Synthesis p. 134 - 137 (1987)
Update date:2022-07-31
Topics:
Schmidt, Arthur H.
Maibaum, Harry
Starting with squaric acid (1), semisquaric acid (4) has been synthesized in a 54percent overall yield.In contrast to a literature report semisquaric acid (4) reacts with ammonia (5a) and aniline (5b) in the cold to give the ammonium-semisquarates 6a and
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