Abstract
Two labdane diterpenoids, labda-7,12(E),14-triene-17-oic acid (1) and labda-12(Z),14,17-triene-18-oic acid (2), C20H30O2, have been isolated from Croton oblongifolius. Both 1 and 2 crystallized in the monoclinic system, space group C2, with cell dimensions of a = 21.912(1) Å, b = 7.4002(4) Å, c = 11.5079(7) Å, β = 101.999(1)o and a = 21.308(2) Å, b = 11.9067(9) Å, c = 7.5606(6) Å, β = 100.763(1)o, respectively. Compound 1, a rare example of carboxylic group bound to a cyclohexene ring, forms an infinite intermolecular hydrogen-bonded polymer [O1 ⋅ ⋅ ⋅ O2(−x + 1/2, y + 1/2, −z + 2) 2.697(2) Å], whereas molecules of compound 2 are linked to form an asymmetric hydrogen-bonded dimer [O1 ⋅ ⋅ ⋅ O2(−x, y, −z) 2.657(3) Å].
Similar content being viewed by others
References
Roengsumran, S.; Petsom, A.; Kuptiyanuwat, N.; Vilaivan, T.; Ngamrojnavanich, N.; Chaichantipyuth, C.; Phuthong, S. Phytochemistry 2001, 56, 103–107.
Roengsumran, S.; Petsom, A.; Sommit, D.; Vilaivan, T. Phytochemistry 1999, 50, 449–453.
Pattamadilok, D.; M. Sc. Thesis in Pharmacy, Chulalongkorn University, Bangkok, Thailand, 1998.
Ohno, N.; Gershenzon, J.; Neuman, P.; Mabry, T. J. Phytochemistry 1981, 20, 2393–2396.
Bevan, C.W.; Ekong, D.E.; Okogun S.I. J. Chem. Soc. 1961, 1063.
Su, W.C.; Fang, J.M.; Cheng, Y.S. Phytochemistry 1995, 41, 255–261.
Lee, G.H.; Lin. C.; Cheng Y.S.; Peng, S.M. Acta. Crystallogr., Sect. C 1987, 43, 1382–1384.
Sheldrick, G.M. SHELXL-97; University ofGöttingen: Germany, 1997.
Allen, F.H.; Kennard, O. Chem. Des. Auto. News 1993, 8, 31.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Roegsumran, S., Jaiboon, N., Chaichit, N. et al. Hydrogen bonding in labdane diterpenoids, labda-7,12(E),14-triene-17-oic acid and labda-12(Z),14,17-triene-18-oic acid. Journal of Chemical Crystallography 32, 511–517 (2002). https://doi.org/10.1023/A:1021157112711
Issue Date:
DOI: https://doi.org/10.1023/A:1021157112711