Big Chemical Encyclopedia

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

Articles Figures Tables About

Dehydration of Carboxylic Acids

Dehydration of carboxylic acids 0-33 Reaction of acid derivatives with inorganic acids... [Pg.1278]

Carboxylic anhydrides. Ethoxyacetylene has seen limited use for dehydration of carboxylic acids because of its instability to heat and high volatility." This derivative (1) converts carboxylic acids, even ones that are inert to ethoxyacetylene, into anhydrides in 90-100% yield in CH .Cl2 at 25° to reflux temperatures. ... [Pg.221]

The soluble oligomeric carbodiimide is used as a coupling reagent for esterification, ami-dation and dehydration of carboxylic acids. [Pg.248]

Other carboxylic acid derivatives, for example ortho esters, ortho carbonates,or hy-drazono esters.are obtained via the corresponding acid chloride. Anhydrides are formed by dehydration of carboxylic acids with phosphorus peiitoxide. ... [Pg.583]

Dehydration of Carboxylic Acids with Thiols by Solid Supported Carbodiimide... [Pg.97]

The dehydration of carboxylic acid with thiols by the use of polymer supported ethyl (dimethylaminopropyl)carbodiimide (EDAC) 12 [18] was reported by Adamczyl and co-worker (Eq. 13) [19]. [Pg.97]

The intramolecular and intermolecular dehydration of carboxylic acids leads to the formation of ketenes and acid anhydrides, respectively. Methylketene is formed in a 65.5% yield by the dehydration of propionic acid over Bi203 Si02 at 973 K. Maleic anhydride is produced by the dehydration of maleic acid over alumina or metal phosphates at 503-513... [Pg.269]

Intermolecular dehydration of carboxylic acid may be accompanied by decarboxy-... [Pg.269]

Formation of Anhydrides. Dehydration of carboxylic acids with P2O5 is an effective method for the preparation of carboxylic anhydrides (eq 3). Acids have been converted to anhydrides with silica gel-supported P2O5, marketed as Sicapent by Merck. Similar results are obtained by heating a suspension of a carboxylic acid with a powdered mixture of P2O5, CUSO4, and Na2S04 in a primary alcohol. This gives the ester in 60-80% yields. ... [Pg.341]

See other pages where Dehydration of Carboxylic Acids is mentioned: [Pg.1656]    [Pg.146]    [Pg.632]    [Pg.321]    [Pg.243]    [Pg.284]    [Pg.731]    [Pg.1918]    [Pg.87]    [Pg.389]    [Pg.289]    [Pg.269]    [Pg.258]    [Pg.146]   
See also in sourсe #XX -- [ Pg.269 ]



SEARCH



Acids, dehydration

Carboxylic acids dehydration

Of dehydrated

© 2024 chempedia.info