Der Tetracyclus (I) reagiert mit N‐Chlorsuccinimid (NCS) zu den Chlorhydrinen (II) und (III), die über das α‐Epoxid (IV) in das Östrogen‐Analoge (V) übergeführt werden.

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Rec. trav. chim. 96 279-292/m1 -ml44 (1 977)/RTCPA3-96 (1 1 ) 279-292/m1 -ml44 (1 977)lnovember 1977Abstract. The synthesis of tetracycles of type 1 is described. Both l a and lb are converted into the estrogen-like compounds 12a and 12b via the corresponding a-epoxides. The P-epoxides yield mixtures of dienes. The stereochemical influence of the base on the alkene precursors for tetracyclic compounds, formed under Wittig-Schlosser conditions, has been established. Finally, evidence is offered for the trans,anti,trans geometry in the tetracyclic molecules under discussion. A. Corvers, J. H. van Mil, M. M. E. Sap and H. M. Buck, Red. Trav. Chim. Pays-Bas 96, 18 (1977). P. A. Bartlett and W. S. Johnson, J. Amer. Chem. SOC. 95,7501 (1973). D.Abstract. Flash vapour-phase pyrolysis' of 2,5-or 2,4-dialkyl-, 2,Sdiphenyl-and dibenzothiophene 1,l-dioxides at temperatures above 800°C/10-2 mm Hg results in the formation of the corresponding furans. Thiophenes are obtained as co-products if stabilized cyclobutadiene-type intermediates can occur, especially at lower temperatures (