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Affiliation(s)
- John D. Roberts
- Crellin Laboratory of Chemistry, California Institute of Technology, Pasadena, California 91125
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Shtarev AB, Pinkhassik E, Levin MD, Stibor I, Michl J. Partially bridge-fluorinated dimethyl bicyclo[1.1.1]pentane-1,3-dicarboxylates: preparation and NMR spectra. J Am Chem Soc 2001; 123:3484-92. [PMID: 11472120 DOI: 10.1021/ja0000495] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Direct fluorination of dimethyl bicyclo[1.1.1]pentane-1,3-dicarboxylate, obtained from [1.1.1]propellane prepared by an improved synthetic procedure, furnished esters of 14 of the 15 possible bridge-fluorinated bicyclo[1.1.1]pentane-1,3-dicarboxylic acids, isolated by preparative GC. Calculated geometries reflect the substitution pattern in a regular fashion compatible with Bent's rules. Considerable additional strain is introduced into the bicyclo[1.1.1]pentane cage by polyfluorination; it is calculated to be as high as 33-35 kcal/mol for hexasubstitution. Three arrangements of the fluorine substituents are especially strain-rich: geminal, proximate, and W-related. The (1)H, (13)C, and (19)F NMR spectra exhibit a striking variety of chemical shifts and long-range coupling constants. These are in good agreement with results calculated with neglect of the bridgehead substituents for all of the chemical shifts by the GIAO-RHF/6-31G//RHF/6-31G and GIAO-RHF/6-31G//MP2/6-31G methods and for many of the coupling constants by the EOM-CCSD/6-311G//MP2/6-311G method. The proximate (4)J(FF) constants are particularly large (50-100 Hz) and show an inverse linear dependence on the calculated F-F distance in the range 2.43-2.58 A.
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Affiliation(s)
- A B Shtarev
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309-0215, USA
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3
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Levin MD, Hamrock SJ, Kaszynski P, Shtarev AB, Levina GA, Noll BC, Ashley ME, Newmark R, Moore GGI, Michl J. Preparation, Structure, and Properties of Symmetrically 1,3-Difunctionalized Penta- and Hexafluorobicyclo[1.1.1]pentanes. J Am Chem Soc 1997. [DOI: 10.1021/ja9710518] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michael D. Levin
- Contribution from the Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, and 3M Company, Saint Paul, Minnesota 55144
| | - Steven J. Hamrock
- Contribution from the Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, and 3M Company, Saint Paul, Minnesota 55144
| | - Piotr Kaszynski
- Contribution from the Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, and 3M Company, Saint Paul, Minnesota 55144
| | - Alexander B. Shtarev
- Contribution from the Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, and 3M Company, Saint Paul, Minnesota 55144
| | - Galina A. Levina
- Contribution from the Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, and 3M Company, Saint Paul, Minnesota 55144
| | - Bruce C. Noll
- Contribution from the Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, and 3M Company, Saint Paul, Minnesota 55144
| | - Martin E. Ashley
- Contribution from the Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, and 3M Company, Saint Paul, Minnesota 55144
| | - Richard Newmark
- Contribution from the Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, and 3M Company, Saint Paul, Minnesota 55144
| | - George G. I. Moore
- Contribution from the Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, and 3M Company, Saint Paul, Minnesota 55144
| | - Josef Michl
- Contribution from the Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, and 3M Company, Saint Paul, Minnesota 55144
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4
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Static and Dynamic Stereochemistry of Alkyl and Analogous Groups. ADVANCES IN PHYSICAL ORGANIC CHEMISTRY 1989. [DOI: 10.1016/s0065-3160(08)60018-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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NMR spectra of molecules containing CF2 groups III fluorinated cyclo-butenes and cyclo-butanes, with special reference to the signs of 3JFF. ACTA ACUST UNITED AC 1969. [DOI: 10.1016/0022-2364(69)90074-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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