- Economical synthetic method 1, 2 - dimethyl -1, 4, 5, 6 - tetrahydropyrimidine (by machine translation)
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1, 2 - Dimethyl -1, 4, 5, 6 - tetrahydropyrimidine synthesis methods greatly shorten the reaction time N - methylenediamine and acetonitrile by adding thioacetamide or hydrogen sulfide as catalyst, obtain high yield in a short reaction time, and greatly improve the economical. (by machine translation)
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Paragraph 0036-0045
(2019/09/14)
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- Synthesis method of 1,2-dimethyl-1,4,5,6-tetrahydropyrimidine
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The invention discloses a synthesis method of 1,2-dimethyl-1,4,5,6-tetrahydropyrimidine. A novel route is chosen, reactions are efficiently and quickly carried out under the assistance of microwaves,and the product yield is high. The synthesis method has the advantages of simple reaction route, easy operation, short reaction time, and high yield.
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Paragraph 0025; 0028; 0031; 0032; 0037; 0042; 0047-0057
(2018/11/27)
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- Cyclic and linear amidine catalysts for the efficient synthesis of cyclic trithiocarbonates from carbon disulfide and episulfides under mild conditions
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Cyclic and linear amidines effectively catalyzed the reaction of carbon disulfide and episulfides under mild conditions, such as ordinary pressure and ambient temperature, to give the corresponding cyclic trithiocarbonates in high yields.
- Aoyagi, Naoto,Endo, Takeshi
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p. 1702 - 1704
(2018/04/10)
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- Push-pull alkenes by reacting N,N′-dimethyl cyclic ketene N,N′-acetals with isocyanates: synthesis, structures, and reactivities
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N,N′-Dimethyl cyclic ketene N,N′-acetals react with two or three equivalents of isocyanates to generate tetrasubstituted push-pull alkene derivatives in one-pot sequential reactions. X-ray crystallography showed significant elongations and out of plane distorsions of the polarized carbon-carbon double bonds.
- Ye, Guozhong,Henry, William P.,Chen, Chunlong,Zhou, Aihua,Pittman Jr., Charles U.
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supporting information; experimental part
p. 2135 - 2139
(2009/07/26)
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- Non-nanogold catalyzed aerobic oxidation of secondary amines to imines
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Bulk gold powder (~103 nm particle size) is a highly active catalyst for the oxidative dehydrogenation of secondary amines to imines under the mild conditions of 1 atm O2 and 60-100°C. The Royal Society of Chemistry.
- Zhu, Bolin,Angelici, Robert J.
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p. 2157 - 2159
(2008/02/08)
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- Process for the preparation of 4-nitrodiphenylamines
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The invention relates to a process for the preparation of 4-nitrodiphenylamines by the reaction of halogenonitrobenzenes with primary aromatic amines in the presence of copper or a copper compound, a neutralizing agent and a cyclic diaza compound.
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