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Volumn 135, Issue 41, 2013, Pages 15595-15608

Mechanistic basis for high stereoselectivity and broad substrate scope in the (salen)Co(III)-catalyzed hydrolytic kinetic resolution

Author keywords

[No Author keywords available]

Indexed keywords

ABSOLUTE STEREOCHEMISTRY; COMPUTATIONAL ANALYSIS; COMPUTATIONAL STUDIES; HIGH STEREOSELECTIVITIES; HYDROLYTIC KINETIC RESOLUTION; RATE OF HYDROLYSIS; STEREOCHEMICAL COMMUNICATION; TRANSITION STRUCTURES;

EID: 84886905672     PISSN: 00027863     EISSN: 15205126     Source Type: Journal    
DOI: 10.1021/ja408027p     Document Type: Article
Times cited : (110)

References (98)
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    • In contrast, little deviation from planarity is observed in crystal structures of (salen)Mn(III) complexes
    • In contrast, little deviation from planarity is observed in crystal structures of (salen)Mn(III) complexes: Pospisil, P. J.; Carsten, D. H.; Jacobsen, E. N. Chem.-Eur. J. 1996, 2, 974-980
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  • 47
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    • In a series of elegant studies, Fox and co-workers have shown that the match between the sense of helical chirality in a metal-salen complex and the absolute stereochemistry of the diamine backbone can be overturned in the context of (salen)Ni(II) metallofoldamers by introducing stereogenic end-groups at the salicylidene 3-position (ref 21). While Fox's work raises the possibility that a similar phenomenon might occur in (salen)Co(III) structures, i.e., that diastereomeric complexes (P,S,S)- and (M,S,S)- 1b could both be present in HKR reaction mixtures, an examination of the crystal structures of the (salen)Ni(II)-derived metallofoldamers reveals a conformation of the salen ligand that is distinct from that of the (salen)Co(III) step structures that are the focus here. In the (salen)Ni(II) structures, the ligand appears to be twisted out of planarity into a helix, as opposed to adopting the salen step. Indeed, a crystal structure of (salen)Ni(II) complexes with the same ligand as in complexes 1 reveals no salen step; instead, the ligand takes on a slight twist (see: Shimazaki, Y.; Tani, F.; Fukui, K.; Naruta, Y.; Yamauchi, O. J. Am. Chem. Soc. 2003, 125, 10512-10513). For the purpose of our analysis of (salen)Co(III) complexes, we make the assumption that there is only a single energetically accessible diastereomer of 1b, with the step absolute stereochemistry matched to the diamine absolute stereochemistry
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    • For a compilation of crystal structures of (salen)metal complexes, see: Ph.D. Thesis, Harvard University, Cambridge, MA, November; Appendix 1. The complete text of this document is available via the Internet through Proquest.
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    • The effect is illustrated in a dramatic way by the fact that hexaaminecobalt(III) chloride can be purified by recrystallization from concentrated hydrochloric acid in high yield
    • The effect is illustrated in a dramatic way by the fact that hexaaminecobalt(III) chloride can be purified by recrystallization from concentrated hydrochloric acid in high yield: Bjerrum, J.; McReynolds, J. P. Inorg. Synth. 1946, 2, 216-221
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.