Switchable ethylene tri-/tetramerization with high activity: Subtle effect presented by backbone-substituent of carbon-bridged diphosphine ligands
The effect of backbone-substituent of carbon-bridged diphosphine ligands of the types {Ph2PCH(R)CH2PPh2} and {Ph 2PC(R)iCHPPh2} on the catalyst performance in ethylene oligomerization has been explore
Zhang, Jun,Wang, Xiao,Zhang, Xuejun,Wu, Weijie,Zhang, Gengtao,Xu, Sheng,Shi, Min
p. 2311 - 2317
(2013/10/22)
ETHYLENE TETRAMERIZATION CATALYST SYSTEMS AND METHOD FOR PREPARING 1-OCTENE USING THE SAME
Disclosed herein is a method of preparing 1-octene at high activity and high selectivity while stably maintaining reaction activity by tetramerizing ethylene using a chromium-based catalyst system comprising a transition metal or a transition metal precursor, a cocatalyst, and a P—C—C—P backbone structure ligand represented by (R1)(R2)P—(R5)CHCH(R6)—P(R3)(R4).
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Page/Page column 13
(2010/06/16)
Method for Producing Polyhydroxyalkanoates
The invention relates to a process for preparing polyhydroxyalkanoates by polymerization of lactones of the general formula I, where the substituents and the index n have the meanings given in the description, in the presence of at least one catalyst of the formula (II) LIMaXam, where the substituents and indices have the meanings given in the description. The invention further relates to poly-3-hydroxybutyrates which have a novel property profile and are obtainable for the first time by means of this process, and also biodegradable polyester mixtures based on these poly-3-hydroxybutyrates.
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(2009/05/28)
Preparation of organohalosilanes
When oganohalosilanes are prepared by charging a reactor with a contact mass containing a metallic silicon powder and a copper catalyst, and introducing an organohalide-containing gas into the reactor to effect the direct reaction, a poly(organo)phosphino compound is added to the contact mass. The invention is successful in producing organohalosilanes at a significantly improved production rate without reducing the selectivity of useful silane.
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(2008/06/13)
Preparation of vinylphosphines by means of free radical addition of diphenylphosphine to alkynes and allenes
Diphenylphosphine adds readily to alkynes and allenes under free radical conditions.Alkynes normally give E-vinylphosphines as the primary (kinetic) product, but Z-vinylphosphines are the main products isolated.Allenes generally give complex product mixtures in which the predominant components are vinyl phosphines formed via addition of the Ph2P. radical to the central carbon atom of the allene fragment.
Mitchell, Terence N.,Heesche, Kerstin
p. 163 - 170
(2007/10/02)
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