Crystal and molecular structure of 3,3-diphenyl-3-phosphoniabicyclo[3.2.1]oct-6-ene bromide monohydrate

The title compound crystallizes in the monoclinic space group P2₁/n, a=13.429(3), b=18.248(6), c=14.497(4)Å, β=90.61(2)°, Z=8, with two independent molecules in the asymmetric unit. The structure was solved by heavy-atom methods, and refined to a final R value of 0.040. The phosphoranium ring adopts a chair conformation which is substantially flattened at the phosphorus end. The ring conformation and torsion angles are compared with similar compounds.