Radicals derived from N-(alpha-xanthyl)acetanilides or N-(alpha-xanthyl)acetylaminopyridines possessing a substituent next to the nitrogen undergo a hitherto undocumented Smiles rearrangement proceeding through a four-membered ring. It was also found that under certain conditions the amidyl radical produced by cleavage of the four-membered ring intermediate can undergo fragmentation to give an isocyanate. Such fragmentations are unprecedented at temperatures corresponding to refluxing benzene or chlorobenzene.
Verfahren zur Herstellung von Carbonsäuren und N-tert. Alkylaminen
申请人:BAYER AG
公开号:EP0068219A1
公开(公告)日:1983-01-05
Carbonsäuren und N-t-Alkylamine können gleichzeitig durch alkalische Druckhydrolyse von N-t-Alkylcarbonsäureamiden hergestellt werden. Man setzt hierzu eine 5- bis 50gewichtsprozentige wäßrige Alkalihydroxidlösung in einer Menge von 1,0 bis 1,3 Mol pro Mol des Amids ein. Das Verfahren wird bei 200 bis 350 °C durchgeführt.
One-pot synthesis of N-tert-butyl amides from alcohols, ethers and esters using ZnCl2/SiO2 as a recyclable heterogeneous catalyst
作者:Fatemeh Tamaddon、Fatemeh Tavakoli
DOI:10.1016/j.molcata.2011.01.013
日期:2011.3
ZnCl2/SiO2 has been found to be an efficient and reusable catalyst for conversion of alcohols, ethers and esters to corresponding amides via the Ritter reaction in high yield. It was found that benzonitrile reacted with tert-butyl acetate faster than the other sources of tert-butyl carbocation. (C) 2011 Elsevier B.V. All rights reserved.
US4496736A
申请人:——
公开号:US4496736A
公开(公告)日:1985-01-29
Process for the preparation of carboxylic acids and N-tert.-alkylamines
申请人:Bayer Aktiengesellschaft
公开号:US04496736A1
公开(公告)日:1985-01-29
Carboxylic acids and N-t.-alkylamines can be prepared simultaneously by the alkaline pressure hydrolysis of N-t.-alkyl carboxylic acid amides. A 5 to 50% strength by weight aqueous solution of an alkali metal hydroxide is employed for this purpose in an amount of 1.0 to 1.3 mols per mol of the amide. The process is carried out at 200.degree. to 350.degree. C.
Radicals derived from N-(alpha-xanthyl)acetanilides or N-(alpha-xanthyl)acetylaminopyridines possessing a substituent next to the nitrogen undergo a hitherto undocumented Smiles rearrangement proceeding through a four-membered ring. It was also found that under certain conditions the amidyl radical produced by cleavage of the four-membered ring intermediate can undergo fragmentation to give an isocyanate. Such fragmentations are unprecedented at temperatures corresponding to refluxing benzene or chlorobenzene.