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Free Radical Reactions in β-Methyl-D-Galactopyranoside X-Irradiated at 77 K and Annealed to 320 K: An ESR/ENDOR Study

Tex Horning and William A. Bernhard
Radiation Research
Vol. 99, No. 2 (Aug., 1984), pp. 262-271
DOI: 10.2307/3576370
Stable URL: http://www.jstor.org/stable/3576370
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Free Radical Reactions in β-Methyl-D-Galactopyranoside X-Irradiated at 77 K and Annealed to 320 K: An ESR/ENDOR Study
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Abstract

X irradiation of β-methyl-D-galactopyranoside single crystals at 77 K leads to the trapping of at least three free radical products, two of which have been identified. The major free radical product is due to the loss of hydrogen from the methyl group giving a ${\rm CH}_{2}{\rm OR}$ radical. A minor product accounting for ∼8% of the spectral intensity, is an alkoxy radical centered at O4. The ${\rm CH}_{2}{\rm OR}$ radical decays at 200 K, two-thirds of the population leading to nonradical products via recombination and one-third of the population converting to a C3-centered, deprotonated, secondary, hydroxyalkyl radical (C3-dsHA). On warming to 300 K the C3-dsHA radical converts, with a stoichiometry of ∼1:1, to a radical characterized by an α and β hfc tensor. It is proposed that a C2-centered, secondary, alkyl radical (C2-sA) is formed via β-hydroxyl elimination by the C3-dsHA radical.

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