Synthesis of fluorinated 3-hydrazino-1,2,4-triazino[5,6-b] indoles as novel herbicidal systems

A few fluorinated 3-hydrazino-1,2,4-triazino[5,6-b] indoles (5-8) have been synthesized and screened for their herbicidal effect. Treatment of 3-hydrazino-8H/8-fluoro-1,2,4-triazino[5,6-b] indoles (3 and 4) with fluorinated acyl derivatives (A and B) yielded the rich fluorine 1,2,4-triazino indole. Structure of the products have been established by elemental analysis and spectral measurements. The presence and position of fluorine atoms have been deduced from 19F NMR. The novel fluorinated hydrazino-1,2,4-triazino[5,6-b] indoles have been tested for post-emergent herbicidal activity against grass weed species and broadleaf weed species.