Journal of the Brazilian Chemical Society
On-line version ISSN 1678-4790
RUBINGER, Mayura M. M. et al. Preparation, X-ray structural studies and plant growth regulatory activity of methyl 6a,7b-thiocarbonyldioxyvouacapan-17 b-oate. J. Braz. Chem. Soc. [online]. 2004, vol.15, n.2, pp. 219-223. ISSN 1678-4790. http://dx.doi.org/10.1590/S0103-50532004000200010.
The 6a,7b-dihydroxyvouacapan-17b-oic acid (1) and methyl 6a,7b-dihydroxyvouacapan-17b-oate (2) are natural products isolated from the hexane extract of Pterodon polygalaeflorus Benth fruits. Here we describe the preparation and characterization by infrared and nuclear magnetic resonance spectroscopy, and by elemental analysis of the novel derivative methyl 6a,7b-thiocarbonyldioxyvouacapan-17b-oate (5), from the ester 2. The structure of compound 5 was determined by X-ray diffraction. At the concentration of 100 ppm, this compound inhibited the radicle growth of Sorgum bicolor L. (-28%) and showed no significant effect on Cucumis sativus L..
Keywords : Vouacapane derivatives; plant growth regulation; crystal structure determination.