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ChemInform Abstract: 1,3-Dipolar Cycloadditions of (1Z,4R*,5R*)-4-Benzamido-3-oxo-5-phenylpyrazolidin-1-ium-2-ides to Ethyl Propiolate.

✍ Scribed by Lidija Pezdirc; Branko Stanovnik; Jurij Svete

Publisher
John Wiley and Sons
Year
2008
Weight
25 KB
Volume
39
Category
Article
ISSN
0931-7597

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The 5,5-dimethylpyrazolidin-3-one (4), prepared from ethyl 3-methylbut-2-enoate (3) and hydrazine hydrate, was treated with various substituted benzaldehydes 5a Β± i to give the corresponding (1Z)-1-(arylmethylidene)-5,5-dimethyl-3-oxopyrazolidin-1-ium-2-ide azomethine imines 6a Β± i. The 1,3-dipolar