Archiv der Pharmazie p. 968 - 976 (1985)
Update date:2022-08-02
Topics:
Hartke, Klaus
Hoederath, Wolfgang
Krampitz, Dieter
Indeno<2,1-c>-1,2-dithioles 1 "dimerize" under acid catalysis by loss of two sulfur atoms to form diindenothiopyrans 2I/II.An analogous reaction is known for 3-methyl-5-phenyl-1,2-dithiolylium perchlorate (3) which condenses in glacial acetic acid/pyridine to the isomeric thiopyrans 4I/II.Reactions of 1-acyl-2-indanones 13 in acetic anhydride/perchloric acid yield the oxygen compounds 14 and 15, which are structurally analogous to 2I/2II.
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Doi:10.1002/jhet.5570450332
(2008)Doi:10.1021/jo01354a618
(1957)Doi:10.1016/j.tetlet.2013.10.031
(2013)Doi:10.1246/cl.1985.1879
(1985)Doi:10.1246/cl.1985.1535
(1985)Doi:10.1021/ja00282a021
(1986)