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KETENACETALE ALS DIENOPHILE: REAKTIVITAET UND REGIOSPEZIFITAET BEI (4+2)-CYCLOADDITIONEN MIT INVERSEM ELEKTRONENBEDARF.
Mueller, K.,Sauer, J.
, p. 2541 - 2544 (1984)
Ketene acetales 3a-3e differ in reactivity by 5-6 powers of ten in the reaction with monoaryl tetrazines 1a-1e.While 3a-3d yield "ortho-adducts" 4 almost exclusively, the ketene-N,N-acetale 3e gives both regioisomers 4 and 5, the isomer ratio is depending
