The invention relates to compounds with a nitrogen-containing heterocyclic nucleus, of the general formula: ##STR1## in which: Ar represents a group ##STR2## or a naphthyl group optionally substituted by a halogen, A represents a heterocyclic nucleus chosen from the group consisting of the ...
Aziridines are three-membered organic heterocyclic compounds with one nitrogen atom. The bond angles in aziridine are approximately 60°, which is less than the normal hydrocarbon bond angle of 109.5°. Because of the increased s-character of the nitrogen free electron pair, aziridine is less basi...
Several charts and tables on the import and export market for heterocyclic compounds with only nitrogen hetero-atom(s), having an unfused pyridine ring in Ecuador in 2009 are presented depicting the variations in share percentage, total value in U.S. dollars, and rank of countries from which ...
A nitrogen-containing heterocyclic compound of the formula: <CHEM> wherein R1 is either one of the following groups: <CHEM> (in which R7, R8, R9, R10, R11, R12, R13, R14, R15, R16 and R17 are each independently a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C1-C4, ...
The Chemistry of Heterocyclic Compounds, Part 1, Volume 15, Heterocyclic Systems with Bridgehead Nitrogen Atoms No abstract is available for this article. Mosby,L W. 被引量: 3发表: 2009年 The Chemistry of Heterocyclic Compounds. Volume 15. Heterocyclic Systems with Bridgehead Nitrogen Atoms. Part...
This chapter deals with gas chromatography separation and mass spectra of nitrogen-containing heterocyclic compounds. It gives a detailed description of mass spectra of pyridines, quinolines, and acridines. The M + peak is usually intense except when long-chain alkyl groups are attached to the ring...
The Chemistry of Heterocyclic Compounds, Part 1, Volume 15, Heterocyclic Systems with Bridgehead Nitrogen Atoms 078240, PUJARI H K ET AL: " Heterocyclic systems containing bridgehead nitrogen atoms. Part LXVIII. Reaction of 5-fluorobenzimidazole-2-thione with chloroacetic acid: studies of orientation ...
Nitrogen-containing heterocyclic compounds 专利名称：Nitrogen-containing heterocyclic compounds 发明人：Henrick, Clive Arthur 申请号：EP86810302.9 申请日：19860709 公开号：EP0218543B1 公开日：19910828 专利内容由知识产权出版社提供 摘要：The invention relates to novel compounds of formula (A) wherein the...
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Sulfonated rice husk ash (RHA-SO3H) as a highly efficient and reusable catalyst for the synthesis of some bis-heterocyclic compounds Sulfonated rice husk ash (RHA-SO3H), a newly reported solid acid catalyst, was efficiently used for the synthesis of 4,4′-(arylmethylene)-bis-(3-methyl-1-....