The umpolung of substituent effect in nucleophilic aromatic substitution. A new approach to the synthesis of N,N-disubstituted melamines (triazine triskelions) under mild reaction conditions
作者:Beata Kolesinska、Zbigniew J. Kaminski
DOI:10.1016/j.tet.2009.03.017
日期:2009.5
By the umpolung of substituent effect 1,3,5-triazines substituted with three dialkylamino groups were prepared under mild reaction conditions by treatment of cyanuric chloride with tertiary amines. Quaternary N-triazinylammonium salts were identified as reactive intermediates activating the triazine ring and strongly promoting the persubstitution of all chlorine atoms. The final degradation of intermediate
Synthesis, Spectra, and Theoretical Investigations of 1,3,5-Triazines Compounds as Ultraviolet Rays Absorber Based on Time-Dependent Density Functional Calculations and three-Dimensional Quantitative Structure-Property Relationship
作者:Xueding Wang、Yilian Xu、Lu Yang、Xiang Lu、Hao Zou、Weiqing Yang、Yuanyuan Zhang、Zicheng Li、Menglin Ma
DOI:10.1007/s10895-018-2235-2
日期:2018.3
A series of 1,3,5-triazines were synthesized and their UV absorption properties were tested. The computational chemistry methods were used to construct quantitative structure-property relationship (QSPR), which was used to computer aided design of new 1,3,5-triazines ultraviolet rays absorber compounds. The experimental UV absorption data are in good agreement with those predicted data using the Time-dependent
Reactions of Bis(silyl-substituted) Methyllithium with α-Hydrogen-free Nitriles into 1,3,5-Triazines
作者:Xia Chen、Sheng-Di Bai、Li Wang、Dian-Sheng Liu
DOI:10.3987/com-05-10357
日期:——
Bis(silyl-substituted) methyllithium has been found to catalyze a conversion of α-hydrogen-free nitriles directly to yield 2,4,6-trisubsituted s-triazines. The generally high yields and relatively mild reaction conditionsof this procedure suggest an alternative to other aromatic nitrile cyclotrimerization reactions. Silicotropic rearrangements from C to N or N to N and an unusual elimination of LiCR
已发现双(甲硅烷基取代)甲基锂可催化 α-无氢腈直接转化为 2,4,6-三取代 s-三嗪。该程序的一般高产率和相对温和的反应条件表明可以替代其他芳族腈环三聚反应。观察到从 C 到 N 或 N 到 N 的硅变重排和 LiCR 2 R' 的异常消除(R=SiMe 3 ,R'=SiMe 2 NMe 2 )。
4,6-Bis- and 2,4,6-tris-(N,N-dialkylamino)-s-triazines: synthesis, NMR spectra and restricted rotations
作者:Alan R. Katritzky、Daniela C. Oniciu、Ion Ghiviriga、Richard A. Barcock
DOI:10.1039/p29950000785
日期:——
Syntheses of various symmetrically and non-symmetrically trisubstitutedtriazines are reported. Dynamic NMR (1H and 13C) experiments demonstrate that 2,4,6-tris(dialkylamino)-s-triazines show correlated rotations of the alkyl groups in the dialkylamino moieties. Unsymmetrical 2-chloro-, 2-alkoxy- and 2-aryloxy-4,6-bis(di-n-alkylamino)-s-triazines display two non-equivalent n-alkyl groups, due to the
Reaction of Disubstituted Cyanamides with Formamides under High Pressure
作者:Isao Shibuya、Akihiro Oishi、Masahiko Yasumoto
DOI:10.3987/com-98-8191
日期:——
High pressure-assisted co-cyclization of disubstituted cyanamides with formamide or monosubstituted formamides gave 2-amino- or 2-monosubstituted amino-4,6-bis(disubstituted amino)-1,3,5-triazines in one pot.