Extended π system: A nickel(0)‐mediated reaction afforded dinaphthopentalenederivatives, whose electronic and electrochemical properties depend on the fusion patterns. Very high hole mobility was observed for an amorphous material, and the compounds are applicable to organic heterojunction photovoltaic cells (see picture).
Syntheses of substituted benzosiloles and siloles by diisobutylaluminium hydride-promoted cyclization of 1-silyl-2-(2-silylethynyl)benzenes and 1,4-disilylalk-3-en-1-ynes
hydrosilanes underwent the DIBAL-H-promoted cyclization to benzosiloles. When 1-hydrosilyl-2-[2-(trimethylsilyl)ethynyl]benzenes were used as substrates, a substoichiometric amount of DIBAL-H was enough for the cyclization. The DIBAL-H-promoted transformation could be applied to regio-defined synthesis of unsymmetrically substituted siloles from 4-hydrosilyl-1-silylalk-3-en-1-ynes. This pre-installation
作者:Marvin Nathusius、Barbara Ejlli、Frank Rominger、Jan Freudenberg、Uwe H. F. Bunz、Klaus Müllen
DOI:10.1002/chem.202001808
日期:2020.11.26
bisbenzannulated homologue, naphtho[2,3‐c]tetraphene, were synthesized through a PtCl2‐catalyzed cyclization of alkynes, which also furnished corresponding biaryls subsequent to a Glaser coupling reaction of the starting alkynes. The optoelectronic properties of 5,5′‐bichrysenyl and 6,6′‐binaphtho[2,3‐c]tetraphene were compared to their chrysene‐based “monomers”. Oxidative cyclodehydrogenations of bichrysenyl
通过PtCl 2催化的炔烃环合反应合成了丙烯及其双苯甲酰化的萘酚[2,3- c ]四苯酚,在炔烃的Glaser偶联反应之后,它还提供了相应的联芳基。比较了5,5'-双烯基和6,6'-联萘[2,3- c ]四苯的光电性能与它们的基于丙烯的“单体”。还研究了联苯基的氧化环脱氢及其向大型纳米石墨烯的更高同系物。
Intramolecular addition of benzyl anion to alkyne utilizing [1,2]-phospha-Brook rearrangement under Brønsted base catalysis
A novel reaction system for intramolecular addition of benzyl anions to alkynes was developed by utilizing the [1,2]-phospha-Brook rearrangement under Brønsted base catalysis. The present reaction is a rare example of a catalytic additionreaction of an unstabilized benzyl anion under Brønsted base catalysis.
Diisobutylaluminum Hydride Promoted Selectivity-Switchable Synthesis of Benzothiophene Oxides and Benzothiophenes via an Al–Li-Dimetalated Intermediate
We developed an efficient and direct method for synthesis of benzothiophene oxides from 1-bromo-2-[2-(trimethylsilyl)ethynyl]benzenes and thionylchloride as an easily accessible source of the sulfinyl group. Benzothiophenes were also synthesized selectively by simply increasing the amount of thionylchloride. These methods achieved efficient syntheses of various benzothiophene oxides and benzothiophenes