The structure of 1,5-diphenyltricyclo[2,1,0,02,5]pent-3-yl p-bromobenzoate

Abstract

Crystals of 1,5-diphenyltricyclo[2,1,0,0^2,5]pent-3-yl p-bromobenzoate are triclinic, a= 5·92, b= 8·98, c= 17·85 Å, α= 89° 17′, β= 82° 46′, γ= 89° 50′, Z= 2, space-group P. The structure was determined with visual Cu-K_α data by Patterson and Fourier methods, and refined by least-squares, the final R being 0·16 for 1228 observed reflexions. The tricyclopentane system is highly strained, with six C–C–C angles of 60°, three of 80°, and four of 90°, and an intramolecular non-bonded C ⋯ C distance of 1·99 Å. The C–C bond lengths are similar to those of normal single-bonds, except for the bond common to the two three-membered rings, which is possibly slightly shorter than the others.