Title of article
Asymmetric Isomerisation of a Cyclic Diene: a Comparative Study of BINAP and BIPNOR–Rhodium(I) Catalysts
Author/Authors
Thomas Faitg، نويسنده , , Josette Soulié، نويسنده , , Jean-Yves Lallemand، نويسنده , , François Mercier، نويسنده , , François Mathey، نويسنده ,
Issue Information
هفته نامه با شماره پیاپی سال 2000
Pages
4
From page
101
To page
104
Abstract
The asymmetric isomerisation of 5,7-dibenzyloxy-6-(trialkylsilyloxy)cyclohepta-1,3-diene 1 to the corresponding 1,6-dibenzyloxy-7-(trialkylsilyloxy)cyclohepta-1,3-diene 2 can be accomplished at 90°C in a 75/25 mixture of toluene and DME in the presence of a [Rh(BIPNOR)(cod)]+ catalyst with 92% ee. A much lower ee is observed with BINAP. In both cases, the observed eeʹs increase with temperature. A mechanism involving an η5-pentadienyl–rhodium complex is proposed.
Keywords
asymmetric isomerisation , Enantiomeric excess , cyclic dienes
Journal title
Tetrahedron
Serial Year
2000
Journal title
Tetrahedron
Record number
1080467
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