68718-85-4Relevant academic research and scientific papers
Phosphorus-containing podands 11. Synthesis of bis(ortho-diphenylphosphinyl)benzyl ethers of oligoethylene glycols and their complexing properties with respect to alkali metal cations
Bovin, A. N.,Evreinov, V. I.,Safronova, Z. V.,Tsvetkov, E. N.
, p. 912 - 916 (1993)
A number of monopodands having o-diphenylphosphinyl terminal groups were synthesized by alkylating sodium derivatives of oligoethylene glycols with o-(bromomethyl)phenyldiphenylphosphine.The stability constants of the complexes of these ligands with alkal
Phosphinoyl-aziridines as a new class of chiral catalysts for enantioselective Michael addition
Wujkowska, Zuzanna,Zawisza, Anna,Le?niak, Stanis?aw,Rachwalski, Micha?
, p. 230 - 235 (2018/12/05)
A series of new optically pure phosphine oxides containing chiral aziridine subunit were synthesized in good yields and applied as organocatalysts in asymmetric Michael reaction of various aliphatic aldehydes with β-nitrostyrene. The corresponding organoc
NOVEL CERIUM COMPLEX, AND LIGHT EMITTING MATERIAL
-
, (2019/10/01)
PROBLEM TO BE SOLVED: To provide a novel cerium carbene complex suitable for LED phosphors, organic EL emission layer materials, wavelength conversion materials for solar cells, and wavelength conversion materials for agriculture facility, and a method of producing the same. SOLUTION: The present invention provides a cerium complex with trivalent cerium coordinated with a carbene compound; particularly, a cerium complex in which the carbene compound coordinated to trivalent cerium being represented by formula (1). (R1, R2, R3, R4, R5, R6, R7, R8, R9, R10 each represent a hydrogen atom, or a C1-20 hydrocarbon group, or a hydrocarbon group containing an oxygen atom or a phosphorus atom, where they may be bound to each other, to form a ring. R11, R12 each represent a hydrogen atom or a C1-20 hydrocarbon group, where they may be bound to each other, to form a ring. x is an integer of 0 to 10). SELECTED DRAWING: None COPYRIGHT: (C)2019,JPOandINPIT
Efficient asymmetric synthesis of structurally diverse p-stereogenic phosphinamides for catalyst design
Han, Zhengxu S.,Zhang, Li,Xu, Yibo,Sieber, Joshua D.,Marsini, Maurice A.,Li, Zhibin,Reeves, Jonathan T.,Fandrick, Keith R.,Patel, Nitinchandra D.,Desrosiers, Jean-Nicolas,Qu, Bo,Chen, Anji,Rudzinski, Diandra M.,Samankumara, Lalith P.,Ma, Shengli,Grinberg, Nelu,Roschangar, Frank,Yee, Nathan K.,Wang, Guijun,Song, Jinhua J.,Senanayake, Chris H.
, p. 5474 - 5477 (2015/04/27)
The use of chiral phosphinamides is relatively unexplored because of the lack of a general method for the synthesis. Reported herein is the development of a general, efficient, and highly enantioselective method for the synthesis of structurally diverse P-stereogenic phosphinamides. The method relies on nucleophilic substitution of a chiral phosphinate derived from the versatile chiral phosphinyl transfer agent 1,3,2-benzoxazaphosphinine-2-oxide. These chiral phosphinamides were utilized for the first synthesis of readily tunable P-stereogenic Lewis base organocatalysts, which were used successfully for highly enantioselective catalysis.
A tandem olefin migration and Prins cyclization using Cu(OTf) 2-bisphosphine complexes: An improved synthesis of functionalized tetrahydropyrans
Ghosh, Arun K.,Nicponski, Daniel R.,Kass, Jorden
supporting information; experimental part, p. 3699 - 3702 (2012/09/21)
In situ-generated (bis-DPPMB)-Cu(OTf)2 complex has been examined to catalyze a tandem olefin migration and Prins cyclization of an alkenol with various aldehydes. The reaction proceeded with electron-rich aromatic aldehydes at room temperature
Triaryl phosphine-functionalized N-heterocyclic carbene ligands for Heck reaction
Wang, Ai-E,Xie, Jian-Hua,Wang, Li-Xin,Zhou, Qi-Lin
, p. 259 - 266 (2007/10/03)
A new type of triaryl phosphine-functionalized imidazolium salts 6 were prepared. Their palladium complexes, generated in situ, were successfully applied in the palladium-catalyzed Heck reaction. Using 1 mol% of Pd(dba) 2 and 1 mol% 6c in the presence of 2 equiv of K2CO 3 in DMAc has proven to be highly efficient for the coupling of a wide array of aryl bromides and iodides with acrylates in excellent yield. The coupling of 4-bromotoluene with various styrene derivatives catalyzed by Pd/6c complex also gave good results. Graphical Abstract.
