157-26-6Relevant articles and documents
The Ozonolysis of Ethylene. Microwave Spectrum, Molecular Structure, and Dipole Moment of Ethylene Primary Ozonide (1,2,3-Trioxolane)
Gillies, J. Z.,Gillies, C. W.,Suenram, R. D.,Lovas, F. J.
, p. 7991 - 7999 (2007/10/02)
The gas-phase structure of ethylene primary ozonide (CH2CH2OOO) has been determined from millimeter wave spectra of five isotopic species.Partial substitution, rs, parameters for the lowest energy oxygen envelope conformation (Cs symmetry) are r(CC) = 1.546(3) angstroem, r(CO) = 1.417(10) angstroem, r(OO) = 1.453(10) angstroem, r(CHendo) = 1.088(5) angstroem, r(CHexo) = 1.095(5) angstroem, θ(CCO) = 103.9(2) deg, θ(COO) = 102.1(4) deg, θ(OOO) = 100.1(12) deg, and θ(HCH) = 111.6(3) deg.The electric dipole moment of the normal isotopic species is 3.43(4) D.Two vibrational states, 98(6) and 171(18) cm-1 above the ground state, have been assigned to successive excitations of the pseudorotational mode which corresponds to a ring-twisting vibration of the five-membered ring.The barrier to pseudorotation is estimated to be high (greater than 300 to 400 cm-1) in agreement with ab inito MO calculations.Ethylene primary ozonide, dioxirane (CH2OO), formaldehyde, and ethylene secondary ozonide (CH2OCH2OO) are observed as products of the ozone-ethylene reaction in the low-temperature microwave cell. A mechanism of the ozonolysis of ethylene is presented which suggests that the reaction occurs primarily in the condensed phase on the surface of the cell.Microwave techniques utilizing cis- and trans-CHD=CHD show that ozone adds stereospecifically to ethylene in the formation of ethylene primary ozonide.
