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Data · collection · 2015

Studies on the photochemical oxidation of N , N -diacyl-1,4-dihydropyrazine derivatives

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The photochemical oxidation of N,N -diacyl-1,4-dihydropyrazines was investigated by irradiation from a medium-pressure mercury lamp.

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The main products of the photooxygenation were isolated and unambiguously confirmed by 1 H NMR spectra, 13 C NMR spectra, H-H, C-H correlation spectra, high-resolution mass spectrometry, and single-crystal x-ray diffraction analysis. The complicated NMR spectra of main products were studied by variable-temperature NMR experiments.

The mechanism of the photooxygenation of N,N -diacyl-1,4-dihydropyrazines is suggested to be a [2 + 2] cycloaddition of oxygen to the double bond.

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Mass spectrometry 75%

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