Knowledge Bank

As part of a continuing series of studies of polycyclic hydrocarbons, we have investigated the microwave spectrum of bicyclo[3.1.0.]hex-2-ene. By analyzing, the spectra of the normal and $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}C$ isotopic species, sufficient data have been obtained to specify the heavy atom molecular conformation. For the normal isotopic species the rotational constants have the values $A=6306.12\pm 0.01,B=4516.67\pm 0.01$, and $C=3208.82\pm 0.01MHz$. Dipole moment measurements have also been performed and these lead to the values $|\mu a|=0.166,|\mu b|=0.209$, and $|\mu c|=0.119$ Debye. The structural results of this study will be described in detail, and will be compared to those for related molecules.