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note
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Depending on how the reactions are worked up and the length of time the compounds spend in the air on the column, one can get differing amounts of pyrazolines and pyrazoles. For example, rapid chromatography of the reaction mixture shown in Scheme 5 allows the isolation of only the pyrazolines 6a and 6b without any pyrazole 4c being formed. In the reactions shown in Scheme 3, the compounds were left on the column for a longer period of time and therefore more of the pyrazoles were formed.
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