Detail of "580-72-3"

Reference

Hydrogenolysis of protolignin

Hydrogenolysis of protolignin. XIII. Isolation of trimeric biphenyl and lignan type compounds. Sudo, Kenichi; Sakakibara, Akira (Gov. Forest Exp. Stn., Tokyo, Japan). Mokuzai Gakkaishi, 23(3), 151-5 (English) 1977. CODEN: MKZGA7. DOCUMENT TYPE: Journal CA Section: 43 (Cellulose, Lignin, Paper, and Other Wood Products) The compd. I [63015-85-0] and matairesinol [580-72-3] were isolated from hydrogenolysis products of wood (Picea jezoensis) and identified by IR, UV, NMR, and mass spectroscopy. To know the behavior of the lactone ring in hydrogenolysis, .alpha.-conidendrin [518-55-8] as model was subjected to hydrogenolysis which resulted in the isolation of .beta.-conidendrin [5474-93-1], 6-hydroxy-4-(4-hydroxy-3-methoxyphenyl)-7-methox-hexahydronaphtho[ 2,3-c]furan [63015-84-9] and 7-hydroxy-1-(4-hydroxy-3-methoxyphenyl)-2,3-bis(hydroxymethyl)-6-met hoxy-1,2,3,4-tetrahydronaphthalene [5234-71-9].

Secondary lignification in conifer trees

Secondary lignification in conifer trees. Hergert, Herbert L. (ITT Rayonier Inc., New York, N. Y., USA). ACS Symp. Ser., 48(Cellul. Chem. Technol., Symp.), 227-43 (English) 1977. CODEN: ACSMC8. DOCUMENT TYPE: Journal CA Section: 43 (Cellulose, Lignin, Paper, and Other Wood Products) Serial anal. of softwood and bark show that Brauns' native lignin (I) [8068-01-7] is mainly biosynthesized during heartwood and outer bark formation and is located in parenchyma cells, pit torii, and the fiber lumen. A corresponding insol. fraction (0.2-5% in heartwood and 10-30% in outer bark), determinable as Klason lignin [8068-04-0], co-occurs with I. It, too, is mainly formed at the sapwood-heartwood boundary by secondary lignification (author's term). While these secondary lignins are structurally similar to primary wood lignin, they show measurable variations because of the incorporation of species-dependent phenols, e.g., matairesinol [580-72-3] (hemlock), plicatic acid [16462-65-0] (cedar), or sugiresinol [2141-07-3] (redwood) into the polymer. Since heartwood contains these secondary lignin polymers with copolymerized lignans, should not be used for primary lignin structural studies, in pulping, or wood treating.