Carbene, 15: Die Kristall‐ und Molekülstruktur von (E)‐2‐Methyl‐4,5,6‐triphenyl‐1,3,4λ⁵‐dioxaphosphorin‐4‐on, C₂₂H₁₉O₃P

Abstract

Die Titelverbindung4 kristallisiert in der triklinen Raumgruppe PT mit Z = 4. Der heterocyclische Sechsring nimmt eine abgeflachte Halbsesselform ein. Das Sauerstoffatom am Phosphor und die Methylgruppe stehen auf verschiedenen Seiten des Rings, sind also E-konfiguriert. Carbenes, 15"The Crystal and Molecular Structure of (E)-2-Methyl-4,5,6-triphenyl- ,3,4Lsdioxaphosphorin-4-one, C,,H I ,O,PThe title compound 4 crystallizes in the triclinic space group PT with Z = 4 molecules in the unit cell. The six-membered heterocyclic ring takes a flattened half-chair conformation. The oxygen bound to phosphorus and the methyl group point to opposite sides of the ring, i.e. they are E-configurated.

Heterocycles Derived from Heteroatom-Substituted Carbenes

“…The short-lived benzoylphosphene 78 , generated photochemically from (diazophenacyl)diphenylphosphine oxide 76 via a [1,2]-phenyl shift of the phosphorylcarbene intermediate 77 , undergoes [4 + 2]-cycloaddition with ketones or aldehydes affording 1,3,4λ 5 -dioxaphosphorins 79 (Scheme ) . The structure of dioxaphosphorin derived from acetaldehyde was determined unambiguously by X-ray crystallography 15 …”