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THE SYNTHESIS OF PYRROLO<1,2-a>PYRAZIN-1(2H)-ONES AND PYRROLO<1,2-b>PYRIDAZIN-6(5H)-ONES
The pyrrolo<1,2-a>pyrazin-1(2H)-ones (10), (11), (12) and (13) and the pyrrolo<1,2-b>pyridazin-6(5H)-one (18) were prepared either a) directly by Chichibabin quaternisation-cyclisation of the corresponding methoxymethylpyrazine or pyridazine or b) by hydrogen halide hydrolysis of methoxypyrrolo<1,2-a>pyrazines and methoxypyrrolo<1,2-b>pyridazines.Protonation studies and some reactivity of the systems are discussed.
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Pyridazine – Wikipedia,
Pyridazine | C4H4N679 – PubChem