Generation of the First Tellurium-Containing Diheteropentalene
摘要:
[GRAPHICS]The known diester dibromomethylthiophene was converted to the tellurolo[3,4-c]thiphene, the first example of a diheteropentalene containing a tellurophene annelated across the 3,4-c position to thiophene. It is stable in solution and adds to DMAD across the 2,5-positions in tellurophene. The intermediate loses tellurium and collapses to a tetracarbomethoxy benzo[c]thiophene derivative.
Condensed Thiophenes and Selenophenes: Thionyl Chloride and Selenium Oxychloride as Sulfur and Selenium Transfer Reagents
作者:Ramiya R. Amaresh、M. V. Lakshmikantham、Jeffrey W. Baldwin、Michael. P. Cava、Robert M. Metzger、Robin D. Rogers
DOI:10.1021/jo010858m
日期:2002.4.1
give dicyano substituted thieno(3,4-c)thiophenes. The use of seleniumoxychloride furnished the corresponding cyano substituted seleno(3,4-c)thiophene. 1,2-Phenylenediacetonitriles gave the corresponding cyano substituted benzo(c)thiophenes and benzo(c)selenenophenes, respectively, upon reaction with thionyl chloride and seleniumoxychloride in the presence of base.