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a) DA2 of benzopyrone 3 and benzyne (1). b) DA2 of alkylpyrone 29 and cyclohexyne (23). c) DA2 of alkylpyrone 29 with benzyne (1). d) DA2 of benzopyrone 3 and cyclohexyne (23). e) D/IAS analysis of analogous geometries for DA2 shown in Figure 4b–4d. Geom = analogous geometry.
