Synthesis and Auxinic Behavior of 3-Ethyl-2-isopropyl-3,5-dimethyl-1,4,2-diazaphosphorine 2-Oxide

Eugenia Făgădar-Cosma,a* Gheorghe Făgădar-Cosma,b and Maria Laichicic
a Institute of Chemistry –Timișoara of Romanian Academy, M. Viteazul Ave, No. 24, 300223-Timisoara, Romania, E-mail:
b “Politehnica” University, Chemistry Department, T. Lalescu Street, No. 2, 300223-Timisoara, Romania.
c Ministry of Agriculture, Forests and Rural Development, DADR - Timiș County Department, Libertății Square, No. 1, Timișoara, Romania.

Alkyldiclorophosphines, as strong reducing agents, react with ketones in concentrated hydrochloric acid solution, to give the oxygen transfer products, which can be used for preparing cyclic compounds. In this respect, the synthesis and characterization of a new heterocyclic compound, 3-ethyl-2-isopropyl-3,5-dimethyl-1,4,2-diazaphosphorine 2-oxide (4), by a multi-component reaction, was realized. The new obtained compound was characterized by elemental analysis, MS, GC, IR and 1H-NMR and it was subjected to biological tests on wheat by using different concentrations of the tested substance. The biometric measurements were judged in correlation with chlorophyll a and b development, so that the entire health of the plants can be monitored. The corroborated results showed that the compound has a very significantly stimulation effect on wheat, at the concentration of 50 ppm.

Key words: auxinic activity, phosphorus heterocycle, i-propyldichlorophosphine, chlorophyll a and b content, UV-vis spectrophotometry