Nucleophilic displacement method for synthesis of non-rigid PBZ polymers
申请人:The Dow Chemical Company
公开号:US05194562A1
公开(公告)日:1993-03-16
Azole rings, such as oxazole and thiazole rings, can activate an aromatic ring bonded to a leaving group such as a halogen atom so that the aromatic ring will undergo aromatic nucleophilic substitution. The reaction is useful for making ethers, thioethers and amines containing azole rings. In particular, monomers having azole rings, activated aromatic rings with leaving groups and nucleophilic moieties can react under conditions of aromatic nucleophilic displacement to form non-rigid rob PBZ polymers. The non-rigid rod PBZ polymers can be used to form molecular composites with rigid rod PBZ polymers which molecular composites are not substantially phase separated.
Monomers useful in nucleophilic displacement synthesis of polybenzazole
申请人:The Dow Chemical Company
公开号:US05216110A1
公开(公告)日:1993-06-01
Azole rings, such as oxazole and thiazole rings, can activate an aromatic ring bonded to a leaving group such as a halogen atom so that the aromatic ring will undergo aromatic nucleophilic substitution. The reaction is useful for making ethers, thioethers and amines containing azole rings. In particular, monomers having azole rings, activated aromatic rings with leaving groups and nucleophilic moieties can react under conditions of aromatic nucleophilic displacement to form non-rigid rod PBZ polymers. The non-rigid rod PBZ polymers can be used to form molecular composites with rigid rod PBZ polymers which molecular composites are not substantially phase separated.
Optimal Balance in the Catalyst Dynamics Enables C(2)−H Arylation of (Benz)imidazoles and (Benz)oxazoles by an
<i>In Situ</i>
‐Generated Ni/NHC System
作者:Oleg V. Khazipov、Konstantin E. Shepelenko、Safarmurod B. Soliev、Ksenia A. Nikolaeva、Victor M. Chernyshev、Valentine P. Ananikov
DOI:10.1002/cctc.202201055
日期:2022.12.20
C(2)−Harylation of (benz)imidazoles and (benz)oxazoles with aryl chlorides and aryl bromides catalyzed by a Ni/NHCsystemgenerated in situ from cheap air-tolerant precursors without using special Ni(II) reductants has been developed.
Design, Synthesis and Characterization of Palladium‐Functionalized Covalent Organic Framework and Its Application as Heterogeneous Catalysis for C−H Arylation of Azoles
A palladium-functionalized covalentorganicframework with high thermal and chemical stabilities has been prepared and used as heterogeneous ligand to immobilize PdII. The resulting Pd-bound COF was found to be an efficient heterogeneous catalyst for the C−H arylation of azoles and aryl halides with high recyclability.