W. Krasuski, M. Regitz
Dec 1, 1984
Citations
0
Influential Citations
3
Citations
Journal
Zeitschrift für Naturforschung B
Abstract
2-(1-Piperidinyl)-1.3-dithioles (6a-c) can be condensed with benzthiazolium- and benzselenazolium perchlorates (7a-d) to the electron-rich olefines 8a-i. By the same synthetic principle the 2-(3.5-diaryl-Δ4-1.3.4-thiadiazolin-2-yliden)-1.3-dithioles 10a-e such as the unsymmetrically substituted bis(3.5-diaryl-Δ4-1.3.4-thiadiazolin-2-ylidenes) (12a-d) are acessible. The olefines 8c and h undergo [2 + 2]-cycloaddition reaction to form the cyclobutenes 16a-d, which isomerize spontaneously by electrocyclic ring opening to the 1.3-butadienes 17a-d.