Polycyclic Aromatic Hydrocarbons by Ring-Closing Metathesis
作者:Margel C. Bonifacio、Charles R. Robertson、Jun-Young Jung、Benjamin T. King
DOI:10.1021/jo051418o
日期:2005.10.1
A strategy for the synthesis of polycyclic aromatichydrocarbons (PAHs) by the ring-closing olefin metathesis (RCM) of pendant olefins on a phenylene backbone has been developed. RCM of 2,4‘,6‘,2‘ ‘-tetravinyl-[1,1‘;3‘,1‘ ‘]terphenyl and 2,2‘,5‘,2‘ ‘-tetravinyl-[1,1‘;4‘,1‘]terphenyl affords in high yield the isomeric [a,j] and [a,h] dibenzanthracenes, respectively. In contrast with other intramolecular
申请人:The United States of America as represented by the Secretary of the Air
公开号:US04657708A1
公开(公告)日:1987-04-14
Aromatic monomers, each containing at least one o-ethynyl carboxylic acid halide subunit: ##STR1## wherein X is Cl or Br. These monomers can be reacted with amines to form aromatic polyamide resins which can be thermally treated to undergo intromolecular cyclization, without evolution of volatiles, into polyimidines.
Boron-Doped Pentacenes: Isolation of Crystalline 5,12- and 5,7-Diboratapentacene Dianions
作者:Joshua E. Barker、Akachukwu D. Obi、Diane A. Dickie、Robert J. Gilliard
DOI:10.1021/jacs.2c11494
日期:2023.2.1
molecular structures, reactivities, and computational assessment of dipotassium diboratapentacene isomers are described (1 and 2). These compounds represent the first examples of aromatized diboraacenes where the boron atoms are spatially separated in different rings of the acene framework. Both 1 and 2 react with carbon dioxide (CO2) via diastereoselective carboxylation of the pentacene backbone that
Two constitutional dynamic libraries (CDLs)-each containing two amines, two dialdehydes, and two metal salts-have been found to self-sort, generating two pairs of imine-based metallosupramolecular architectures (sharing no component) each with a [2 x 2] grid-like complex and a linear double helicate. These CDLs provided unique examples of a three-level self-sorting process, as only two imine-based ligand constituents, two metal complexes, and two architectures were selected during their assembly out of all the possible combinations of their initial components. The metallosupramolecular architectures assembled were characterized by NMR, mass spectroscopy, and X-ray crystallography.