Regioselective 1,3-Dipolar Cycloadditions of (1Z)-1-(Arylmethylidene)-5,5-dimethyl-3-oxopyrazolidin-1-ium-2-ide Azomethine Imines to Acetylenic Dipolarophiles
Cvetka Turk , Jurij Svete
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http://dx.doi.org/10.1002/1522-2675(20010131)84:1<146::AID-HLCA146>3.0.CO;2-7