allylic hydrogen


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allylic hydrogen

[ə′lil·ik ′hī·drə·jən]
(organic chemistry)
In an organic molecule, a hydrogen attached to a carbon atom that is adjacent to a double bond.
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Those Type II coagents that contain extractable allylic hydrogen have been shown to participate in intramolecular cyclization reactions, as well as intermolecular propagation reactions (ref.
Transfer of allylic hydrogen as the antioxidant mechanism of diterpene lactone androgra-pholides.
Represented in figure 1 as di-functional (X-X), these compounds favor network formation through increased local concentrations of easily-abstractable allylic hydrogens or other very reactive sites of unsaturation.
Closely related to this is the number of allylic hydrogen atoms.