Rhodium-Catalyzed Linear Cross-Trimerization of Two Different Alkynes with an Alkene and Two Different Alkenes with an Alkyne
作者:Masayuki Kobayashi、Ken Tanaka
DOI:10.1002/chem.201200903
日期:2012.7.23
paths with rhodium: A cationic RhI/H8‐BINAPcomplex has been found to catalyze the linear cross‐trimerization of terminal alkynes, acetylenedicarboxylates, and acrylamides to give substituted trienes. The asymmetric linear cross‐trimerization, giving substituted chiral dienes, has also been achieved by using monosubstituted alkenes and (R)‐BINAP instead of terminal alkynes and H8‐BINAP (see scheme;
与铑的交叉路径:阳离子Rh I / H 8 ‐BINAP络合物可催化末端炔烃,乙炔二羧酸酯和丙烯酰胺的线性交叉三聚反应,生成取代的三烯。还可以通过使用单取代的烯烃和(R)-BINAP代替末端炔烃和H 8 -BINAP(参见方案; H 8 -BINAP = 2,2'-bis )来实现不对称线性交叉三聚,得到取代的手性二烯。(二苯基膦基)-5,5',6,6',7,7',8,8'-八氢-1,1'-联萘基; BINAP = 2,2'-双(二苯基膦基)-1,1'-联萘]]。
Some unusual reactivities in the SmI2-mediated reductive coupling of acrylamides and acrylates with imides
作者:Rolf H. Taaning、Karl B. Lindsay、Troels Skrydstrup
DOI:10.1016/j.tet.2009.10.089
日期:2009.12
A serendipitous discovery of some intra-molecular enolate addition reactions following a SmI2-mediated reductive cross-coupling between imides and electron-deficientolefins leading to some novel compounds was investigated to determine the generality of the protocol and the possible mechanistic pathways involved. This provided a Z-selective synthesis of γ-ketoenediamides in good yields, albeit as of
Nickel(I) complexes were generated in situ from Ni (PPh3)2Cl2 using activated iron and the complexes combined with N,N′-bis(4-fluorobenzylidene) ethane-1,2-diamine (BFBED) were then used as a catalyst for the 1,4-addition reaction of arylboronic acids to α,β-unsaturated substrates. The reaction proceeded to completion and did not require the addition of a base but the addition of potassium iodide is
Inverse latex of anionic polyelectrolytes in silicone oils; cosmetic use thereof
申请人:SOCIETE D'EXPLOITATION DE PRODUITS POUR LES
INDUSTRIES CHIMIQUES, S.E.P.P.I.C.
公开号:EP1932515A1
公开(公告)日:2008-06-18
Composition comprising an oil phase, an aqueous phase, at least one emulsifying system of water-in-oil (W/O) type, optionally at least one emulsifying system of oil-in-water (O/W) type, in the form of an inverse latex comprising from 10% to 80% by mass and preferably from 20% to 70% by mass and most preferably from 30% to 60% by mass, of a linear partially or totally salified anionic polyelectrolyte, with wherein in that said oil phase comprises a silicone oil or a mixture of silicone oils; its use to thicken and or to emulsify cosmetic, dermopharmaceutical or pharmaceutical compositions.
A process for converting an olefin having x carbon atoms into an olefin having x+1 carbon atoms wherein the process comprises the steps of: (i) reacting an olefin having x carbon atoms with carbon monoxide and hydrogen in the presence of a hydroformylation catalyst to produce an alcohol having x+1 carbon atoms, and (ii) dehydrating the alcohol produced in step (i) in the presence of a dehydration catalyst to produce an olefin having x+1 carbon atoms characterised in that the the hydroformylation catalyst used in step (i) is based on: (a) a source of cobalt, and (b) a ligand which contains phosphorus and nitrogen.