[C:1]1(/[CH:7]=[CH:8]/[CH2:9][CH2:10][CH2:11][C:12]#[C:13][C:14](=[O:16])[CH3:15])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1>ClCCCl>[CH2:9]1[C:8]2=[CH:7][C:1]3[C:6]([C:13]([C:14](=[O:16])[CH3:15])=[C:12]2[CH2:11][CH2:10]1)=[CH:5][CH:4]=[CH:3][CH:2]=3To a 0.5-2 mL microwave irradiation vial equipped with a stir bar was added enyne 5a (0.020 g, 0.094 mmol) in DCE (1.6 mL). The reaction was irradiated with stirring at 180° C. for 30 min until complete by TLC. The reaction turned golden in color. The reaction was then transferred to a vial, concentrated under reduced pressure, and dried under vacuum to yield naphthalene 6a as a black oil (0.020 g, quant.).
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