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The crystal and molecular structure of endo,endo-2,6-diphenacyl[4]peristylane

Published/Copyright: August 25, 2010

Abstract

The crystal and molecular structure of endo,endo-2,6-diphenacyl-[4]peristylane has been determined by X-ray diffraction techniques. The compound crystallizes in the orthorhombic space group Pbca having cell parameters a = 8.662(5), b = 19.75(1), c = 24.10(2) Å and eight molecules per unit cell.

The crystal structure was determined by direct methods. The refinement by a block-diagonal least-squares method led to a final R-value of 0.08 for 2272 observed reflections.

The molecule deviates considerably from C2-symmetry. The fourmembered ring contains a single long C–C bond of 1.58(2) Å. Within the crystal structure the two side chains are pointing outwards from the molecule which explains why the excited state 4 → 5 transformation does not work. The molecules are held together by van der Waals forces.

Published Online: 2010-8-25
Published in Print: 1986-2-1

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