Synthesis, characterization and correlative biological effects in wheat of a benzoxaza- and a diaza-phosphorus(V) heterocycles

Dichloro-p-tolylphosphine, involved in a Mannich type reaction, together with o-aminophenol or 1,2- diaminopropane and acetone generated two phospho- rin-2-oxide ring compounds, namely: hexahydro-3,3,5-trimethyl-2-p-tolyl-1,4,2-di- azaphosphorine-2-oxide and 3,4-dihydro-3,3-dimethyl-2-p-tolyl-2H-1,4,2-benzoxa- za-phosphorine-2-oxide. The two compounds were fully characterized by MS, IR, UV, 1 H-NMR, and gas chromatography. Another main objective of the present study was to examine to what extent the treatments with different concentrations of the above-mentioned diaza- and benzoxaza-compounds affected the content of leaf chlorophyll of a monocotyledonous plant (wheat), in correlation with all the other changes concerning the general development of the tested plants.