Diastereoselectivity in chiral ruthenium complexes of bidentate bisphosphine monoxide ligands: Controlling epimerization in aldehyde complexes and 16-electron intermediates

Organometallics

Volumn 18, Issue 16, 1999, Pages 3096-3104

  Faller, J W ^a   Patel, Ben P ^a   Albrizzio, Mauricio A ^a   Curtis, Michael ^a  

^a YALE UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000030775     PISSN: 02767333     EISSN: None     Source Type: Journal    
DOI: 10.1021/om981053g     Document Type: Article

References (55)

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51. Ru, would average the methyls in 6, the presence of the stereogenic centers in the Me-, Ph-, and Bu-substituted ligands would not allow averaging of the environments and the isopropyl methyls and cymene aromatics would remain diastereotopic. As shown in 3, the methyl substituent in the backbone favors twisting of the phenyls, which creates a chiral environment close to the metal, even though the chiral center is remote. This results in cymene aromatic shifts ranging over 1.6 ppm and diastereotopic isopropyl methyls differing by 0.35 ppm. An unusual downfield shift of ∼1 ppm of one pair of phenyl protons to δ 8.86 is also indicative of the differential interaction of the nonequivalent phenyls.
52. 17 however, the higher acidity in the arene complexes may well promote O binding.
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