title: A stable enol in small ring systems: clear differentiation between penta- and tri-valency of phosphorus atoms.
abstract: The first stable enols in 1,2-dihydrophosphetes and were synthesized and structurally characterized with intermolecular hydrogen bonds to phosphoryl groups in 10-membered dimeric structures; in contrast, trivalent analogue exists in keto-form, where such stabilization by hydrogen bonds is not feasible.
authors.affiliation: DuPont Central Research & Development, Experimental Station, Wilmington, DE 19880-500, USA. alex.s.ionkin@usa.dupont.com
authors.forename: Alex S
authors.initials: AS
authors.lastname: Ionkin
authors.forename: William J
authors.initials: WJ
authors.lastname: Marshall
authors.forename: Brian M
authors.initials: BM
authors.lastname: Fish
authors.forename: Matthew F
authors.initials: MF
authors.lastname: Schiffhauer
authors.forename: Charles N
authors.initials: CN
authors.lastname: McEwen
mesh_terms: D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D007659:Ketones / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D009943:Organophosphorus Compounds / Q000138:chemical synthesis / Q000737:chemistry; D010758:Phosphorus / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D007659:Ketones; D009943:Organophosphorus Compounds; D010758:Phosphorus