Abstract
At 500°C, flash vacuum pyrolysis of (η 5-C 5H 5) 2Fe 2(CO) 4 provides a rapid, practical synthesis of the tetranuclear complex (η 5-C 5H 5) 4Fe 4(μ 3-CO) 4: at higher temperatures, ferrocene is formed. Ferrocene itself undergoes little change under flash vacuum pyrolysis conditions, even at 725°C. Pivaloylferrocene is unchanged at 650°C but cracks to yield isobutene between 675 and 700°C; this reaction does not proceed by simple elimination since formylferrocene can be recovered unchanged under flash vacuum pyrolysis conditions which give substantial quantities of isobutene from pivaloylferrocene.
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