3-(3{40 ,4{40 -Dichloro-6{40 -alkyl-phenyl)-delta, 2-pyrazoline derivatives

摘要

Novel pyrazolines are obtained by condensation of substituted propiophenones or vinyl-phenyl-ketones with substituted phenyl hydrazines. The products are useful as optical brighteners of a great variety of the shade of their fluorescence and of an improved fastness to light.