title: (S(P),S(P))-(-)-(E)-1,2-Bis(methyl-phenyl-phosphino-yl)ethene.
abstract: The title compound, C(16)H(18)O(2)P(2), possesses two stereogenic P atoms and shows a distorted s-cis conformation of each O=P-C=C moiety. This has been suggested on the basis of the stereochemical result of 1,3-dipolar cyclo-additions with nitro-nes and is now confirmed by the present crystal structure analysis. There are two crystallographically independent molecules in the asymmetric unit.
authors.forename: Holger
authors.initials: H
authors.lastname: Butenschön
authors.forename: Nikolai
authors.initials: N
authors.lastname: Vinokurov
authors.forename: Ingmar
authors.initials: I
authors.lastname: Baumgardt
authors.forename: K Michal
authors.initials: KM
authors.lastname: Pietrusiewicz