725213-45-6Relevant academic research and scientific papers
LiHMDS-Promoted Palladium-Catalyzed Sonogashira Cross-Coupling of Aryl Fluorides with Terminal Alkynes
He, Jingjing,Yang, Kang,Zhao, Jianhong,Cao, Song
supporting information, p. 9714 - 9718 (2019/11/28)
A highly efficient Pd-catalyzed Sonogashira coupling of various aryl fluorides with terminal alkynes in the presence of LiHMDS was developed. Both unreactive electron-rich fluoroarenes and electron-poor fluoroarenes proceeded smoothly and afforded the cor
Fluorescence of a chiral pentaphene derivative derived from the hexabenzocoronene Motif
Rietsch, Philipp,Soyka, Jan,Brülls, Steffen,Er, Jasmin,Hoffmann, Katrin,Beerhues, Julia,Sarkar, Biprajit,Resch-Genger, Ute,Eigler, Siegfried
supporting information, p. 10515 - 10518 (2019/09/06)
A new fluorescent pentaphene derivative is presented that differs from hexabenzocoronene (HBC) by one carbon atom in the basal plane skeleton. A 500% increased fluorescence quantum yield is measured compared to the HBC derivative. The pentaphene compound,
Synthesis of Functionalized Phenanthrenes via Regioselective Oxidative Radical Cyclization
Pati, Kamalkishore,Michas, Christopher,Allenger, David,Piskun, Ilya,Coutros, Peter S.,Dos Passos Gomes, Gabriel,Alabugin, Igor V.
, p. 11706 - 11717 (2015/12/11)
The majority of Sn-mediated cyclizations are reductive and, thus, cannot give a fully conjugated product. This is a limitation in the application of Sn-mediated radical cascades for the preparation of fully conjugated molecules. In this work, we report an oxidatively terminated Bu3Sn-mediated cyclization of an alkyne where AIBN, the commonly used initiator, takes on a new function as an oxidative agent. Sn-mediated radical transformation of biphenyl aryl acetylenes into functionalized phenanthrenyl stannanes can be initiated via two potentially equilibrating vinyl radicals, one of which can be trapped by the fast 6-endoclosure at the biphenyl moiety in good to excellent yields. The efficient preparation of Sn-substituted phenanthrenes opens access to convenient building blocks for the construction of larger polyaromatics.
Synthesis of fluorenes via the palladium-catalyzed 5-exo-dig annulation of o-alkynylbiaryls
Chernyak, Natalia,Gevorgyan, Vladimir
experimental part, p. 1101 - 1114 (2009/12/07)
The direct palladium-catalyzed intramolecular hydro arylation of o-alkynylbiaryls proceeded in a highly stereoselective manner producing fluorenes 2, the products of 5-exo-dig cyclization, in excellent yields. The cascade intermolecular arylation, incorpo
