Thus, pyrazoline derivatives convert by condensation to ?, ?-unsaturated ketones:
2.
For example, diazomethane generally adds to methyl acrylate to give 3-carboxyl pyrazoline.
3.
"' Pyrazoline "'is a heterocyclic chemical compound with the molecular formula C 3 H 6 N 2.
4.
The Piloty-Robinson reaction competes with the formation of pyrazoline when the reactant is an aliphatic azine derived from a ketone.
5.
In 1912, Kischner later applied the catalytic decomposition to pyrazoline bases and developed a versatile method for the preparation of substituted cyclopropanes by thermal decomposition of pyrazolines.
6.
With phenyldiazomethane as the reactant the regioselectivity is reversed and the reaction is extended even further by simple air organic oxidation of the 2-pyrazoline to the pyrazole.
7.
The actual process taking place is path A with elimination of HI to the diazo compound "'4 "'followed by a diazoalkane 1, 3-dipolar cycloaddition to the pyrazoline "'5 "'in 85 % yield.
8.
Ber . 1967, 100, 60 . ) Tetrazoles with amino or styryl groups that can be activated by UV light at 365 nm ( 365 does not damage cells ) react quickly ( so that the UV light does not have to be on for a long time, usually around 1 4 minutes ) to make fluorogenic pyrazoline products.
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