title: Tropos or atropos nature of rhodium complexes bearing a tetrakis(phosphanyl)terphenyl ligand: highly enantioselective catalysis of ene-type cyclization.
abstract: [reaction and structure: see text] Not only axial but also helical chirality of tropos TETRAPHOS-Rh complexes can be controlled by chiral diamines. The flexibility of the TETRAPHOS-Rh complex is increased by association of DABN. In contrast, the diamine-free complex is chirally more stable than the BIPHEP counterpart. The higher levels of enantioselectivity in ene-type cyclization of 1,6-enynes can thus be achieved even at room temperature by the diamine-free TETRAPHOS-Rh complex.
authors.affiliation: Department of Applied Chemistry, Tokyo Institute of Technology, Tokyo 152-8552, Japan. kmikami@o.cc.titech.ac.jp
authors.forename: Koichi
authors.initials: K
authors.lastname: Mikami
authors.forename: Shohei
authors.initials: S
authors.lastname: Kataoka
authors.forename: Kohsuke
authors.initials: K
authors.lastname: Aikawa