- Highly Active and Selective Ethylene Oligomerization Catalyst and Method of Preparing Hexene or Octene Using the Same
-
This invention relates to a chromium complex compound for selective ethylene oligomerization including a chiral ligand, and to a method of selectively preparing 1-hexene or 1-octene from ethylene using the same.
- -
-
Page/Page column 8
(2012/06/01)
-
- Ethylene oligomerization catalyst systems having enhanced selectivity
-
Disclosed herein is a catalyst system for selective oligomerization of ethylene, which comprises a P—C—C—P frame-work ligand, which is (R1)(R2)P—(R5)CHCH(R6)—P(R3)(R4), and a chromium-based metal compound. Also disclosed is a method of greatly enhancing the activity and selectivity of oligomerization, such as trimerization or tetramerization, using a ligand having a specific steric arrangement structure.
- -
-
Page/Page column 14
(2013/02/27)
-
- Synthesis of the chiral diphosphine ligand 2,3-bis(diphenylphosphino)butane (CHIRAPHOS)
-
A new synthesis of CHIRAPHOS starting from readily available 2,3-bis(diphenylphosphinyl)- 1,3-butadiene has been devised. The key step of the synthesis is the hydrogenation of the diene to rac-2,3-bis(diphenylphosphinyl)butane. This reduction can be conve
- Matteoli, Ugo,Beghetto, Valentina,Schiavon, Cristina,Scrivanti, Alberto,Menchi, Gloria
-
p. 1403 - 1409
(2007/10/03)
-
- A New Chiral Rhodium(I) Complex of (2R,3R)-2,3-Bis(diphenylphosphino)butane for Asymmetric Hydrogenations
-
Rhodium(I) complexes of the new chiral ligand (2R,3R)-2,3-bis(diphenylphosphino)butane (4) - which is easily prepared from natural tartaric acid - hydrogenate α-(acylamino)acrylic acids to natural (S)-acylamino acids in high chemical (95-100percent) and optical (80-100percent) yields.
- Koettner, Johann,Greber, Gerd
-
p. 2323 - 2325
(2007/10/02)
-
