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New half-sandwich complexes of iron and tungsten carbonyl fragments with tetrahydropentalenyl ligands were synthesized, their stereochemistry determined and several ligand transformations performed in order to demonstrate the ability of these groups to control the relative stereochemistry of complex formation. The ligands L1 and L2 are derived from the diastereomerically pure (rac)-cis-1-methyl-3-phenyl-tetrahydropentalene (1) and (rac)-1,1-dimethyl-3-(2-methoxyphenyl)tetrahydropentalene (2). The following iron complexes were synthesized: [(L1)(CO)2Fe]2 (3), [(L2)(CO)2Fe]2 (4), Na[Fe(Co)2(L1)] (5), Na[Fe(CO)2(L2)] (6), (L1)(CO)2FeC(O)CH3 (7) and (L2)(CO)2FeC(O)CH3 (8). The following were obtained as tungsten complexes: (L1)(CO)3WX [X = H (9), Cl (10)], (L2)(CO)3WH (11) and Li[W(CO)3(L1)] (12). In the case of 10, one diastereoisomer could be separated; in the case of the acetyl complexes 7 and 8, both diastereoisomers have been isolated in the pure state. |
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