ChemInform Abstract: STEREOCHEMIE DER ADDUKTE VON CIS‐CYCLOHEXEN‐(4)‐DICARBONSAEURE‐(1,2)‐ANHYDRID AN HEXACHLOR‐ UND 5,5‐DIALKOXY‐TETRACHLOR‐CYCLOPENTADIENE

Abstract

Die Addition des Anhydrids (II) an die Cyclopentadiene (I) liefert die endoexo‐Addukte (III) mit Wannen‐Konformation des Cyclohexan‐Fragments.

Synthesis of 1,8,11,12-Tetrachlorotricyclo[6.2.2.02,7]dodec-2-ene-4,5:9,10-bis(dicarboximides)

“…The steric structure of compound I was determined by measuring its dipole moment [3]. In continuation of these studies, the present communication reports on the synthesis of 1,8,11,12- reactions were carried by heating the reactants in dimethylformamide (DMF) for 5-6 h, and the products were diimides V-XII (see table).…”

Synthesis and stereochemistry of N,N’-oxy(methylene)-diphenylene-bridged polychlorinated cage-like tetracarboxylic acid imides

“…The steric structure of dianhydride IIa was unambiguously determined previously by measuring its dipole moment [8]. Insofar as replacement of planar anhydride ring by analogous imide ring in the cyclohexane fragment should not change the steric structure, bis-imides were assigned configuration A [9]. Structure B with anti conformation of the sixmembered rings seems to be improbable because of strong repulsion between the C-H groups in the imide ring and unsaturated bridge.…”