The generation of 2,3-dihydro-2,3-bis-(m
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A.P.A. Crew; G. Jenkins; R.C. Storr; M. Yelland
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Article
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1990
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Elsevier Science
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French
โ 219 KB
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.