tables About

Arenecarboxylic acid carbon monoxide

The condensation of aromatic compounds with tellurium tetrachloride produces aryl tellurium trichlorides that can be converted to diaryl ditelluriums, which, in turn, can be reduced to arenetellurols. These tellurols condense with alkyl halides to give aryl alkyl telluriums. When these aryl alkyl telluriums are carbonylated with carbon monoxide in the presence of palladium(II) chloride or acetate, arenecarboxylic acids are formed1-4... [Pg.487]

Treatment of diaryl tellurium dichlorides, obtainable from tellurium tetrachloride and aromatic compounds, with carbon monoxide in the presence of palladium(II) chloride/lithium chloride gives arenecarboxylic acids. Biaryls are formed as by-products1,2. Similar products were obtained when the diaryl tellurium dichlorides were reacted with nickel tetracarbonyl3. [Pg.584]

Some of the latest developments in terms of substrates for the Heck reactions are nitrophenyl benzoates [55], acyl benzoates (mixed anhydrides) [236], and substituted benzoic acids [53]. For the last two, the leaving groups are carbon dioxide and carbon monoxide, respectively. A variety of alkenes have been coupled with these substrates. While esters and anhydrides presumably react in a catalytic cycle like that of the classical Heck reaction [237], arenecarboxylic acids, when treated with an equimolar amount of a silver salt as reoxidant, appear to undergo a nonclassical Heck reaction as demonstrated by the coupling with 2-cyclohexenone to give a 3-arylcyclohexenone. [Pg.555]


See other pages where Arenecarboxylic acid carbon monoxide is mentioned: [Pg.2069]    [Pg.2248]    [Pg.2069]    [Pg.2248]    [Pg.1146]    [Pg.2358]    [Pg.2069]    [Pg.2248]    [Pg.2069]    [Pg.2248]    [Pg.1146]    [Pg.2358]    [Pg.487]    [Pg.2249]    [Pg.2249]    [Pg.265]   
See also in sourсe #XX -- [ Pg.1682 , Pg.1685 , Pg.1686 , Pg.1687 ]




SEARCH



Arenecarboxylate

Arenecarboxylic acids

Carbon, acids monoxide

© 2024 chempedia.info