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Formation of Hybrid Ring Structure of Cyanurate/Isocyanurate in the Reaction be-tween 2,4,6-Tris(4-Phenyl-Phenoxy)-1, 3,5-Triazine and Phenyl Glycidyl Ether
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作者 Daisuke Ohno Kazuya Zenyoji +2 位作者 Youji Kurihara Kazuyoshi Ueda Hitoshi Habuka 《International Journal of Organic Chemistry》 CAS 2016年第2期117-125,共9页
Reaction products of 2,4,6-tris(4-phenyl-phenoxy)-1,3,5-triazine derived from 4-phenylphenol cyanate ester and phenyl glycidyl ether were analyzed. In addition to an isocyanurate compound and an oxazolidone compound w... Reaction products of 2,4,6-tris(4-phenyl-phenoxy)-1,3,5-triazine derived from 4-phenylphenol cyanate ester and phenyl glycidyl ether were analyzed. In addition to an isocyanurate compound and an oxazolidone compound which were well known as reaction products of cyanate esters and epoxy resins, compounds with hybrid ring structure of cyanurate/isocyanurate were determined. Gibbs free energies of the compound having hybrid ring structure of cyanurate/isocyanurate with two isocyanurate moiety were found to be lower than that of the compound with cyanurate ring structure through calculations. Calculation data supported the existence of hybrid ring structure of cy-anurate/isocyanurate. It was revealed that isomerization from cyanurate to isocyanurate occurs via hybrid ring structure of cyanurate/isocyanurate in the reaction of aryl cyanurate and epoxy. 展开更多
关键词 Reaction products of 2 4 6-tris(4-phenyl-phenoxy)-1 3 5-triazine derived from 4-phenylphenol cya-nate ester and phenyl glycidyl ether were analyzed. In addition to an isocyanurate compound and an oxazolidone compound which were well known as reaction products of cyanate esters and epoxy resins compounds with hybrid ring structure of cyanurate/isocyanurate were determined. Gibbs free energies of the compound having hybrid ring structure of cyanurate/isocyanurate with two isocyanurate moiety were found to be lower than that of the compound with cyanurate ring struc-ture through calculations. Calculation data supported the existence of hybrid ring structure of cy-anurate/isocyanurate. It was revealed that isomerization from cyanurate to isocyanurate occurs via hybrid ring structure of cyanurate/isocyanurate in the reaction of aryl cyanurate and epoxy.
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P(NMe_(2))_(3)介导1,2-二羰基化合物与α,β-不饱和酮的[1+4]环化反应及多取代2,3-二氢呋喃的合成
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作者 薛飞雪 曾建伟 +2 位作者 严泰山 韩杰 贺峥杰 《有机化学》 SCIE CAS CSCD 北大核心 2022年第11期3805-3815,共11页
在P(NMe_(2))_(3)作用下,1,2-二羰基化合物与α,β-不饱和酮顺利发生分子间[1+4]环化反应,生成带有全碳季碳中心的多取代2,3-二氢呋喃类化合物,从而以较高的收率及较宽的底物范围提供了合成该类化合物的新方法.在某些情况下,[1+2]环化... 在P(NMe_(2))_(3)作用下,1,2-二羰基化合物与α,β-不饱和酮顺利发生分子间[1+4]环化反应,生成带有全碳季碳中心的多取代2,3-二氢呋喃类化合物,从而以较高的收率及较宽的底物范围提供了合成该类化合物的新方法.在某些情况下,[1+2]环化反应竞争发生生成多取代的环丙烷化合物.借助密度泛函理论(DFT)计算手段,讨论了反应机理及有关[1+2]环化反应与[1+4]环化反应的化学选择性. 展开更多
关键词 [1+4]环化反应 1 2-二羰基化合物 [1+2]环化反应 2 3-二氢呋喃 Kukhtin-Remirez加合物
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连三嗪化合物的合成及反应机理 被引量:3
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作者 李亚南 常海波 +5 位作者 王伯周 王友兵 杨威 廉鹏 李辉 张志忠 《含能材料》 EI CAS CSCD 北大核心 2013年第1期19-24,共6页
以2-氰基-4-硝基苯胺、3-氨基-4-氰基吡唑为原料,分别经肟化、重氮化等反应合成了两种连三嗪化合物——6-硝基苯并[3,4-e]-1,2,3-三嗪-4(1H)-肟和吡唑并[3,4-e]-1,2,3-三嗪-4(1H)-肟;利用红外光谱、核磁共振(HMNR、CMNR)、元素分析、质... 以2-氰基-4-硝基苯胺、3-氨基-4-氰基吡唑为原料,分别经肟化、重氮化等反应合成了两种连三嗪化合物——6-硝基苯并[3,4-e]-1,2,3-三嗪-4(1H)-肟和吡唑并[3,4-e]-1,2,3-三嗪-4(1H)-肟;利用红外光谱、核磁共振(HMNR、CMNR)、元素分析、质谱等鉴定了化合物的结构;考察不同因素对肟化反应的影响,确定了2-偕氨肟基-4-硝基苯胺的最适宜合成条件:2-氰基-4-硝基苯胺/盐酸羟胺的料比为11.20,反应温度为80℃,pH值为10,反应时间为2 h,收率为95.6%;3-氨基-4-偕氨肟基吡唑的最适宜合成条件:3-氨基-4-氰基吡唑/盐酸羟胺的料比为11.25,反应温度为80℃,pH值为10,反应时间为2 h,收率为79.3%;初步探讨了反应机理,分析了重氮化、消除反应发生在不同分子结构中不同位置氨基上的原因。 展开更多
关键词 有机化学 连三嗪化合物 合成 表征 反应机理
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