title: 1-(4-Chloro-phenyl)-2-[tris-(4-methyl-phenyl)-λ(5)-phosphanyl-idene]butane-1,3-dione.
abstract: In the title ylide, C(31)H(28)ClO(2)P [common name α-acetyl-α-p-chloro-benzoyl-methyl-enetri(p-tol-yl)phospho-rane], the dihedral angle between the 4-chloro-phenyl ring and that of the ylide moiety is 66.15 (10)°. The geometry around the P atom is slightly distorted tetra-hedral [angle range = 105.22 (8)-115.52 (9)°] and the carbonyl O atoms are syn-oriented with respect to the P atom. The ylide group is close to planar [maximum deviation from the least-squares plane = 0.006 (2) Å] and the P-C, C-C and C=O bond lengths are consistent with electron delocalization involving the O atoms.
authors: Faculty of Chemistry, Bu-Ali Sina University, Hamedan 65174,  Iran.
authors: Seyyed Javad
authors: SJ
authors: Sabounchei
authors: Parisa
authors: P
authors: Shahriary
authors: Faegheh
authors: F
authors: Hosseini Fashami
authors: David
authors: D
authors: Morales-Morales
authors: Simon
authors: S
authors: Hernandez-Ortega