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The crystal and molecular structure of the title compound ( I ) has been determined by three-dimensional X-ray analysis from 750 non-zero reflexions measured photographically. The compound crystallizes in the orthorhombic system, space group P212,21 with a = 7-00 f 0.02, b = 18.93 f 0.03, and c = 5.38 f 0.01 A, Z = 4. The crystal structure has been solved by the symbolic addition procedure applied to non-centrosymmetric crystals, and refined by least-squares calculations to R 0.087. The compound has the exo-conformation. The introduction of an oxygen atom in position 7 of the norbornene skeleton produces interesting modifications in some bond distances and angles.

Aus (I) erhält man mit Polyselenid ein nicht identifiziertes Anion, das durch Chromatographie an einem sauren Ionenaustauscher in Acetonitril in das Selenaboran (III) umgewandelt wird.

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