electronic reprint Acta Crystallographica Section E Structure Reports Online ISSN 1600-5368 Editors: W. Clegg and D. G. Watson cis-Ethylenebis(diphenylphosphine oxide) Judy Caddy, E. Mabel Coyanis, Manuel A. Fernandes, Setshaba D. Khanye and Bernard Omondi Copyright © International Union of Crystallography Author(s) of this paper may load this reprint on their own web site provided that this cover page is retained. Republication of this article or its storage in electronic databases or the like is not permitted without prior permission in writing from the IUCr. Acta Cryst. (2007). E63, o1387–o1389 Caddy et al. C 26 H 22 O 2 P 2