Computed Properties of C6H10O3. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: Methyl tetrahydrofuran-2-carboxylate, is researched, Molecular C6H10O3, CAS is 37443-42-8, about Low Temperature Chlorine-Initiated Oxidation of Small-Chain Methyl Esters: Quantification of Chain-Terminating HO2-Elimination Channels. Author is Muller, Giel; Scheer, Adam; Osborn, David L.; Taatjes, Craig A.; Meloni, Giovanni.
Cl-initiated oxidation reactions of three small-chain Me esters, Me propanoate (CH3CH2COOCH3; MP), Me butanoate (CH3CH2CH2COOCH3; MB), and Me valerate (CH3CH2CH2CH2COOCH3; MV), are studied at 1 or 8 Torr and 550 and 650 K. Products are monitored as a function of mass, time, and photoionization energy using multiplexed photoionization mass spectrometry coupled to tunable synchrotron photoionization radiation. Pulsed photolysis of mol. chlorine is the source of Cl radicals, which remove an H atom from the ester, forming a free radical. In each case, after addition of O2 to the initial radicals, chain-terminating HO2-elimination reactions are observed to be important. Branching ratios among competing HO2-elimination channels are determined via absolute photoionization spectra of the unsaturated Me ester coproducts. At 550 K, HO2-elimination is observed to be selective, resulting in nearly exclusive production of the conjugated Me ester coproducts, Me propenoate, methyl-2-butenoate, and methyl-2-pentenoate, resp. However, in MV, upon raising the temperature to 650 K, other HO2-elimination pathways are observed that yield Me 3-pentenoate and Me 4-pentenoate. In each Me ester oxidation reaction, a peak is observed at a mass consistent with cyclic ether formation, indicating chain-propagating OH loss/ring formation pathways via QOOH intermediates. Evidence is observed for the participation of resonance-stabilized QOOH in the most prominent cyclic ether pathways. Stationary point energies for HO2-elimination pathways and select cyclic ether formation channels are calculated at the CBS-QB3 level of theory and assist in the assignment of reaction pathways and final products.
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