Tetrahedron Letters p. 5947 - 5950 (1992)
Update date:2022-07-31
Topics:
Krebs
Franken
Muller
Colberg
Cholcha
Wilken
Ohrenberg
Albrecht
Weiss
Tetra-tert.butylpyrazole (4) and tetra-tert.butylthiophene (11) were prepared starting from the seven membered cycloalkyne 1 and a reductive desulfurization in the last step. Some reactions of 4 and 11 are described. X-ray structural analyses of 11 and the corresponding S,S-dioxide were carried out.
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(1976)
