On heating in sulpholane 4,6-dihydrothieno[3,4-blthiophene 5,5-dioxides give 2,3dihydro-2,3-bis(methylene)thiophenes which can be intercepted in Diels-Alder reactions. Sulphur dioxide is a very efficient trap for these thiophene xylylenes giving the cyclic sulphones by cheletropic addition.
Pyrano[3,4-b]thiophen-5-ones, stable thiophene-2,3-quinodimethaneequivalents
β Scribed by P.Mark Jackson; Christopher J. Moody; Pritom Shah
- Book ID
- 104217643
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- French
- Weight
- 180 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0040-4039
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## Abstract A series of highly airβstable, lowβbandgap poly(3βalkylthiophene)s containing electronβrich thieno[3,2βb]thiophene and electronβdeficient thiazolo[5,4βd]thiazole rings were synthesized by the Stille coupling reaction. The polymers exhibited good thermal stability and solubility with exc
## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Synthesis of Polyfunctionalized Thiophenes and Enediynes via Ring-Opening Reactions of 3-Lithiated Thieno[2,3-b](and [3,2b])thiophenes , 3,4-Dilithiated Thieno[2,3-b]thiophenes and3,6-Dilithiated Thieno[3,2-b]thiophenes. -Solutions of title lithiated thienothiophenes are obtained from the correspond