reduction dominantly occurs over the acetylene reduction. The produced bis(radicalanion) intermediate undergoes a synchronous double-radical 5-endo-dig cyclization. This simple reduction procedure produces two intriguing classes of ladder π-conjugated skeletons, i.e., emissive methylene-bridged stilbenes and dibenzo[a,e]pentalenes regarded as a cyclic 1,4-diphenylbutadiene.
in good yield. Control experiments revealed that the reactions proceed through a multi-step reaction sequence involving a novel intramolecular transamination to the α-acetylenic carbon of the alkynyl group. The method was applicable to the synthesis of dibenzopentalene derivatives as well as various indenone derivatives. A mechanism for the reaction is discussed.
A novel catalytic CâH activation route to privileged dibenzo[a,e]pentalene (DBP) structures has been established. In the presence of PdCl2, AgOTf, and o-chloranil, a CâH/CâH annulation of arylacetylenes takes place to furnish the corresponding DBPs. A number of mechanistic experiments indicate that this new annulation occurs through alkyne-directed, ortho-selective, electrophilic aromatic CâH palladation. Not only symmetric diarylacetylenes but also unsymmetric arylacetylenes are applicable to this reaction. UV-vis absorption spectra and DFT studies on the resulting DBPs indicate a strong substituent effect on the energy levels of the HOMO and HOMOâ1 of DBPs.
申请人:LT Materials Co.,Ltd. 엘티소재주식회사(120060104982) Corp. No ▼ 110111-3251082BRN ▼104-81-94599
公开号:KR101667369B1
公开(公告)日:2016-10-19
본 명세서에는 신규한 구조의 다환 방향족 고리 화합물 및 이를 이용한 유기발광소자가 기재되어 있다.
本说明书中包含了新型结构的多环芳香族环化合物以及利用它们制备的有机发光器件。
Nickel-Catalyzed, Cascade Cycloadditions of 1-Ethynyl-8-halonaphthalenes with Nitriles: Synthesis, Structure, and Physical Properties of New Pyrroloarenes
The reaction of 1‐ethynyl‐8‐halonaphthalenes 1 with nitriles in the presence of the catalytic system [NiBr2(dppe)]/Zn (dppe=1,2‐bis(diphenylphosphino)ethane) is found to produce unusual pyrroloarenes 2. The carbon–nitrogentriplebond in nitrile is activated twice, and five new bonds are formed in a one‐pot transformation, which causes a pyrrole and two six‐membered rings to be generated simultaneously