Palladium-catalyzed biaryl-coupling reaction of arylboronic acids in water using hydrophilic phosphine ligands
摘要:
Hydrophilic phosphine ligands possessing a carbohydrate side-chain, such as N-(4-diphenylphosphinophenyl)methyl gluconamide (9), N-[4-(2'-dicyclohexylphosphinobiphenyl)phenylmethyl] gluconamide (10), and N-[4-(2'-di-t-butylphosphinobiphenyl)]phenylmethyl gluconamide (11), were newly synthesized to carry out palladium-catalyzed biaryl coupling of arylboronic acids in a single aqueous medium. The catalyst prepared in situ from Pd(OAc)(2) and 10 exhibited a higher efficiency than that of 9, 11, Ph2P(m-C6H4SO3Na) (TPPMS) or P(m-C6H4SO3Na)(3) (TPPTS) for representative aryl bromides, chlorides, or triflates. The catalyst prepared in situ from Pd(OAc)(2) (0.001 mol%) and 10 (0.002 mol%) achieved 96,000 TON in the reaction of p-tolylboronic acid with 4-bromoacetophenone in water. (C) 2002 Elsevier Science Ltd. All rights reserved.
The Methoxycarbonylation of Vinyl Acetate Catalyzed by Palladium Complexes of [1,2-Phenylenebis(methylene)]bis[di(tert-butyl)phosphine]
作者:Adam J. Rucklidge、George E. Morris、Alexandra M. Z. Slawin、David J. Cole-Hamilton
DOI:10.1002/hlca.200690174
日期:2006.8
Palladium complexes of [1,2-phenylenebis(methylene)]bis[di(tert-butyl)phosphine] (1) catalyze the methoxycarbonylation of vinyl acetate (= ethenyl acetate) in the presence of methanesulfonic acid (Scheme 1). High selectivities to ester products can be obtained if free phosphine ligand is in excess over the amount of added acid (Table 1). Selectivities to methyl 2-acetoxypropanoate, a precursor to lactate
Carbonylation of ethylenically unsaturated compounds
申请人:Eastham Graham Ronald
公开号:US09334227B2
公开(公告)日:2016-05-10
A process for the carbonylation of ethylenically unsaturated compounds including vinyl esters and a process for the production of 3-hydroxy propanoate esters or acids. The process comprises reacting said compound with carbon monoxide in the presence of a source of hydroxyl groups and of a catalyst system. The catalyst system is obtainable by combining: (a) a metal of Group 8, 9 or 10 or a compound thereof: and (b) a bidentate ligand of general formula (I): X1(X2)-Q2-A-R—B-Q1-X3(X4).
A long-tethered (P–B–P)-pincer ligand: synthesis, complexation, and application to catalytic dehydrogenation of alkanes
作者:Enrique Huang Kwan、Yasushi Jack Kawai、Sei Kamakura、Makoto Yamashita
DOI:10.1039/c6dt02075e
日期:——
long-tethered boron-containing (P–B–P)-pincer ligand 8 has been synthesized. Complexation of 8 with [Ir(coe)2Cl]2 (coe = cyclooctene) resulted in (P–B–P)(hydrido)chloroiridium complex (P–B–P)Ir(H)Cl 9. Subsequent reaction with nBuLi led to the formation of dihydride complex (P–B–P)Ir(H)210. Both complexes were found to be moderately active for the catalytic dehydrogenation of alkanes.
Proline-Based P,O Ligand/Iridium Complexes as Highly Selective Catalysts: Asymmetric Hydrogenation of Trisubstituted Alkenes
作者:Denise Rageot、David H. Woodmansee、Benoît Pugin、Andreas Pfaltz
DOI:10.1002/anie.201104105
日期:2011.10.4
O joins the mix: P,O ligands (L1) form efficient iridiumcatalysts for the asymmetric hydrogenation of olefins. The proline‐derived ligands lead to high enantioselectivities with several classes of alkenes, most notably with α,β‐unsaturated carboxylic esters and ketones, where they match or even surpass the ee values reported for the best N,P and C,N ligands.
Benzylene-linked [PNP] scaffolds and their cyclometalated zirconium and hafnium complexes
作者:Malte Sietzen、Sonja Batke、Patrick W. Antoni、Hubert Wadepohl、Joachim Ballmann
DOI:10.1039/c7dt00413c
日期:——
synthesis of zirconium and hafnium complexes. For both ligands, the dimethylamides [A]M(NMe2)3 ([A]1-M) and [B]M(NMe2)3 ([B]1-M) were prepared and converted to the iodides [A]MI3 ([A]2-M) and [B]MI3 ([B]2-M) (M = Zr, Hf). Starting from these iodides, the corresponding benzyl derivatives [A]MBn3 ([A]3-M) and [B]MBn3 ([B]3-M) (M = Zr, Hf) were obtained via reaction with Bn2Mg(OEt2)2. For zirconium, the benzylic
的亚苄基联[PNP]支架HN(CH 2 - ö -C 6 ħ 4 PPH 2)2([甲] H)和HN(C 6 H ^ 4 - ö -CH 2 PPH 2)2([乙1 H )已用于合成锆和ha络合物。对于两个配体,二甲酰胺[ A ] M(NMe 2)3([A] 1-M)和[ B ] M(NMe 2)3([B] 1-M制备)并将其转化为碘化物[ A ] MI 3([A] 2-M)和[ B ] MI 3([B] 2-M)(M = Zr,Hf)。从这些碘化物开始,通过与Bn 2反应获得相应的苄基衍生物[ A ] MBn 3([A] 3-M)和[ B ] MBn 3([B] 3-M)(M = Zr,Hf)Mg(OEt 2)2。对于锆,[A] 3-Zr和[B]中的苄基配体位置3 -锆被发现容易cyclometalate,这导致了相应的κ 4 - [PCNP] ZrBn 2种配合物[A] 4 -锆和[B]