尽管水是一种广泛使用、无毒且安全的溶剂,但由于许多催化剂、反应物和产物不溶于水,水在有机合成中的应用仍然是一个持续的挑战。在这项研究中,报道了一种三苯胺改性的氰基亚苯基亚乙烯基衍生物(TPCI),它具有优异的水溶性以及在水中产生单线态氧(1 O 2)的显着选择性和效率,使其非常适合用作光催化反应的高效光敏剂氢化氮杂苯、烯烃和氢硅烷的合成,得到偶氮芳香族化合物、羰基化合物和硅烷醇的功能有机分子,在蓝光照射下具有良好的官能团耐受性和广泛的底物范围。本研究介绍了一种新型II型光敏剂,该光敏剂能够利用可见光在水中高效地进行光催化氧化来合成功能性有机分子。
direct oxidation of hydrazine HN–NH bonds to azo group functionality catalyzed by molecular iodine is disclosed. The strengths of this reactivity include rapid reaction times, low catalyst loadings, use of ambient dioxygen as a stoichiometric oxidant, and ease of experimental set-up and azo product isolation. Mechanistic studies and density functional theory computations offering insight into this reactivity
Base-Catalyzed Hydrophosphination of Azobenzenes with Diarylphosphine Oxides: A Precise Construction of N-N-P Unit
作者:Gang Hong、Xiaoyan Zhu、Chen Hu、Alfred Njasotapher Aruma、Shengying Wu、Limin Wang
DOI:10.1021/acs.joc.6b01210
日期:2016.8.5
Addition of diarylphosphine oxides to the N═N double bond of azobenzenes leads to the formation of the P-substituted hydrazines in up to 98% yield for 24 examples, and the formation of diphenylphosphinic amides was observed in three substrates. This strategy features tolerance of a wide range of functional groups, simple operation, and mild reaction conditions. Specially, this method can be also applied
A number of chloro-, methyl- and methoxy-substituted azobenzenes have been reduced to the corresponding hydrazines by using an aqueous solution of Na2S2O4. The yield is generally excellent, but two compounds, viz. 4,4-dimethoxyazobenzene and 2,2,4,4,6,6-hexamethylazobenzene, gave no hydrazine at all.
Reformed polysilazane and method of producing same
申请人:TOA NENRYO KOGYO KABUSHIKI KAISHA
公开号:EP0304239A1
公开(公告)日:1989-02-22
A novel, reformed polysilazane obtained by reacting a polysilazane with a compound selected from ammonia, primary and secondary amines, hydrazine and mono-, di- and tri-substituted hydrazines to cross-link the polysilazane with the compound serving as a cross-linking agent or to link the compound to the polysilazane.