Cyclo-oligomerization of 6,12-Diethynyl Indeno[1,2-b]fluorenes via Diradical Intermediates
摘要:
Indeno[1,2-b]fluorene derivatives with trimethlysilylethynyl substituents at the 6- and 12-positions were found to undergo cyclo-dimeerzatin cyclo-trimaerzatio and higher oligomerization at room tempeatrue. The cyclic dimer feature a novel double-decker motif, composed of two face-to-face stacked bis(propadienylide)dihydroindeno[1,2-b] flourenes with a short centroid-to- centroid distance of 3.50 angstrom. The existence of a cyclic timer and higher oligemers was indeno[1,2-b]fluorene moiety.
Cyclo-oligomerization of 6,12-Diethynyl Indeno[1,2-b]fluorenes via Diradical Intermediates
摘要:
Indeno[1,2-b]fluorene derivatives with trimethlysilylethynyl substituents at the 6- and 12-positions were found to undergo cyclo-dimeerzatin cyclo-trimaerzatio and higher oligomerization at room tempeatrue. The cyclic dimer feature a novel double-decker motif, composed of two face-to-face stacked bis(propadienylide)dihydroindeno[1,2-b] flourenes with a short centroid-to- centroid distance of 3.50 angstrom. The existence of a cyclic timer and higher oligemers was indeno[1,2-b]fluorene moiety.
been developed via an efficient Pd-catalyzed carbonylative multiple C–Cbondformation. Under a CO atmosphere, using commercially available aryl halides and arylboronic acids as substrates, this three-component reaction proceeded smoothly in moderate to excellent yields with good functional-group compatibility. The mechanistic investigations suggested a sequential process for the reaction that forms o-bromobiaryls
developing new conducting or electrochromic materials as well as in the construction of redox-controlled supramolecularassemblies. In this work, dimeric structures of the redox-active indenofluorene-extended tetrathiafulvalene (IF-TTF) unit were synthesized in a stepwise protocol. The synthesis relied on the development of a new unsymmetrical IF-TTF building block by a combination of phosphite-mediated
can also be regarded as “super-extended” tetrathiafulvalenes (TTFs) with some of the largest cores ever explored, being multi-redox systems that exhibit both reversible oxidations and reductions. Concomitant absorption redshifts were observed when expanding the ladder-type structures from one to two to three indenofluorene units, and optical and electrochemical HOMO-LUMO gaps were found to correlate
Synthesis of redox-active donor/acceptor chromophores with a central indenofluorene or indacenodithiophene core
作者:Dianna Andersen、David Bo Nygaard、Rasmus Refsgaard Kragh、Line Broløs、Mogens Brøndsted Nielsen
DOI:10.1016/j.tetlet.2020.151939
日期:2020.6
Tetrathiafulvalene (TTF) and tetracyanoquinodimethane (TCNQ) are classical redox-active molecules that can be oxidized and reduced, respectively, in two one-electron steps. Herein we present the synthesis of a selection of extended derivatives based on either an indenofluorene or indacenodithiophene core and containing either two dithiafulvene units (extended TTF), two dicyanomethylene units (extended