Volume 54, Issue 23 pp. 6913-6917
Communication

Rhodium-Catalyzed Hydroformylation of 1,1-Disubstituted Allenes Employing the Self-Assembling 6-DPPon System

Alexander Köpfer

Alexander Köpfer

Institut für Organische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79104 Freiburg im Breisgau (Germany)

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Prof. Dr. Bernhard Breit

Corresponding Author

Prof. Dr. Bernhard Breit

Institut für Organische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79104 Freiburg im Breisgau (Germany)

Institut für Organische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79104 Freiburg im Breisgau (Germany)Search for more papers by this author
First published: 27 April 2015
Citations: 34

This work was supported by the DFG, the International Research, Training Group “Catalysts and Catalytic Reactions for Organic, Synthesis” (IRTG 1038), the Fonds der Chemischen Industrie, and the Krupp Foundation. We thank Umicore, BASF, and Wacker for generous gifts of chemicals. Sonka Zeyner is acknowledged for highly motivated and skillful technical assistance.

Graphical Abstract

β,γ-Unsaturated aldehydes are obtained by a rhodium-catalyzed hydroformylation of 1,1-disubstituted allenes. For unsymmetrically 1,1-disubstituted allenes the Z-configured product is formed in up to about 95 % selectivity. This is the first time that these building blocks are accessible by hydroformylation of allenes. The utility of this methodology is demonstrated by further transformations of one of the obtained products.

Abstract

A rhodium-catalyzed hydroformylation of 1,1-disubstituted allenes is reported. Using a RhI/6-DPPon catalyst system, one can obtain β,γ-unsaturated aldehydes in high regio- and chemoselectivity. The Z-configured product is formed with up to >95 % selectivity when unsymmetrically 1,1-disubstituted allenes are submitted to the reaction conditions. This is the first time that these interesting building blocks are accessible by hydroformylation of allenes. The utility of this methodology is demonstrated by further transformations of one of the obtained products.

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