The cyclization of substituted diaryl(hetaryl)alkynes with in-situ-prepared SeBr4 has been achieved. The use of an alkene additive as a bromine scavenger gives simple access to functionalized benzo[b]selenophene and selenophenothiophene derivatives from commercially available or easily accessible starting materials. The reactions can be performed in air without the use of moisture-sensitive reagents
Conjugated polymers and processes for preparing and modifying them
申请人:JAPAN SYNTHETIC RUBBER CO., LTD.
公开号:EP0059646A2
公开(公告)日:1982-09-08
A conjugated polymer having a recurring unit of formula (I) or (II):
(in which Ar and Ar' are the same or different and each represents a heteroaromatic ring) has good heat stability and mouldability. The polymer having a recurring unit of formula (I) may be modified by reaction with an amine or with hydrogen sulphide and both may be modified by doping with an electron-donative compound or an electron-attractive compound, to prepare organic semiconductors or organic conductors having various electrical conductivities.
具有式 (I) 或 (II) 循环单元的共轭聚合物:
(其中 Ar 和 Ar'相同或不同,各自代表一个杂芳香族环)的共轭聚合物具有良好的热稳定性和成型性。具有式(I)循环单元的聚合物可以通过与胺或硫化氢反应进行改性,也可以通过掺杂电子疏导化合物或电子吸引化合物进行改性,以制备具有不同导电率的有机半导体或有机导体。
K<sub>3</sub>PO<sub>4</sub>-KOH Mixture as Efficient Reagent for the Deprotection of 4-Aryl-2-methyl-3-butyn-2-ols to Terminal Acetylenes
作者:Alexey Smeyanov、Andreas Schmidt
DOI:10.1080/00397911.2012.744841
日期:2013.10.18
Abstract A mixture of potassium hydroxide and potassium phosphate was found to be an active reagent mixture for the cleavage of 2-hydroxypropyl-protected acetylenes. The reaction was performed in toluene at reflux temperature and gave terminal acetylenes in good to excellent yields within very short periods of time. Numerous other functional groups are tolerated. Supplementary materials are available
2,5-Bis-(butyltelluro) thiophene as a convenient precursor for the synthesis of 2,5-bis-(acetylenic) thiophenes
作者:Gilson Zeni、Cristina W. Nogueira、Dagoberto O. Silva、Paulo H. Menezes、Antonio L. Braga、Hélio A. Stefani、João B.T. Rocha
DOI:10.1016/s0040-4039(02)02659-x
日期:2003.1
Both symmetrically and unsymmetrically substituted 2,5-bis-(acetylenic) thiophene derivatives were obtained in good yields under mild conditions through palladium-catalyzed cross coupling reaction of 2,5-bis-(butyltelluro) thiophene 2 and terminal alkynes. The methodology represents a general and efficient protocol for carrying out the synthesis of thiophene derivatives with potential biological activities