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Blue-shift of the C-H stretching vibration in CHF3-H2O complex: Matrix isolation infrared spectroscopy and ab initio computations. Chem Phys 2016. [DOI: 10.1016/j.chemphys.2016.07.016] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Biegasiewicz KF, Ingalsbe ML, St. Denis JD, Gleason JL, Ho J, Coote ML, Savage GP, Priefer R. Evaluation of a chiral cubane-based Schiff base ligand in asymmetric catalysis reactions. Beilstein J Org Chem 2012; 8:1814-8. [PMID: 23209516 PMCID: PMC3511016 DOI: 10.3762/bjoc.8.207] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2012] [Accepted: 09/19/2012] [Indexed: 11/27/2022] Open
Abstract
Recently, a novel chiral cubane-based Schiff base ligand was reported to yield modest enantioselectivity in the Henry reaction. To further explore the utility of this ligand in other asymmetric organic transformations, we evaluated its stereoselectivity in cyclopropanation and Michael addition reactions. Although there was no increase in stereocontrol, upon computational evaluation using both M06L and B3LYP calculations, it was revealed that a pseudo six-membered ring exists, through H-bonding of a cubyl hydrogen to the copper core. This decreases the steric bulk above the copper center and limits the asymmetric control with this ligand.
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Affiliation(s)
- Kyle F Biegasiewicz
- Department of Chemistry, Biochemistry, and Physics, Niagara University, NY 14109, USA
| | - Michelle L Ingalsbe
- Department of Chemistry, Biochemistry, and Physics, Niagara University, NY 14109, USA
| | | | - James L Gleason
- Department of Chemistry, McGill University, Montreal, QC, H3A 2K6, Canada
| | - Junming Ho
- ARC Centre of Excellence for Free-Radical Chemistry and Biotechnology, Research School of Chemistry, Australian National University, Canberra ACT 0200, Australia
| | - Michelle L Coote
- ARC Centre of Excellence for Free-Radical Chemistry and Biotechnology, Research School of Chemistry, Australian National University, Canberra ACT 0200, Australia
| | - G Paul Savage
- CSIRO Materials Science and Engineering, Clayton South MDC 3169, Australia
| | - Ronny Priefer
- Department of Chemistry, Biochemistry, and Physics, Niagara University, NY 14109, USA
- College of Pharmacy, Western New England University, Springfield, MA 01119, USA
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Affiliation(s)
- Ronny Priefer
- a Department of Chemistry , Biochemistry and Physics, Niagara University , Niagara Falls, NY, 14109, USA
| | - Eric Martineau
- a Department of Chemistry , Biochemistry and Physics, Niagara University , Niagara Falls, NY, 14109, USA
| | - David N. Harpp
- b Department of Chemistry , McGill University , Montréal, Québec, Canada , H3A 2K6
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