Synthesis of new beta-(1,3-benzothiazole-2-)phosphoric hydrazides

beta-(1,3-Benzothiazole-2-)phosphoric hydrazides 2 were synthesized by Athe rton-Tod method using potassium carbonate as a base in the presence of tetr abutylammonium bromide as a phase transfer catalyst or by the intermolecula r condensation of the hydrazines 1 with phosphorochloridate, ((RO)-O-3)((RO )-O-4)P(O)Cl, in the presence of a base, triethylamine. Thermal decompositi on at 180 degrees C of 2a caused the intramolecular shift of ethyl group fr om oxygen to beta -nitrogen atom, and formed the monoester phosphoric hydra zide 3, whose structure was determined by elementary analysis, IR, H-1 NMR, C-13 NMR, P-31 NMR, MS spectra. The biological activity of the title produ ct was also tested and some of them showed good fungicidal activity.