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Regio- and Stereoselective Ring-Opening Reactions of Chiral Substituted Spiro[2.4]hepta-4,6-dienes:  A New, Simple, and Versatile Approach to the Synthesis of Optically Active Bidentate Cyclopentadienyl−Phosphine Ligands. X-ray Crystal Structure of (S)-[Rh(η2-C2H4)(η5-C5H4CH2CHPhPPh2P)]

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journal contribution
posted on 11.05.2000, 00:00 by Santiago Ciruelos, Ulli Englert, Albrecht Salzer, Carsten Bolm, Astrid Maischak
The ring-opening reaction of (S)-1-phenylspiro[2,4]hepta-4,6-diene with LiPPh2 proceeds with full regio- and stereoselectivity, taking place at phenyl-substituted carbon and with complete inversion of the configuration at the stereogenic center, yielding (S)-[Li(C5H4CH2CHPhPPh2)]. Optically active complexes of rhenium, rhodium, zirconium, and iron with this new chiral bidentate ligand have been prepared; additionally, the X-ray crystal structure of (S)-[Rh(η2-C2H4)(η5-C5H4CH2CHPhPPh2P)] is reported.