265ChemInform Abstract Mononuclear bis-and tris(ethylene)Ru complexes can be generated photochemically starting with (I) in alkanes as shown in the scheme. The photochemistry of Fe(CO)4(C2H4) is the same as that of (II) except that trans-Fe(CO)2(C2H4)3 could only be detected by IR spectroscopy at temp. below 210 K. The new results show that species previously formulated as Fe2(CO)6(alkene)2 are in fact Fe(CO)3(alkene)2. In solution, the bis-and tris(ethylene) complexes are substitutionally labile and may serve as versatile reagents in preparative chemistry. Addition of deoxygenated 1-pentene results in rapid catalytic isomerization at 293 K to a mixture of 2-pentenes, thus establishing the viability of both M(CO)3 and M(CO)2 species as repeating units in the catalytic alkene isomerization.
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