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A compound of carbon with an element more electropositive than itself, for example, CaC2, calcium carbide.
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Numerous studies with model compounds and woody species indicate that cell walls are cross-linked by the reaction of matrix components with lignin quinone methide intermediates which are formed by [beta]-O-4 coupling of monolignols (Koshijima and Watanabe, 2003).
Insecticidal Activity of Maytenus Species (Celastraceae) Nortriterpene Quinone Methides against Codling Moth, Cydia pomonella (L.) (Lepidoptera: Tortricidae).
Jones, "The metabolism and toxicity of quinones, quinonimines, quinone methides, and quinonethioethers," Current Drug Metabolism, vol.
This peak decreases with thermal aging time (Figure 11), while a new peak at 400 nm is formed simultaneously that is most likely related to decomposition products of the antioxidant, for example, the highly color-altering substituted quinone methides which absorb light in the range of 420-465 nm [31].
Redox processes surrounding quinone methides continue to be of contemporary interest [1-2].
This volume, part of a series structured to illustrate the widest range of literature on specific reactive intermediaries, illustrates the literature on quinone methides, quinone analogues in which carbonyl oxygens are replaced by methylene groups.
Previous chemical reports on this plant have detailed the isolation of friedelanes and triterpenoid quinone methides (Calzada et al., 1991).
Rietjens, "The regioselectivity of glutathione adduct formation with flavonoid quinone/quinone methides is pH-dependent," Chemical Research in Toxicology, vol.
These approaches will be taken: a) to increase selectivity by 1) screening of ligands against LTR G-4s to select the best hits among libraries of G-4 ligands; 2) conjugation of the most promising leads to modified nucleic acids complementing LTR G-4 loop/flanking regions, to deliver the drug to its target; b) to stabilize binding by conjugation of the ligands to 3) an alkylating/cleaving subunit, and 4) an activable moiety (such as quinone methides) that alkylates the target only once the drug has reached it.
The reaction is thought to proceed; firstly, the tannic acid increases the electrophilicity of carbonyl carbon of aromatic aldehyde that will enhance the rate of condensation with [beta]-naphthol, which leads to formation of ortho-quinone methides intermediate.
This phenomenon can be substantiated with the strong tendency of oxymethylene derivatives to exist in equilibrium with quinone methides [4].
The resol type phenolic resin prepared by the reaction of phenol and formaldehyde in alkaline conditions comprised complicated mixtures of mono- or polynuclear hydroxymethyl phenols (6, 7) and para-quinone methides (8).

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