本文报道了新型氢键结合体1(3).CA的形成,该反应是通过将氰尿酸(CA)与三聚氰胺衍生物1混合而获得的,其中三个可能的H键阵列中的两个已被封闭。四个成分通过9个氢键结合在一起,形成一个刚性平面结构,其中一个中央CA(三个ADA图案:A =受体,D =供体)被氢键合到三个外围的三聚氰胺衍生物(DAD图案)上。此外,描述了氢键结合的组装体2-4.CA和CA的合成和组装研究,该组装体由三种共价连接的三聚氰胺衍生物组成。组件2-4.CA的整体热力学稳定性优于1(3).CA(I(Tm)= 9 vs 3.6)。通过(1)1 H NMR光谱法和MALDI-TOF质谱法确认了在氯仿中2.CA络合物的存在。用手性或荧光基团(R(3))替代三聚氰胺使得能够通过CD和荧光光谱研究组件。滴定实验表明,即使在极性溶剂(例如THF和CH(3)OH)存在下,稳定性也大大增强。根据溶剂的极性,观察到平面组装单元之间的堆叠。
Hindered amines based on various 2,2,6,6-tetraalkylated nitrogen-containing heterocyclic moieties wherein the hindered nitrogen atom on the ring is substituted with OR.sub.1 substituents and the 4-position of the ring is substituted with a variety of groups, are effective as light stabilizers in diverse substrate systems.
α-Substituted benzylamino-s-triazines were synthesized, and their phytotoxic activity and phytotoxic symptom against paddy weeds and transplanted rice seedlings were evaluated. Some of these compounds exhibited potent phytotoxicity against the weeds, high selectivity between the rice and the weeds, and had different phytotoxic properties to atrazine and simetryn. Among these compounds, 2-chloro-4-ethylamino-6-α-methylbenzylamino-s-triazine (2), 2-chloro-4-ethylamino6-α-ethylbenzylamino-s-triazine (3), 2-chloro-4-diethylamino-6-α-methylbenzylamino-s-triazine (17), and 2-chloro-4-diisopropylamino-6-α-methylbenzylamino-s-triazine (19) were found to have high phytotoxic activity and selectivity. The phytotoxic symptom of these compounds was mainly growth inhibition to the weeds. Two of these, the diethylamino (17) and diisopropylamino (19) compounds, showed growth inhibition activity without burning the leaf of rice plants at high doses.
Controlling the distance between hydrogen-bonded chloro-s-triazine tapes: crystal engineering using N-alkyl chains and the influence of temperature
作者:Vina R. Aldilla、Mohan Bhadbhade、Saroj Bhattacharyya、Naresh Kumar、Anne M. Rich、Christopher E. Marjo
DOI:10.1039/c7ce01049d
日期:——
packing. Despite this variation, there is still a strong correlation of alkylchain length with the inter-tape spacing in a single direction in the crystal. This correlation is strongest at ambient temperature where the longer chains are highly disordered and extended. We observe an “odd-number carbon” effect where bis-N-propyl 1b and bis-N-pentyl 1d derivatives undergo a structuralphase transition with
CYANOETHYLMELAMINE DERIVATIVES AND PROCESS FOR PRODUCING THE SAME
申请人:NISSAN CHEMICAL INDUSTRIES, LIMITED
公开号:EP0945446A1
公开(公告)日:1999-09-29
The present invention relates to a cyanoethylmelamine derivatives of the formula I:
wherein 1 to 5 of the substituents X' to X6 represent a cyanoethyl group and at least one remaining group represents a C1-20 alkyl group, a C2-20 alkenyl group (said alkyl or alkenyl group may optionally have an alicyclic group or a phenyl group in its structure), a C5-6 cycloalkyl group or a phenyl group, or two of the substituent groups bonded to the same nitrogen atom together may form an alkylene chain having 2 to 7 carbon atoms, and the remaining substituent or substituents represents a hydrogen atom}. The production of cyanoethylmelamine derivatives can be obtained at high yield by reacting N-substituted melamine derivatives with acrylonitrile or reacting mono- or di-halogeno-N-substituted triazine derivative with aminopropionitrile. The compounds of the formula (I) are useful compounds as intermediates for fine chemicals such as agricultural chemicals, medicines, dye stuffs, paints, etc. and as crosslinking intermediates for resins.
Selenacalix[3]triazines: Anion Versus Proton Association
作者:Wim Van Rossom、Joice Thomas、Tatyana G. Terentyeva、Wouter Maes、Wim Dehaen
DOI:10.1002/ejoc.201201548
日期:2013.4
preorganization of three electrondeficient triazine rings allows for anions to bind through anion-π interactions, and alignment of the central nitrogen lone pairs and the well-defined size of the macroring enable association with a single proton. Extended UV/Vis titration studies indicated a clear difference in complexation behavior depending on the outer-rim substitutionpattern. The host–guest properties
Selenacalix[3]triazines 是一种在杂芳基成分之间具有直接 Se 键的环三聚元环芳烃,被证明与各种客体物种相关联。三个缺电子三嗪环的预组织允许阴离子通过阴离子-π 相互作用结合,并且中心氮孤对的排列和大环的明确定义的大小能够与单个质子结合。扩展的 UV/Vis 滴定研究表明,根据外缘替代模式,络合行为存在明显差异。发现类似的硒和硫杯[3]三嗪的主客体特性明显不同。