title: Chromone studies. Part 13. Synthesis and electron-impact mass spectrometric studies of 5-hydroxy-2-isopropyl-7-methoxychromone, a constituent of the medicinal plant Baeckea frutescens, and side-chain analogues.
abstract: 5-Hydroxy-2-isopropyl-7-methoxychromone (1d), a chromone constituent isolated from the aerial parts of Baeckea frutescens, and four analogues (1a-c and 1e), all of which exhibit toxicity to the brine shrimp Artemia salina, have been prepared from 2',4',6'-trihydroxyacetophenone. High-resolution mass spectrometric analysis has permitted elucidation of the fragmentation patterns exhibited by these systems following electron-impact ionization.
authors.affiliation: Department of Chemistry, Rhodes University, Grahamstown, 6140, South Africa.
authors.forename: Christopher A
authors.initials: CA
authors.lastname: Gray
authors.forename: Perry T
authors.initials: PT
authors.lastname: Kaye
authors.forename: Aloysius T
authors.initials: AT
authors.lastname: Nchinda
mesh_terms: D000818:Animals; D001156:Artemia / Q000187:drug effects*; D002867:Chromones / Q000138:chemical synthesis / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010946:Plants, Medicinal / Q000737:chemistry*
chemical_list: C479853:5-hydroxy-2-isopropyl-7-methoxychromone; D002867:Chromones