Molekularna struktura i auksinska aktivnost 2-alkilindol-3-octenih kiselina

Translated title of the contribution: Molecular structure and auxin activity of 2-alkyl-indole-3-acetic acids

Snjezana Antolic, Eduard Dolusic, Biserka Kojic-Prodic, Erika Kozic, Volker Magnus

Research output: Contribution to conferencePoster


In general, the auxin activity of indole-3-acetic acid decreases gradually when alkyl substituents of increasing chain length are attached to its ring-carbons. Only for the 2-position, Kögl and Kostermans (Hoppe Seyler's Z. physiol. Chem. 235, 201, 1935) claimed that any substituent larger than a methyl group rendered the molecule inactive. We showed, however, that the '2-ethylindole-3-acetic acid' they used in their experiments is, in reality, 3-methylindole-2-propionic acid. The proper 2-ethylindole-3-acetic acid and its 2-propyl homologue were prepared by a different route and characterized by NMR spectroscopy and X-ray crystallography. Both compounds showed auxin activity in the Avena coleoptile-section straight-growth test, with dose-response curves similar to those of 2-methylindole-3-acetic acid, i. e. not quite as high as for co-assayed indole-3-acetic acid and shifted by about one order of magnitude towards higher concentrations.
Translated title of the contributionMolecular structure and auxin activity of 2-alkyl-indole-3-acetic acids
Original languageOther
PagesZbornik sazetaka priopcenja Sedmog hrvatskog bioloskog kongresa, Hvar, Hrvatska, 24.09-29.09.2000, pp. 91-91
Publication statusPublished - 2000
EventSedmi hrvatski bioloski kongres - Hvar, Croatia
Duration: 24 Sep 200029 Sep 2000


ConferenceSedmi hrvatski bioloski kongres

Fingerprint Dive into the research topics of 'Molecular structure and auxin activity of 2-alkyl-indole-3-acetic acids'. Together they form a unique fingerprint.

Cite this