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Conditions: acetal 1 (0.1 mmol), alkyne 2a (1.5 equiv), MgBr2·OEt2 (1.2 equiv), K2CO3 (1.0 equiv), solvent (0.5 mL), 60 °C, 24 h. Average isolated yields from duplicate experiments (±2%). E:Z ratios of isolated product mixtures determined by 1H NMR spectroscopy. a 0.2 mmol scale.
