Crystal and molecular structure of 3,3-diphenyl-3-phosphoniabicyclo[3.2.1]octane bromide monohydrate

The title compound crystallizes in the monoclinic space group P2₁/n, with a=13.316(2), b=18.513(3), c=14.621(4) Å, β=90.73(2)°, Z=8, and two independent molecules in the asymmetric unit. The structure was solved by heavy-atom methods and refined to a final R value of 0.036. The phosphoranium ring adopts a chair conformation, which is substantially flattened at the phosphorus end. The ring conformation and torsion angles are compared with those of similar compounds.