Síntese de reguladores de crescimento De plantas derivados de naftaleno

Abstract

Plant Growth Regulators (PGRs) are chemical compounds involved in various processes of growth and development of plants in general, and food crops in particular. They are, therefore, chemical agents of great agricultural importance, however, little used in Mozambique. These compounds stimulate the growth of plants, either by inhibition or by intensification of certain biological activities exerted by the plant hormones that the plant produces during the normal cycle of your life. 5 groups of PGRs are classically known: auxins, gibberellins, cytokinins, abscisic acid and ethylene. The main objective of this work is to study the synthesis and analyze the properties plant growth regulator chemicals (PGRs) derived from naphthalene of general formula 1; where where A can be methylene group (-CH 2 -), or ether (-O-CH 2 -) while R can be the oxydryl group (-OH), amino (-NH 2) or ether (-O-CH 3 or -O-C 2 H 5). These were selected from the remaining classes of PGRs for having biological activities of great interest for the improvement of agriculture Mozambican, because they have relatively simple structures, and because there are synthesis techniques relatively simple and less expensive. O (THE) Ç R As a result, α-naphthylacetic acid (A = CH 2, R = OH and the carbon-linked chain) was prepared 1 of naphthalene) through two classic routes (a) reaction of naphthalene with chloroacetic acid and b) a Grignard reaction), selected based on the availability of material and reagents. You yields obtained by these routes are: 1.5% by the reaction of naphthalene with chloroacetic acid and 59.4% by the Grignard reaction. 2-naphthoxyacetic acid (A = -O-CH 2 - and R = - OH) and its derivative, potassium 2-naphthoxyacetate (A = -O-CH 2 - and R = -O - K +), by the synthesis of Williamson, using β-naphthol and chloroacetic acid as reagents in the presence of hydroxide potassium; having obtained about 59.4% of yield. The reaction products were purified using the recrystallization technique and their purity was controlled by thin layer chromatography (TLC). Structural confirmation was made through proton nuclear magnetic resonance spectroscopy (1 H NMR) and infrared (IV).