1
0 mL of dioxane, Co
2
(CO)
8
(15 mg, 30 mol%) was added. The
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reaction mixture was heated at 110 1C for 20 h. The reaction mixture
was then filtered over a silica gel pad. The filtrate was concentrated
and purified by silica gel column chromatography using 10–20% ethyl
acetate in hexane as eluent to obtain pure compound 5 as a white solid.
Yield: 50 mg, 62%.
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