prov:value
| - Other suitable precursors can have the formulae (1) (CO)4ML or (2) M2[?????(??2:??4???C4R4](CO)6, wherein M is iron, ruthenium, or in formula (1) and L is a two-electron donor ligand and each R is H, halo, OH, alkyl, perfluoroalkyl, or aryl, as described in U.S. Pat. No. 5,376,849 (McCormick et al.).
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