Preparation of Orthogonal π-Conjugated Aryl Alkynes and Cyclophanes
摘要:
A series of anthracene based orthogonal pi-conjugated aryl alkynes was prepared using palladium-catalyzed couplings. Thia- and azacyclophanes were prepared from anthracene based orthogonal a-conjugated aryl alkynes. (C) 2000 Elsevier Science Ltd. All rights reserved.
A new series of silacyclophanes with two disilanyl pillars has been synthesized using a straightforward method. A silylation reaction of 1,8‐dilithioanthracenes allowed the connection of two anthracene rings with two SiSi bonds to afford disilanyl double‐pillared bisanthracenes (SiDPBAs). The major product had an anti geometry of the anthracene rings, and a unique steplike structure favorable for σ–π
of 2,6‐bis(1H‐pyrazol‐1‐yl)pyridine are linked through multi‐1,8‐diethynylanthracene moieties. The optimized synthesis of the three isostructural analogues 1 a, 1 b, and 1 c, containing the anthraquinone, anthracene, and 10‐methoxyanthracene units, respectively, is reported. The resulting spatial face‐to‐face arrangement of the peripheral anthracene rings enables to trigger the intramolecular [4+4]
1,8-Diiodoanthracene was synthesized from 1,8-dichloroanthraquinone in three steps by improved procedures in 41% overall yield. Some anthracene derivatives carrying multiple phenylethynyl groups were synthesized from 1,8-diiodoanthracene and 4,5-diiodo-9-anthrone.
The synthesis of bis(oligophenyleneethynylenes): novel potential nonlinear optical materials
作者:David J. Armitt、Geoffrey T. Crisp
DOI:10.1016/j.tet.2005.11.015
日期:2006.2
Various functionalised phenyleneethynylene dimers 10 and trimers 12 were synthesised by palladium-catalyzed Sonogashira methodology. These dimers and trimers were coupled to 1,8-diido-10-methoxyanthracene to generate bis(oligophenyleneethynylenes) 17 and 18. Preliminary results towards the construction of both phenyleneethynylene and phenylenevinylene hybrid motifs are presented. (c) 2005 Elsevier Ltd. All rights reserved.
Quintet Bis(carbene) from Triplet Diarylcarbenes Introduced at the 1,8-Position of Anthracene
[9-10-Phenyl}anthryl](4-bromo-2,6-dimethylphenyl)diazomethane was found to be stable enough to survive Sonogashira coupling reaction conditions and was converted to [9-10-phenyl}anthryl](4-trimethylsilyiethynyl-2,6-dimethylphenyl)diazomethane, which was reacted with 1,8-dliodoanthracene to give bis(diazo) compound. Bis(carbene) generated by irradiation of the bis(diazo) compound generated a fairly persistent S = 2 quintet state.