title: Tetra-methyl 1,1,2-triphenyl-2H-1λ-phosphole-2,3,4,5-tetra-carboxyl-ate.
abstract: The title compound, C(30)H(27)O(8)P (1), was formed as one of two products {(1) and (2) [Krawczyk et al. (2010 ▶). Acta Cryst. E66 (cv2753)]} in the reaction of dimethyl acetyl-enedicarboxyl-ate with triphenyl-phosphine. The mol-ecule of (1) consists of a five-membered ring, in which the P atom is incorporated. One of the phenyl groups of the triphenyl-phosphine migrated to a vicinal C atom during the reaction. The five-membered ring of (1) is corrugated [r.m.s. deviation = 0.0719 (8) Å], whereas that in compound (2) is planar, the r.m.s. deviation being only 0.009 (2) Å.
authors: Krzysztof K
authors: KK
authors: Krawczyk
authors: Krystyna
authors: K
authors: Wojtasiewicz
authors: Jan K
authors: JK
authors: Maurin
authors: Ewa
authors: E
authors: Gronowska
authors: Zbigniew
authors: Z
authors: Czarnocki
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