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CAS indexed 95 chemical substances from this document.
CAS subject entries for this document include: Arylation catalysts; Alkylation catalysts; Resolution (separation); and 18 additional concepts. | |
CAPLUS COPYRIGHT 2004 ACS on STN
| TITLE:
| Preparation of chiral phosphorus cyclic compounds for transition metal-catalyzed asymmetric reactions |
| INVENTOR(S):
| Zhang, Xumu |
| PATENT ASSIGNEE(S):
| The Penn State Research Foundation, USA |
| SOURCE:
| U.S. Pat. Appl. Publ., 15 pp. CODEN: USXXCO |
| LANGUAGE:
| English |
PATENT INFORMATION: PATENT NO. KIND DATE APPLICATION NO. DATE
--------------- ---- -------- --------------- --------
US 2004072680 A1 20040415 US 2003-423485 20030425
ABSTRACT:
Prepn. of chiral phospholanes, e.g. I, having biaryl chirality for applications in asym. catalysis are provided. A series of new chiral mono- or bidentate phosphorus ligands were efficiently prepd. through a key intermediate (S)-4-chloro-4,5-dihydro-3H-4-phosphacyclohepta[2,1-a;3,4-a']binaphthalene and its derivs. These ligands were complexed with transition metals to prep. catalysts, which were used in asym. catalytic reactions, such as, asym. hydrogenation, hydride transfer, allylic alkylation, hydrosilylation, hydroboration, hydrovinylation, hydroformylation, olefin metathesis, hydrocarboxylation, isomerization, cyclopropanation, Diels-Alder reaction, Heck reaction, isomerization, Aldol reaction, Michael addn.; epoxidn., kinetic resoln. or [m + n] cycloaddn. wherein m = 3 to 6 and n = 2.
Updated 5/8/2007 10:20:12 AM
