通过可见光进行工程光氧化还原触发的化学转化已成为有机合成领域的新兴领域。但是,大多数成熟的光催化剂都是基于与贵金属和有机配体有关的过渡金属络合物或光敏有机染料,大大阻碍了可以提供更好的稳定性和耐久性的纯无机分子光催化剂的开发。在这里,我们发现安德森多金属氧酸盐(POM)Na 4 [NiMo 6 O 18(OH)6 ](1)由纯的无机骨架组成,该骨架由中心的Ni II核构建而成,并由六个Mo VI O 6支撑。无机支架/配体,可用作强大的光催化剂。在可见光(> 400 nm)照射下,该化合物可以高效催化多种反应,包括氯化物与胺的氧化交叉偶联反应,以及使用分子氧的氯化物氧化,从而提供多种亚胺,醛和酮,分别具有高选择性和高收率。由于具有强大的无机骨架,该催化剂在催化过程中表现出出色的稳定性和可重复使用性,而催化活性几乎没有损失,因此提供了一种无需使用复杂的有机配体和昂贵的贵金属基光敏剂的替代方案。
Vinyl ether compounds and polymerizable compositions
申请人:Daicel Chemical Industries, Ltd.
公开号:EP1972622A3
公开(公告)日:2009-07-01
Disclosed is an oxetane-containing vinyl ether compound including one or more aromatic or non-aromatic carbocycles and/or two or more vinyl ether structures, such as a compound of Formula:
wherein Ring Z1 is non-aromatic carbocycle; Ra is vinyl group of Formula:
wherein each of R1, R2, and R3 is hydrogen or C1-C4 alkyl; Wa is single bond or organic group having a valence of (m+1); X1 is, for example, hydrocarbon; "m" and "q" are each 1 or 2; and "p" is 0 to 5. Also disclosed is an alicyclic epoxy-containing vinyl ether compound of Formula:
wherein Ring Z2 is non-aromatic carbocycle; Rb is vinyl group of Formula:
wherein R4, R5 and R6 are each hydrogen or C1-C4 alkyl; Wb is single bond or organic group having a valence of (r+1); Rc and Rd are hydrogen or alkyl; and "r" and "s" are 1 or 2.
Mechanism of a Diels-Alder reaction. Butadiene and its dimers
作者:W. von E. Doering、M. Franck-Neumann、D. Hasselmann、R. L. Kaye
DOI:10.1021/ja00766a029
日期:1972.5
the trans,trans (or, less probably, the cis,cis) diradical to butadiene to be 81.1 5 2.0 kcal/mol, in good agreement with that (82.3 kcal/mol) deduced for the same reaction in the transformations of trans-divinylcyclobutane investigated by Hammond and DeBoer. In relation to the transition state for the Diels-Alderreaction of butadiene with itself to give Cvinylcyclohexene, the cleavage of the diradical
Photopolymerizable compositions that include alicyclic/aromatic dioxiranes and novel dioxiranyl tetraoxaspiro [5.5] undecanes
申请人:Curators of the University
公开号:US20030187093A1
公开(公告)日:2003-10-02
A visible light cationically photopolymerizable composition is provided. This composition includes an expanding monomer and a dioxirane. More specifically, the expanding monomer used in this composition is one or more dioxiranyl tetraoxaspiro[5.5]undecanes. The composition of the present invention may be used as a matrix resin for dental restorative materials. Another embodiment of the present invention is various novel dioxiranyl tetraoxaspiro [5.5]undecanes.
Novel compositions of matter which are useful as biodegradable detergents comprise alkali metal disubstituted cyclohexenyl sulfates. These compounds are prepared by condensing butadiene with allyl chloride, thereafter ring alkylating the resultant chloromethylcyclohexene with an olefin in the presence of a free-radical generating compound and reacting the disubstituted cyclohexene with an alkali metal salt of a sulfur-containing compound to form the desired product.
CATIONICALLY POLYMERIZABLE RESIN COMPOSITION AND CURED OBJECT OBTAINED THEREFROM
申请人:Funaki Yoshinori
公开号:US20120077946A1
公开(公告)日:2012-03-29
Disclosed is a cationically polymerizable resin composition which includes an oxetane-ring-containing vinyl ether compound (A) and/or an alicyclic-epoxy-containing vinyl ether compound (B); and an oligomer or polymer (C) having a molecular weight of 500 or more, being liquid at 0° C., and containing at least one of structures represented by following Formulae (1a) to (1f), wherein R
x
represents hydrogen atom or methyl group; R
1
to R
3
each independently represent a hydrocarbon group having 1 to 5 carbon atoms; “a” is an integer of from 0 to 5; and “b” is 1 or 2. This cationically polymerizable resin composition has a low viscosity, is easy to work, cures extremely rapidly upon irradiation with light, and can give a cured object excellent in flexibility, thermal stability, and bendability after heat treatment.