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Monolignols coniferyl

In gymnosperms, the primary lignin precursors are the two monolignols coniferyl and /7-coumaryl alcohols, while in angiosperms sinapyl alcohol is also a participant in... [Pg.247]

Neolignans are head-to-tail linked dimeric phenylpropanoids, i.e., a Cj-side chain of one monolignol (coniferyl alcohol) is linked to the aromatic nucleus of a second one. This may proceed via C-O-C linkages, e.g., 8.0.4 -type. A comprehensive review on neolignans was published by Gottlieb (1978). [Pg.322]

Lignin polymerization is a natural process initiated by the enzymatic oxidation of hydroxycinnamyl alcohols such as /)-coumaryl (CM), coniferyl (CF), and sinapyl alcohols (SN), which are known as monolignols (Scheme 2.20).60... [Pg.60]

Other monolignols formed during the dehydrogenation of coniferyl alcohol are conifer aldehyde (VII), trans- and m-ferulic acid (XV, XVI), vanillin (traces), and vanillic acid (traces). [Pg.18]

Figure 3-9. Biosynthesis of monolignols. The enzymes involved in this pathway are ( ) hydroxycinnamoyl-CoA shikimate/quinate hydroxy-cinnamoyl transferase, (b) p-coumaroyl-CoA 3 -hydroxylase (E.C. 1.14.14.1), (c) caffeoyl-CoA O-methy 1 Iranslerasc (E.C. 2.1.1.104), (d) cinnamoyl-CoA reductase (E.C. 1.2.1.44) (e) cinnamyl alcohol dehydrogenase (E.C. 1.1.1.195), (f) coniferyl aldehyde/coniferyl alcohol 5-hydroxylase (E.C. 1.14.13), (g) coniferaldehyde/coniferyl alcohol O-methyltransferase (E.C. 2.1.1.68). Figure 3-9. Biosynthesis of monolignols. The enzymes involved in this pathway are ( ) hydroxycinnamoyl-CoA shikimate/quinate hydroxy-cinnamoyl transferase, (b) p-coumaroyl-CoA 3 -hydroxylase (E.C. 1.14.14.1), (c) caffeoyl-CoA O-methy 1 Iranslerasc (E.C. 2.1.1.104), (d) cinnamoyl-CoA reductase (E.C. 1.2.1.44) (e) cinnamyl alcohol dehydrogenase (E.C. 1.1.1.195), (f) coniferyl aldehyde/coniferyl alcohol 5-hydroxylase (E.C. 1.14.13), (g) coniferaldehyde/coniferyl alcohol O-methyltransferase (E.C. 2.1.1.68).
Figure 1 Monolignols structure of coniferyl alcohol (a), sinapil alcohol (b), and cu-marol alcohol (c). Figure 1 Monolignols structure of coniferyl alcohol (a), sinapil alcohol (b), and cu-marol alcohol (c).
Morelli E, Rej RN, Just G, Lewis NG, Towers GHN (1986) The occurrence of cis-monolignols in Fagus grandifolia Phytochemistry 25 1701-1705 Mortimer RD (1982) The formation of coniferyl alcohol during alkaline delignification J Wood Chem Technol 2 383-415... [Pg.566]

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Coniferyl

Monolignols

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