Knowledge Bank

The microwave spectrum of methoxy ozonide (3-methoxy-1,2,4-trioxolane) has been assigned. The ground state rotational constants for the parent species are: $A=4815.375(4)MHz,B\equiv 2435.842(3)MHz$ and $C=2336.66(4)MHz$. Spectra have also been assigned for the three species singly deuterated on the ring as well as the $5,5=d2$ species, the $3,5,5=d3$ species and the $OCD3$ species. For the $trans=d1$ and the $OCD3$ species only Q branch transitions have been assigned. A least-squares fit of the structure to twenty-two inertial parameters including moments of inertia, A-C, and Kappa indicates an axial methoxy group oriented over the ring. The dihedral angle $Oe=C=O=CH3$ is approximately $55\circ$ where $Oe$ is the ether oxygen.