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Enantioselective Cycloisomerization of 1,6-Enynes Catalyzed by Chiral Diphosphane–Palladium Complexes

✍ Scribed by Dr. Andreas Goeke; Ryoichi Kuwano; Prof. Dr. Yoshihiko Ito; Dr. Masaya Sawamura

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
279 KB
Volume
35
Category
Article
ISSN
0044-8249

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✦ Synopsis

TbtCHSe, 4 was prepared by the reaction of TbtCHN, [9] with (C,H,),TiSe,[li~ in the presence of a catalytic amount of CuCl at room temperature. 4 was obtained as an inseparable mixture of compounds with different numbers of selenium atoms. the average number of which was determined to be 5.1 by elemental analysis. A. Shaver, J. M. McCall, Organomerol/ics 1984. 3. 1823. Compound 7 gradually decomposes to TbtCHO and MesNCSe at room temperature. S. Watanabe, T. Kawashirna, R. Okazaki. unpublished results. The structures of l a and Ib in solution were determined by ' H ( ' H i nuclear Overhauser effect (NOE) experiments, !he results of which were similar to those for TbtCHS[8]. For rotational isomerization of sterically congested.

📜 SIMILAR VOLUMES

Chlorinative Cyclization of 1,6-Enynes b
Chlorinative Cyclization of 1,6-Enynes by Enantioselective Palladium(II)/Palladium(IV) Catalysis
✍ Kazuhiro Takenaka; Shintaro Hashimoto; Shinobu Takizawa; Hiroaki Sasai 📂 Article 📅 2011 🏛 John Wiley and Sons 🌐 English ⚖ 195 KB

## Abstract A novel asymmetric catalysis __via__ a palladium(II)/palladium(IV) cycle has been developed by utilizing a chiral spiro bis(isoxazoline) ligand (SPRIX). Intramolecular chlorinative cyclization of 1,6‐enynes catalyzed by a palladium‐SPRIX complex proceeded enantioselectively to afford α‐