The Leaf, Wood and Bark Oils of three Species of Myodocarpus (Myodocarpaceae) Endemic to New Caledonia

摘要

The leaf, wood and bark oils of three species of Myodocarpus, M viellardii Brongn. & Gris, M fraxinifolius Brongn. & Gris and M. lanceolatus Dubard & R. Viguier have been examined. From the wood oil of M. viellardii the major components were a-pinene (22.4%) and a monoterpene methyl ester, methyl myodocarpate (methyl 3,7-dimethylbicyclo [4,1,0]hept-3-ene-7-carboxylate) (61%), based on the delta-3-carene skeleton. Also present in lesser amounts was the corresponding acid, myodocarpic acid (3,7-dimethylbicyclo[4,1,0]hept-3-ene-7-carboxilic acid) and the corresponding alcohol, myodocarpol (3,7-dimethylbicyclo[4,1,0]hept-3-en-7-yl) methanol), in lesser (<3%) amounts. The bark oil contained beta-caryophyllene (13.8%) and a series of long chain fatty alcohols, dodecanol, tetradecanol, hexadecanol, octadecanol and octadec-9-en-1-ol in amounts of 1.4-15% (all but octadecanol >11%). The leaf oil of this species produced a sesquiterpenic oil with the principal components being beta-caryophyllene (36%), alpha-humulene (11.1%) and bicyclogermacrene (10.6%). In M fraxinifolius, both the wood and bark oils contained a series of long chain alcohols, tetradecanol (30-38%), hexadecanol (23-29%) and octadec-9-en-1-ol (12%) as principal components. In the leaf oil of this species the principal component was beta-caryophyllene (63%), with lesser amounts of humulene oxide 11 (2.9%), isocomene (2.8%) and viridiflorol (1.4%). In M. lanceolatus, the leaf oil was dominated by the monoterpene hydrocarbons alpha-pinene (22.9%) and delta-3-carene (32.6%). In the wood oil of this species the principal components were geraniol (7.4%), citronellol (4.7%), germacrene-B (7.1%), zingiberine (6.8%) and linalool (6.7%), while in the bark oil they were geraniol (12.4%), citronellol (2.6%), germacrene-B (5.8%), and linalool (6.5%).