NORLIGNAN FROM THE KNOT RESIN OF ARAUCARIA ANGUSTIFOLIA

A new norlignan, 2,3-bis-(p-hydroxyphenyl)-2-cyclopentene-1-one, was isolated from the knot resin powder of Araucaria angustifolia. The structure was elucidated by spectroscopic chemical analyses. In addition 4,4'-dihydroxychalcone, cryptoresinol (norlignan), four known lignans and one known norlignan, were isolated for the first time from the resin. A qualitative and quantitative comparison of these compounds in knot, heartwood and sapwood of A. angustifolia was performed from the viewpoint of plant chemistry. Detectable amounts of the new compound were present in both knot and heartwood.