Abstract
The structures of the (benzene dialkylacetal)tricarbonyl chromium complexes [η6-C6H5-CH(OR)2]Cr(CO)6 (R=Me,1; Et,2), are reported. The compounds were examined as part of a study of the conformations of the tripodal tricarbonylchromium group. For [η6-C6H5-CH(OMe)2]Cr(CO)3,1, monoclinic,P21/c (# 14),a=15.235(1) Å,b=6.5304(5) Å,c=12.702 Å, β=103.197(1)o,Z=4. For [η6-C6H5-CH(OEt)2]Cr(CO)3,2, monoclinic,P21/c (# 14),a=9.859(3) Å,b=10.547(3) Å,c=15.138(3) Å, β=108.42(2)o,Z=4. The data show that the molecules adopt the expected “three-legged piano stool” structure. The carbonyl ligands in1 adopt an eclipsed arrangement with respect to the arene ring and its substituent, while those in2 are staggered. These conformations are consistent with the notion that the acetal substituent behaves largely as an electroneutral group, or at most as a weak electronic acceptor.
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The τ angle for1 is the torsion angle C9-Centroid-Cr-C2, while for2 it is C9-Centroid-Cr−Cl.
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Gilbert, T.M., Bauer, C.B. & Rogers, R.D. Structures of 355-1355-1355-1tricarbonyl: structural evidence for the near-electroneutrality of the dialkylacetal substituent. J Chem Crystallogr 26, 355–360 (1996). https://doi.org/10.1007/BF01677100
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DOI: https://doi.org/10.1007/BF01677100