Constituents of the essential oil ofSolidago gigantea Ait. (giant goldenrod)

The hydrodistilled essential oil of aerial parts of S. gigantea was investigated by GC, GC–MS and NMR spectroscopy. Two samples (1990/91, Warsaw, and 1998, Łódź) yielding 0.55% and 70% of essential oil, were analysed in 1992 and 1998. Ninety constituents (96% of the total oil) were identified in the first sample and 85 (98%) in the second. α-Pinene (7.0/4.1%), myrcene (2.5/2.6%), p-cymene (2.2/0.6%), (−)-bornyl acetate (4.4/2.9%), α- (6.1/4.0%) and γ-gurjunene (2.5/2.1%) (−)-germacrene D (21.6/23.5%), (−)-ledol (1.2/2.1%), eudesma-4(15),7-dien-1β-ol (1.9/2.5%) and (−)-cyclocolorenone (8.1/32.4%) are the main constituents. The structures of three new sesquiterpenes were established by NMR data: epi-torilenol (5αH, 6βH, 7αH, 8βH, 10α-6,8-cycloeudesm-4(15)-en-lα-ol, 0.4/0.1%), 1,10-seco-eudesma-4(15),5(10)-dien-1-al (0.9%/trace) and cis-eudesm-4(10)-en-1-one (0.2%/trace).