title: Bioactive chromenes from Rhyncholacis penicillata.
abstract: Investigation of the aerial parts of Rhyncholacis penicillata afforded the new chromenes, 7-hydroxy-6-(3-methylbutyryl)-5-oxymethyl-chromene (rhynchonin A) and 7-hydroxy-6-(2-methylbutyryl)-6-oxymethylchromene (rhynchonin B). Structures were elucidated by spectroscopic methods and independent synthesis. Rhynchonin A showed broad insecticidal, acaricidal and nematicidal potency including strong biological activity against Heliothis zea.
authors.affiliation: Universität des Saarlandes, Saarbrücken, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Burkhardt
authors.forename: H
authors.initials: H
authors.lastname: Becker
authors.forename: M
authors.initials: M
authors.lastname: Grubert
authors.forename: J
authors.initials: J
authors.lastname: Thomas
authors.forename: T
authors.initials: T
authors.lastname: Eicher
mesh_terms: D000818:Animals; D000969:Antinematodal Agents / Q000737:chemistry / Q000494:pharmacology*; D002839:Chromans / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D007306:Insecticides / Q000737:chemistry / Q000494:pharmacology*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D010944:Plants / Q000737:chemistry*; D013987:Ticks
chemical_list: D000969:Antinematodal Agents; D002839:Chromans; D007306:Insecticides; C092918:rhynchonin A; C092919:rhynchonin B