Limonoids of calamondin seeds |
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| Authors: | RD Bennett S Hasegawa |
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| Institution: | Fruit and Vegetable Chemistry Laboratory, Science and Education Administration, U.S. Department of Agriculture, Pasadena CA 91106, U.S.A. |
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| Abstract: | Five new limonoids were isolated from calamondin seeds: methyl deacetylnomilinate (7), calamin (9), retrocalamin (10), cyclocalamin (11), and methyl isoobacunoate diosphenol (13). Structures were assigned on the basis of 1H and 13CNMR spectra, and chemical conversions of 9 to 10, 11, and 13. These reactions are also biogenetically plausible. Both 11 and the structurally similar limonoid rutaevin have been assigned the 5β-H configuration, which is opposite to that of all other known Rutaceae limonoids. 13CNMR data are presented for 15 limonoids. |
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