DOI:
10.1055/s-00000084
Synthesis
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References
Only one other successful example for engaging 1a in a (4+3) cycloaddition was with a cyclopropanone, although the yield was not reported: Turro NJ, Edelson SS, Williams JR, Darling TR, Hammond WB.
J. Am. Chem. Soc. 1969;
91: 2283
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