Organometallic Dendrimers Based on (Tetraphenylcyclobutadiene)cyclopentadienylcobalt Modules
摘要:
The synthesis and characterization of novel organometallic polyphenylene dendrimers containing 24 or 44 phenyl rings and one cyclobutadiene(cyclopentadienyl)cobalt unit is reported. The dendrimers are made by the convergent CPCO(CO)(2)-mediated dimerization of di- or tetraethynyltolanes followed by a divergent core extension utilizing tetraphenylcyclopentadienone. The obtained dendrimers are air and water stable, soluble materials that show interesting differences in their hydrodynamic properties as evidenced by gel permeation chromatography. Scanning pulse voltammetry in solution shows that the dendrimers are oxidized at potentials ranging from 0.8 to 0.83 V. The more sterically encumbered the dendrimer, the higher its oxidation potential, that is, the more difficult oxidation is.
The selective monobromination of various deactivated anilines using potassium bromide and sodiumperborate as oxidant has been achieved. The use of ammonium molybdate as catalyst accelerates the rate of reaction but is not essential to obtain good yields and high selectivities.
Multi-component self-assembly in one-pot provides an efficient way for constructing complex architectures using multi-ple-type of building blocks with different levels of interactions orthogonally. The preparation of multiple-type of building blocks typically include tedious synthesis. Here, we developed a multi-component synthesis/self-assembly strategy, which combined covalent interaction (C─N bond
[EN] NOVEL ORGANIC ANTHRACENE COMPOUND AND ORGANIC LIGHT-EMITTING DEVICE COMPRISING SAME<br/>[FR] NOUVEAU COMPOSÉ ANTHRACÈNE ORGANIQUE ET DISPOSITIF ÉLECTROLUMINESCENT ORGANIQUE LE COMPRENANT<br/>[KO] 신규한 유기 안트라센 화합물 및 이를 포함하는 유기발광소자
申请人:SFC CO LTD
公开号:WO2023096387A1
公开(公告)日:2023-06-01
본 발명은 유기발광소자에 사용될 수 있는, [화학식 A] 또는 [화학식 B]로 표시되는 유기 발광 화합물 및 이를 포함하는 유기발광소자에 관한 것이며, 이때 상기 [화학식 A] 및 [화학식 B]는 발명의 상세한 설명에 기재된 바와 동일하다.
Palladium-Catalyzed Regioselective Hydrodebromination of Dibromoindoles: Application to the Enantioselective Synthesis of Indolodioxane U86192A
作者:Junghyun Chae、Stephen L. Buchwald
DOI:10.1021/jo035819k
日期:2004.5.1
A novel approach to the selective preparation of 4-bromoindoles was developed via Pd(OAc)(2)/rac-BINAP catalytic reactions. A variety of 4,6-dibromoindoles were transformed to 4-bromoindoles with high regioselectivity. This methodology, along with C-N and C-O bond-forming reactions developed in our laboratory, was applied to the enantioselective synthesis of indolodioxane U86192A, an antihypertensive agent.