Diastereoselective hydroformylation of 2-substituted allylic o-DPPB-Esters-On the origin of 1,2-asymmetric induction
Breit, Bernhard,Heckmann, Golo,Zahn, Stephan K.
, p. 425 - 434 (2007/10/03)
2-Substituted secondary alcohol o-DPPB esters (o-DPPB = orthodiphenylphosphanylbenzoyl) have been prepared and their o-DPPB-directed diastereoselective hydroformylation examined. It was found that the diastereoselectivity increased as a function of the steric demand of the substituents both at the stereogenic center and in the alkene 2-position. Hydrolytic cleavage of the o-DPPB group afforded - via the lactols 29 - the corresponding lactones 30, the relative configurations of the vicinal stereogenic centers of which were ascertainable by 2D-NOESY spectroscopy. In addition, a crystal structure analysis of the hydroformylation product 2d provided further confirmation of the relative configuration. Replacement of the ester carbonyl group of the o-DPPB by a methylene unit resulted in significantly worse diastereoselectivity in the course of the hydroformylation (34→35), which indicates a decisive role for the ester carbonyl function. All the experimental observations were combined in a model of the origin of the 1,2-asymmetric induction during the title reaction. The key feature is the consideration of diastereomeric trigonal-bipyramidal rhodium-hydrido-olefin complexes I and II, capable on the basis of the Hammond postulate of acting as good models for the transition states of the selectivity-determining hydrometalation step. Investigation of these complexes by force-field methods indicated good correlation between theoretically predicted and experimentally determined diastereoselectivities.
Studies on a Chiral (N,P) Ligand Containing a C2-Symmetric Aziridine Unit
Tanner, David,Wyatt, Paul,Johansson, Fredrik,Bertilsson, Sophie K.,Andersson, Pher G.
, p. 263 - 268 (2007/10/03)
As part of a program on the use of chiral aziridines in asymmetric synthesis and catalysis, the enantiopure (N,P) ligand 1, consisting of a C2-symmetric chiral aziridine and a triarylphosphine unit, was prepared. The synthesis was convergent and efficient, proceeding in five steps and 37% overall yield from 2-bromotoluene. The ligand was designed (a) for a study of the asymmetric Pd-catalyzed allylic substitution reaction, (b) in an attempt to obtain a measure of the trans effect of phosphorus relative to an aziridine nitrogen, and (c) to compare its performance with the corresponding chiral phosphinooxazoline species (computational studies having indicated certain similarities between the two ligand types). However, the new aziridine species did not provide levels of enantioselectivity comparable to those obtained with the phosphinooxazoline analogs, and our results serve to underline once more the difficulties associated with the rational design of ligands for asymmetric catalysis.
Synthesis, Characterisation and Structure of Square-planar Palladium(II) Complexes with Phosphine-Pyridine Hybrid Ligands o-Ph2PC6H4CH2O(CH2)nC5H4N-2 (n = 1-3). Isolation of the First Transition-metal Complex with a trans-Chelating Bidentate PN Ligand
Tani, Kazuhide,Yabuta, Masami,Nakamura, Shingo,Yamagata, Tsuneaki
, p. 2781 - 2790 (2007/10/02)
The reaction of Na2 or with an equimolar amount of new bidentate hybrid ligands having a P and a N donor atom capable of trans chelation, o-Ph2PC6H4CH2O(CH2)nC5H4N-2 (n = 1-3), gave mainly the 1:1 complex PdCl2o-Ph2PC6H4CH2O(CH2)nC
