Stereoselective macrocyclization through zirconocene-mediated coupling of achiral dialkynes
作者:John F. Tannaci、Ian H. Kratter、Eric A. Rider、Jennifer L. McBee、Adam D. Miller、T. Don Tilley
DOI:10.1039/b815750b
日期:——
1,4-Bis[trimethylsilyl(ethynyl)]naphthalene (1a) and 1,4-bis[trimethylsilyl(ethynyl)]anthracene (1b) undergo diastereoselective coupling with Cp2Zr(py)(Me3SiCCSiMe3) to give trimeric macrocycles in good yield.
Oxidized divinyl oligoacene-bridged diruthenium complexes: bridged localized radical characters and reduced aromaticity in bridge cores
作者:Ya-Ping Ou、Jing Zhang、Yuxuan Hu、Jun Yin、Chunyan Chi、Sheng Hua Liu
DOI:10.1039/d0dt02883e
日期:——
predicted via time-dependent DFT calculations suggested that strong bridged ligands participate in redox processes. NIR absorptions were not observed in complexes 4+ and 5+ possibly because of instability in their twisted and noncoplanar geometry. Electron paramagnetic resonance results and spin density distribution demonstrated that the bridged localized degrees of 1+–5+ successively increased with the extension
Acene Size‐Dependent Transition of The Radical Centers From the Metal to The Acene Parts In Monocationic Dinuclear (Diethynylacene)diyl Complexes
作者:Yuya Tanaka、Reo Kawano、Munetaka Akita
DOI:10.1002/chem.202201358
日期:2022.10.4
Charge-delocalization of various monocationic diruthenium (p-diethynylacene)diylcomplexes was investigated. The distribution of the radicalcenters is dependent on the acene moieties; namely, the radicalcenters are shifted from the metal moiety (benzene) to the bridging dinuclear part (anthracene) and then to the acene part (pentacene).
Thermal migration of an ethynyl group from one benzene ring to another by reversible vinylidene CH insertion
作者:Lawrence T. Scott、Atena Necula
DOI:10.1016/s0040-4039(97)00225-6
日期:1997.3
Evidence is presented for the high temperature opening of a 5-membered ring by extrusion of a carbene (the reverse of a CH bond insertion), which results in the net thermalmigration of an ethynyl group from one benzene ring to another.
Photoalignment Layers for Liquid Crystals from the Di-π-methane Rearrangement
作者:Jason R. Cox、Jeffrey H. Simpson、Timothy M. Swager
DOI:10.1021/ja312090p
日期:2013.1.16
Photoalignment of nematic liquid crystals is demonstrated using a di-π-methanerearrangement of a designed polymer. The alignment mechanism makes use of the strong coupling of the liquid crystal directors to dibenzobarrelene groups. The large structural changes that accompany photoisomerization effectively passivate segments of the polymer, allowing the remaining dibenzobarrelene groups to dominate