Crystal and molecular structure of a naphthalene-tolan photoadduct: 1,8-Diphenyl-1a,2,7,7a-tetrahydro-1,2,7-metheno-1H-cyclopropa[b]naphthalene

The title compound, C₂₄H₁₈, crystallizes in the monoclinic space groupP2₁/c with cell parametersa=16.382(10),b=6.360(3),c=18.051(11) Å, =116.6(1) °,Z=4,V=1695.6 ų. The structure was solved by direct methods and refined using least-squares procedures to a finalR of 0.097 for 811 observed (I>2₁) structure magnitudes. The variables refined were the fractional coordinates of all atoms and the individual isotropic temperature factors of the nonhydrogen atoms. The highly strained molecule has single carbon-carbon bond distances of 1.47–1.59 Å, and bond angles between 59 and 136 °.