Synthesis of (±)-Abscisin II

Effects of Abscisin II and Other Plant Growth Substances on Germination of Seeds with Stratification Requirements

“…Embryos from stratified F. almericana were somewhat more sensitive and still gave 80 % inhibition with 0.3 uM DL-abscisin II. The trans, trans-isomer of DL-abscisin II was considerably less effective, a result similar to that obtained by Cornforth et al (2) …”

“…Abscisin II has no activity as an atlxin or gibberellin, but can counteract the action of these hormones in Arena coleoptiles, in the barley endosperm assay and in the growth of dwarf maize or dwarf peas (1, 7). DLAbscisin II and the DL-trans, trans isomer have been synthesized (2) When DL-abscisin II was added to embryos immediately after removal from the seeds, inhibition of germination of all nondormant embryos was observed. There were no signs of injury even when germination was inhibited 100 %.…”

Synthesis and Biological Activity of Benzaldehyde O-Alkyloximes as Abscisic Acid Mimics (Part 1)

“…However, its high cost resulting from difficult syntheses in low yields makes wide use impractical. 7) Moreover, it is too unstable for practical use in plants and in the environment due to its rapid metabolism and photoisomerization. 8 ,9) A series of investigations has been carried out to find stable and active ABA analogs and to elucidate their structure-activity relationship.…”

Abscisic Acid Analogs with a Geometrically Rigid Conjugated Acid Side-chain

“…It is conceivable that compound 13 would be more lipophilic than ABA itself and that it would structurally resemble both ABA and lunularic acid 5. 7 ) A priori, the target 90mpound maybe obtained by sensitized photo-oxygenation 8 ) of the polyenoic acid 9. The latter, in turn, may be synthesized in one step by condensation of safranal 9 ) with an appropriate Wittig-Horner reagent such as diethyl (2-ethoxycarbonyl)-benzyl phosphonate (bp 147 -150°Cj0.1 mm).…”