Phosphabarrelenes as Ligands in Rhodium-Catalyzed Hydroformylation of Internal Alkenes Essentially Free of Alkene Isomerization

Authors

  • Evelyn Fuchs Dr.,

    1. Chemisches Laboratorium, Institut für Organische Chemie und Biochemie, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79104 Freiburg i. Brsg., Germany, Fax: (+49) 761-203-8715
    Search for more papers by this author
  • Manfred Keller Dr.,

    1. Chemisches Laboratorium, Institut für Organische Chemie und Biochemie, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79104 Freiburg i. Brsg., Germany, Fax: (+49) 761-203-8715
    Search for more papers by this author
    • X-ray crystal structure analyses of 5 b and 5 c.

  • Bernhard Breit Prof. Dr.

    1. Chemisches Laboratorium, Institut für Organische Chemie und Biochemie, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79104 Freiburg i. Brsg., Germany, Fax: (+49) 761-203-8715
    Search for more papers by this author

Abstract

Despite significant research efforts in the past, one of the remaining problems to be solved in industrially important hydroformylation is the chemoselective low-pressure hydroformylation of internal alkenes. We report here on a new class of phosphabarrelene/rhodium catalysts 2 that display very high activity towards hydroformylation of internal alkenes with an unusually low tendency towards alkene isomerization. Preparation of new phosphabarrelene ligands, studies of their coordination properties, as well as results obtained in the rhodium-catalyzed hydroformylation of cyclic and acyclic internal alkenes are reported.

Ancillary