In marked contrast to the reaction of tetrahydrofuran with TiCl4, tetrahydrothiophene did not afford ring-opened products. Instead, small quantities of ring-dimers were produced, possibly via initial chlorination and dehydrochlorination to produce 2,3-dihydrothiophene. An improved synthesis of 2,3-dihydrothiophene is reported.
P. A. Delaney, R. A. W. Johnstone, P. Boehm and Ian. D. Entwistle, J. Chem. Soc., Perkin Trans. 1, 1986, 1861 DOI: 10.1039/P19860001861
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