Isomerization, fluorine exchange, and stereoselective synthesis of cis- and trans-F2TePh3Cl: application of the coordination model of reaction mechanisms

The stereoselective synthesis of cis- and trans-F 2 TePh 3 Cl (phenyl substituents adopt a mer arrangement) via 5-coordinate cations Ph 3 TeFCl + and is described. trans-F 2 TcPh 3 Cl isomerizes to the thermodynamically more stable cis isomer, and cis -F 2 TePh 3 Cl has non-equivalent fluorines whic...

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Bibliographic Details
Published in:Canadian journal of chemistry 1989-01, Vol.67 (1), p.71-75
Main Authors: Janzen, Alexander F, Jang, Meehae
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
Kinetics and mechanisms
Organic chemistry
Reactivity and mechanisms
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Summary:The stereoselective synthesis of cis- and trans-F 2 TePh 3 Cl (phenyl substituents adopt a mer arrangement) via 5-coordinate cations Ph 3 TeFCl + and is described. trans-F 2 TcPh 3 Cl isomerizes to the thermodynamically more stable cis isomer, and cis -F 2 TePh 3 Cl has non-equivalent fluorines which undergo stereoselective fluorine exchange, as confirmed by 19 F and l25 Te nmr spectroscopy. These results are consistent with an intermolecular mechanism of isomerization and fluorine exchange involving TeF bond cleavage.The coordination model of reaction mechanisms provides a unified description of stereochemical rearrangements, ligand exchange processes, and chemical reactions in these, and related, octahedral and trigonal bipyramidal compounds. Keywords: synthesis of cis- and trans-F 2 TcPh 3 Cl, isomerization of octahedral Te compounds, fluorine exchange in cis-F 2 TePh 3 Cl, synthesis of Ph 3 TeF, coordination model of reaction mechanisms.
ISSN:0008-4042
1480-3291
DOI:10.1139/v89-012