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The crystal and molecular structure of β-chloroethyl triptycene

Published/Copyright: July 28, 2010
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Abstract

β chloroethyl triptycene, C22H17Cl, crystallizes with two molecules per asymmetric imit in space group P21/c with a = 15.99 Å, b = 15.46 Å, c = 16.48 Å, and β = 126°42′. The triptycene nucleus has an approximate three-fold axis of symmetry. The chloroethyl chain lies nearly in the plane of one of the phenyl groups and is oriented in the trans conformation with respect to that phenyl group. The three phenyl groups in each molecule have normal C–C bond lengths near 1.39 Å, while the apical bonds in the eight-membered cage have an average length of 1.53 Å. The apical angles in the cage are near 105° while the angles in the cage adjacent to the phenyl groups are near 113°. Phases for the structure determination were obtained directly from the magnitudes of the intensities by the use of the symbolic-addition procedure.

Published Online: 2010-07-28
Published in Print: 1969-03
Downloaded on 2.12.2025 from https://www.degruyterbrill.com/document/doi/10.1524/zkri.1969.128.3-6.371/pdf
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