Palladium (II)‐Catalyzed Decarboxylative Cross‐Dehydrogenative Coupling: Direct Synthesis of
<i>meta</i>
‐Substituted Biaryls from Aromatic Acids
作者:Fan Pu、Lin‐Yan Zhang、Zhong‐Wen Liu、Xian‐Ying Shi
DOI:10.1002/adsc.201800333
日期:2018.7.16
afford meta‐substituted biaryls in moderate to good yields. The reaction proceeds via carboxyl‐directed intermolecular cross‐dehydrogenative coupling and subsequent decarboxylation. The new C−C bonds in this transformation are formed in the ortho position of carboxyl and the reaction tolerates electron‐rich acids. Both symmetrical and unsymmetrical meta‐substituted biaryls can be directly synthesized
The synthesis of several hydrocarbon biradicals consisting of two tetraphenylcyclopentadienyl moieties with different bridge fragments is described. The ESR powder spectra show that there is an intramolecular coupling of two unpaired electron spins to a triplet spin state. The magnitude of the zero field splitting (zfs) is used to discriminate between different molecular conformations. More detailed
Synthesis of sugar-containing polymers by self-condensation with diboronic acid
作者:Masafumi Mikami、Seiji Shinkai
DOI:10.1039/c39950000153
日期:——
Self-condensation of 3,3′-bis(N,N-di-n-butylaminomethyl)biphenyl-4,4′-diboronic acid and saccharides yields polymers containing saccharides in the main chain: they show unique CD spectroscopic properties which reflect the chirality of saccharides.
3,3′-双(N,N-二正丁基氨基甲基)联苯-4,4′-二硼酸与糖类的自缩合产生了主链中含有糖类的聚合物:它们显示出独特的 CD 光谱特性,反映了糖类的手性。
POLYARYLENE BLOCK COPOLYMER AND USE THEREOF
申请人:Sumitomo Chemical Company, Limited
公开号:EP1857482A1
公开(公告)日:2007-11-21
Provided is a polyarylene type block copolymer comprising a block having an ion exchange group and a block having substantially no ion exchange group, wherein the main chain of the block having an ion exchange group has a polyarylene structure in which a plurality of aromatic rings are directly connected, and the ion exchange group is directly bonded to the aromatic ring composing the main chain; a method for production thereof; and a use thereof.