Monoterpenoids

Iridoid and megastigmane glycosides from Phlomis aurea

“…The 13 C NMR (Table 1) and 1 H NMR spectra of 3 showed the presence of a b-glucopyranosyl moiety from the signals at C 102.6 and H 4.9 (1H, d, J=6.0 Hz). The 13 C NMR together with DEPT mode measurement and H±H COSY revealed that the aglycone of compound 3 is (3S, 5S, 6R, 9R)-3-hydroxy-5,6-epoxy-b-ionol (Grayson, 1997). The attachment of the glucose moiety at C-9 of the aglycone was proved from the down®eld shift of this carbon to 75.3 when compared with closely similar megastigmanes (Otsuka et al, 1995).…”

Kinetic study of the thermal rearrangement of cis- and trans-2-pinanol

“…2-Pinanol can be synthesized from ␣-pinene and ␤-pinene [14] which are found in selected coniferous biomass [15] or in crude sulfate turpentine (CST) [16], a by-product of the paper industry. The catalytic hydrogenation of ␣-pinene yields mixtures of the diastereomers cis-pinane and trans-pinane with high stereoselectivity to the cis-hydrogenation product [17].…”

Loliolide - the most ubiquitous lactone

“…An important group among them are terpenoids (Grayson 1996, Grayson 1997, Grayson 2000, Molnár et al 2010, derived from terpenes. Terpenes are composed of interconnected isoprene particles (consisting of 5 carbon atoms) which results in the fact that these particles of terpenes are composed of 5, 10, 15, etc.…”