871012-88-3Relevant articles and documents
Azimuthal Dipolar Rotor Arrays on Surfaces
Berndt, Richard,Hamer, Sebastian,Herges, Rainer,Li, Chao,R?hricht, Fynn,von Glasenapp, Jan-Simon
, p. 17452 - 17458 (2021/11/10)
A set of dipolar molecular rotor compounds was designed, synthesized and adsorbed as self-assembled 2D arrays on Ag(111) surfaces. The title molecules are constructed from three building blocks: (a) 4,8,12-trioxatriangulene (TOTA) platforms that are known to physisorb on metal surfaces such as Au(111) and Ag(111), (b) phenyl groups attached to the central carbon atom that function as pivot joints to reduce the barrier to rotation, (c) pyridine and pyridazine units as small dipolar units on top. Theoretical calculations and scanning tunneling microscopy (STM) investigations hint at the fact that the dipoles of neighboring rotors interact through space through pairs of energetically favorable head-to-tail arrangements.
A Pyridine–Pyridine Cross-Coupling Reaction via Dearomatized Radical Intermediates
Koniarczyk, J. Luke,Greenwood, Jacob W.,Alegre-Requena, Juan V.,Paton, Robert S.,McNally, Andrew
supporting information, p. 14882 - 14886 (2019/11/05)
A pyridine–pyridine coupling reaction has been developed between pyridyl phosphonium salts and cyanopyridines using B2pin2 as an electron-transfer reagent. Complete regio- and cross-selectivity are observed when forming a range of valuable 2,4′-bipyridines. Phosphonium salts were found to be the only viable radical precursors in this process, and mechanistic studies indicate that the process does not proceed through a Minisci-type coupling involving a pyridyl radical. Instead, a radical–radical coupling process between a boryl phosphonium pyridyl radical and a boryl-stabilized cyanopyridine radical explains the C?C bond-forming step.
Highly Branched Dendrimers
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, (2008/12/08)
A dendrimer of formula (I): [DENDRON1]x-CORE-[B-[X]b]a (I) wherein: CORE is a metal ion or a group containing a metal ion, or is a non-polymeric organic group; B is a phenyl ring; a is an integer of from 1 to 8;