A new antiaromatic compound: 1,4-biphenylenequinone synthesis and trapping reactions: can a quinone unit stabilize the cyclobutadiene?
摘要:
The photooxygenation of 4a,8b-dihydrobiphenylene affords an endoperoxide. NEt3-catalyzed rearrangement of this endoperoxide gave the corresponding hydroxy enone, while the CoTPP-catalyzed rearrangement afforded a bisepoxide. MnO2 oxidation of hydroxy enol leads to 4a,8b-dihydrobiphenylene-1,4-dione. The NIBS bromination of this dione produces mono- and dibromides. NEt3-supported elimination of monobromide and zinc elimination of dibromide afforded the target compound, 1,4-biphenylenequinone, which was trapped as the dimer and cycloadducts with cyclopentadiene and anthracene, respectively. Furthermore, 1,4-biphenylenequinone was generated upon oxidation of biphenylene-1,4-diol with bis(trifluoroacetoxy)iodobenzene (PIFA). The stability and reactivity of the title compound is discussed. (C) 2001 Elsevier Science Ltd. Ail rights reserved.
A new antiaromatic compound: 1,4-biphenylenequinone synthesis and trapping reactions: can a quinone unit stabilize the cyclobutadiene?
摘要:
The photooxygenation of 4a,8b-dihydrobiphenylene affords an endoperoxide. NEt3-catalyzed rearrangement of this endoperoxide gave the corresponding hydroxy enone, while the CoTPP-catalyzed rearrangement afforded a bisepoxide. MnO2 oxidation of hydroxy enol leads to 4a,8b-dihydrobiphenylene-1,4-dione. The NIBS bromination of this dione produces mono- and dibromides. NEt3-supported elimination of monobromide and zinc elimination of dibromide afforded the target compound, 1,4-biphenylenequinone, which was trapped as the dimer and cycloadducts with cyclopentadiene and anthracene, respectively. Furthermore, 1,4-biphenylenequinone was generated upon oxidation of biphenylene-1,4-diol with bis(trifluoroacetoxy)iodobenzene (PIFA). The stability and reactivity of the title compound is discussed. (C) 2001 Elsevier Science Ltd. Ail rights reserved.
This invention seeks to provide a fiber formed of an aromatic polyazole that has a high molecular weight and is excellent in mechanical properties such as elastic modulus, strength, etc., and a process for the production thereof.
This invention provides a fiber formed of a polyazole containing a recurring unit of the following formula (1),
wherein Ar1 is a divalent aromatic group having 4 to 20 carbon atoms, Ar2 is a tetravalent aromatic group having 4 to 20 carbon atoms and each X is O, S or NH,
and having a phosphorus atom content of 30 ppm or less, and a process for the production thereof.
POLYAZOLE FIBER AND PROCESS FOR THE PRODUCTION THEREOF
申请人:Chokai Masayuki
公开号:US20100222544A1
公开(公告)日:2010-09-02
This invention seeks to provide a fiber formed of an aromatic polyazole that has a high molecular weight and is excellent in mechanical properties such as elastic modulus, strength, etc., and a process for the production thereof.
This invention provides a fiber formed of a polyazole containing a recurring unit of the following formula (1),
wherein Ar
1
is a divalent aromatic group having 4 to 20 carbon atoms, Ar
2
is a tetravalent aromatic group having 4 to 20 carbon atoms and each X is O, S or NH,
and having a phosphorus atom content of 30 ppm or less, and a process for the production thereof.
US4435294A
申请人:——
公开号:US4435294A
公开(公告)日:1984-03-06
A new antiaromatic compound: 1,4-biphenylenequinone synthesis and trapping reactions: can a quinone unit stabilize the cyclobutadiene?
作者:Hamdullah Kiliç、Metin Balci
DOI:10.1016/s0040-4020(01)01008-0
日期:2001.12
The photooxygenation of 4a,8b-dihydrobiphenylene affords an endoperoxide. NEt3-catalyzed rearrangement of this endoperoxide gave the corresponding hydroxy enone, while the CoTPP-catalyzed rearrangement afforded a bisepoxide. MnO2 oxidation of hydroxy enol leads to 4a,8b-dihydrobiphenylene-1,4-dione. The NIBS bromination of this dione produces mono- and dibromides. NEt3-supported elimination of monobromide and zinc elimination of dibromide afforded the target compound, 1,4-biphenylenequinone, which was trapped as the dimer and cycloadducts with cyclopentadiene and anthracene, respectively. Furthermore, 1,4-biphenylenequinone was generated upon oxidation of biphenylene-1,4-diol with bis(trifluoroacetoxy)iodobenzene (PIFA). The stability and reactivity of the title compound is discussed. (C) 2001 Elsevier Science Ltd. Ail rights reserved.