Synthesis, Characterization, and Applicability of Neutral Polyhydroxy Phospholane Derivatives and Their Rhodium(I) Complexes for Reactions in Organic and Aqueous Media
摘要:
Two different protocols for the preparation of water-soluble, enantiomerically pure polyhydroxybisphospholanes from acid-labile acetal and tert-butyldimethylsilyl-protected derivatives are reported. These procedures circumvent two of the commonly encountered limitations in the synthesis of these potentially important ligands: (a) formation of phosphonium salts from the highly basic phosphine under acidic conditions, and (b) the need to start with preformed, fully protected cationic metal complex. Thus, cationic Rh complexes of these ligands have been prepared in a separate step, and they have been found to be excellent catalysts for organic and aqueous phase hydrogenation of dehydroamino acids. The viability of catalyst recovery has been demonstrated in three different systems, including two cases where > 99% ee can be achieved under recycling conditions.
The invention relates to oligomerization of olefins, such as ethylene, to higher olefins, such as a mixture of 1-hexene and 1-octene, using a catalyst system that comprises a) a source of chromium b) one or more activators and c) a phosphacycle-containing ligating compound. Additionally, the invention relates to a phosphacycle-containing ligating compound and a process for making said compound.
本发明涉及使用催化剂体系将烯烃(如乙烯)低聚为高碳烯烃(如 1-己烯和 1-辛烯的混合物),该催化剂体系包括 a) 铬源 b) 一种或多种活化剂和 c) 含磷环连接化合物。此外,本发明还涉及一种含磷环的连接化合物和制造所述化合物的工艺。
Process for oligomerization
申请人:Dow Global Technologies LLC
公开号:US10376869B2
公开(公告)日:2019-08-13
The invention relates to oligomerization of olefins, such as ethylene, to higher olefins, such as a mixture of 1-hexene and 1-octene, using a catalyst system that comprises a) a source of chromium b) one or more activators and c) a phosphacycle-containing ligating compound. Additionally, the invention relates to a phosphacycle-containing ligating compound and a process for making said compound.
本发明涉及使用催化剂体系将烯烃(如乙烯)低聚为高碳烯烃(如 1-己烯和 1-辛烯的混合物),该催化剂体系包括 a) 铬源 b) 一种或多种活化剂和 c) 含磷环连接化合物。此外,本发明还涉及一种含磷环的连接化合物和制造所述化合物的工艺。
CHROMIUM COMPLEX AND CATALYST THEREFROM
申请人:Dow Global Technologies LLC
公开号:US20180071725A1
公开(公告)日:2018-03-15
The invention relates to oligomerization of olefins, such as ethylene, to higher olefins, such as a mixture of 1-hexene and 1-octene, using a catalyst system that comprises a) a source of chromium b) one or more activators and c) a phosphacycle-containing ligating compound. Additionally, the invention relates to a phosphacycle-containing ligating compound and a process for making said compound.
PROCESS FOR OLIGOMERIZATION
申请人:Dow Global Technologies LLC
公开号:US20180154344A1
公开(公告)日:2018-06-07
The invention relates to oligomerization of olefins, such as ethylene, to higher olefins, such as a mixture of 1-hexene and 1-octene, using a catalyst system that comprises a) a source of chromium b) one or more activators and c) a phosphacycle-containing ligating compound. Additionally, the invention relates to a phosphacycle-containing ligating compound and a process for making said compound.
Highly Flexible Synthetic Routes to Functionalized Phospholanes from Carbohydrates
作者:Yuan-Yong Yan、T. V. RajanBabu
DOI:10.1021/jo991762j
日期:2000.2.1
Highly functionalized phospholanes 15, 17, and 26 and the corresponding diastereomers in which the configurations of the phospholane carbon-2 and carbon-5 are inverted can be readily prepared from d-mannitol by displacement of the appropriate dimesylate or cyclic sulfate with dilithiumphosphide reagents. The diols from which these ligands are prepared can also be converted into diarylphosphinite ligands