cobaloxime to produce olefins and H2. This operationally simple method enables direct dehydrogenation of readily available chemical feedstocks to diversely functionalized olefins. For example, we demonstrate, for the first time, the oxidant-free desaturation of thioethers and amides to alkenyl sulfides and enamides, respectively. Moreover, the system’s exceptional siteselectivity and functional group
脂肪族催化脱氢 (CDA) 在有机合成中的价值在很大程度上仍未得到充分探索。已知的均相 CDA 系统通常需要使用牺牲氢受体(或氧化剂)、贵金属催化剂和苛刻的反应条件,因此将大多数现有方法限制为非或低官能化烷烃的脱氢。在这里,我们描述了一种可见光驱动的双催化剂系统,该系统由廉价的有机光氧化还原和贱金属催化剂组成,用于室温、无受体 CDA (Al-CDA)。该过程由光激发的 2-氯蒽醌引发,涉及脂肪族的 H 原子转移 (HAT) 形成烷基自由基,然后与钴肟反应生成烯烃和 H 2. 这种操作简单的方法能够将容易获得的化学原料直接脱氢成多种官能化的烯烃。例如,我们首次证明了硫醚和酰胺在无氧化剂条件下分别脱饱和为烯基硫醚和烯酰胺。此外,14 种生物相关分子和药物成分的后期脱氢和合成说明了该系统卓越的位点选择性和官能团耐受性。机理研究揭示了双重 HAT 过程,并提供了对反应性和位点选择性起源的见解。
Novel fluorescent carbazole derivative
申请人:——
公开号:US20030023099A1
公开(公告)日:2003-01-30
The object of this invention is to provide an illuminant, which can easily be produced at low cost. This invention is a carbazole derivative luminescent compound having a carbazole ring skeleton, to the nitrogen atom of which is attached an electron-donating group, and to the carbon atom of which is attached an electron-attracting group at the third position to the nitrogen atom.
Benzidine derivative and electrophotosensitive material using the same
申请人:Mita Industrial Co. Ltd.
公开号:US05550290A1
公开(公告)日:1996-08-27
The present invention relates to a benzidine derivative represented by the general formula (1): ##STR1## wherein R.sup.1 to R.sup.6, m and n are as defined in the present specification. The benzidine derivative improves durability and heat resistance of a membrane containing the same while maintaining high hole transferring capability. Therefore, an electrophotosensitive material, which comprises a photosensitive layer containing the benzidine derivative, has high sensitivity and is superior in durability and heat resistance.
The object of this invention is to provide an illuminant, which can easily be produced at low cost. This invention is a carbazole derivative luminescent compound having a carbazole ring skeleton, to the nitrogen atom of which is attached an electron-donating group, and to the carbon atom of which is attached an electron-attracting group at the third position to the nitrogen atom.
Tryptanthrine derivative and electrophotosensitive material
申请人:MITA INDUSTRIAL CO. LTD.
公开号:EP0708375A1
公开(公告)日:1996-04-24
According to the present invention, there is provided a novel tryptanthrine derivative represented by the formula:
wherein R1a, R1b, R1c, R1d, R2a, R2b, R2c, and R2d are the same or different and indicate a hydrogen atom, an alkyl group or a halogenated alkyl group; provided that R1a, R1b, R1c and R1d do not indicate a hydrogen atom, simultaneously. Tryptanthrine and a derivative thereof are suitably used for an electrophotosensitive material because of their excellent electron transferring capability.