title: The 2:1 adducts of (benzoylmethylene)triphenylphosphorane with fumaric and terephthalic acids.
abstract: Co-crystals of the ylide (benzoylmethylene)triphenylphosphorane (BPPY) with either fumaric acid, viz. (benzoylmethylene)triphenylphosphorane-fumaric acid (2/1), C(26)H(21)OP.0.5C(4)H(4)O(4), or terephthalic acid, viz. (benzoylmethylene)triphenylphosphorane-terephthalic acid (2/1), C(26)H(21)OP.0.5C(8)H(6)O(4), have a stoichiometric ratio of 2:1 between the ylide and the corresponding dicarboxylic acid. In both adducts, the acid component lies across a centre of inversion. In neither case is the ylide protonated by the organic acid; instead the H atoms of the non-ionized dicarboxylic acid molecules participate in the formation of strong O-H...O hydrogen bonds with the benzoyl O atom of the ylide species. These structures are the first reported examples of co-crystals containing non-protonated BPPY.
authors.affiliation: Department of Chemistry, Durham University, Durham DH1 3LE, England.
authors.forename: Elinor C
authors.initials: EC
authors.lastname: Spencer
authors.forename: M Baby
authors.initials: MB
authors.lastname: Mariyatra
authors.forename: Judith A K
authors.initials: JA
authors.lastname: Howard
authors.forename: K
authors.initials: K
authors.lastname: Panchanatheswaran