Ring-Closing Alkyne Metathesis in the Synthesis of Alkyne-Linked Glycoamino Acids
作者:Floris van Delft、Floris Rutjes、Stan Groothuys、S. van den Broek、Brian Kuijpers、Maarten IJsselstijn
DOI:10.1055/s-2007-990920
日期:2008.1
Synthesis of alkyne-linked glycoamino acids via ring-closing alkyne metathesis is investigated. Two different strategies are described to attach alkynylamino acids to an alkynyl sugar, either via a linker at O-4 or at O-9 of the alkynyl sugar. Ring-closing alkyne metathesis of the O-4 linked diynes failed to proceed, but alkyne-linked glycoamino acids of different chain length were effectively synthesized via attachment at O-9.
PROCESS FOR THE CARBONYLATION OF ETHYLENICALLY UNSATURATED COMPOUNDS, NOVEL CARBONYLATION LIGANDS AND CATALYST SYSTEMS INCORPORATING SUCH LIGANDS
申请人:Eastham Graham Ronald
公开号:US20120330016A1
公开(公告)日:2012-12-27
A novel bidentate ligand of general formula (I) is described together with a process for the carbonylation of ethylenically unsaturated compounds. The group X
1
may be defined as a univalent hydrocarbyl radical of up to 30 atoms containing at least one nitrogen atom having a pKb in dilute aqueous solution at 18° C. of between 4 and 14 wherein the said at least one nitrogen atom is separated from the Q
2
atom by between 1 and 3 carbon atoms. The group X
2
is defined as X
1
, X
3
or X
4
or represents a univalent radical of up to 30 atoms having at least one primary, secondary or aromatic ring carbon atom wherein each said univalent radical is joined via said at least one primary, secondary or aromatic ring carbon atom(s) respectively to the respective atom Q
2
. Q
1
and Q
2
each independently represent phosphorus, arsenic or antimony.
NovelCs-Symmetric 1,4-Diphosphine Ligands in the Copolymerization of Propene and Carbon Monoxide: High Regio- and Stereocontrol in the Catalytic Performance
作者:Antonella Leone、Giambattista Consiglio
DOI:10.1002/hlca.200590002
日期:2005.2
New Cs-symmetric aryl 1,4-diphosphineligands were synthesized and tested in the copolymerization of carbonmonoxide and propene. The electronic properties of the two different P-atoms did not affect the high enantioselectivity of the catalyst precursors, thus resulting in high ‘regio’- and ‘stereoregular’ copolymers.
[EN] PROCESS FOR THE CARBONYLATION OF ETHYLENICALLY UNSATURATED COMPOUNDS, NOVEL CARBONYLATION LIGANDS AND CATALYST SYSTEMS INCORPORATING SUCH LIGANDS<br/>[FR] PROCÉDÉ DE CARBONYLATION DE COMPOSÉS À INSATURATION ÉTHYLÉNIQUE, NOUVEAUX LIGANDS DE CARBONYLATION, ET SYSTÈMES CATALYSEURS COMPRENANT CES LIGANDS
申请人:LUCITE INT UK LTD
公开号:WO2010001174A1
公开(公告)日:2010-01-07
A novel bidentate catalytic ligand of general formula (I) is described. R represents a hydrocarbyl aromatic structure having at least one aromatic ring to which Q 1 and Q 2 are each linked, via the respective linking group, if present, on available adjacent atoms of the at least one aromatic ring. The groups X 3 and X 4 represent radicals joined via tertiary carbon atoms to the respective atom Q 1 and the groups X 1 and X 2 represent radicals joined via primary, or substituted aromatic ring carbon atom(s) to the respective atom Q 2. A and B represent an optional lower alkylene linking group. Q 1 and Q 2 each represent phosphorus, arsenic or antimony. A process for the carbonylation of ethylenically unsaturated compounds comprising reacting the compound with carbon monoxide in the presence of a source of hydroxyl groups, optionally, a source of anions and catalyst system obtainable by combining a metal of Group 8, 9 or 10 or a compound thereof and the bidentate ligand of general formula (I) is also described.
Palladium Complexes of the Heterodiphosphine <i>o-</i>C<sub>6</sub>H<sub>4</sub>(CH<sub>2</sub>P<sup>t</sup>Bu<sub>2</sub>)(CH<sub>2</sub>PPh<sub>2</sub>) Are Highly Selective and Robust Catalysts for the Hydromethoxycarbonylation of Ethene
作者:Tamara Fanjul、Graham Eastham、Natalie Fey、Alex Hamilton、A. Guy Orpen、Paul G. Pringle、Mark Waugh
DOI:10.1021/om100049n
日期:2010.5.24
[Pt(X)(Y)(cod)] with L3 gave [PtCl2(L3)] (3), [Pt(CH3)2(L3)] (6), and [PtCl(CH3)(L3)] (9). At equilibrium, complex 9 is a 90:1 mixture of geometric isomers 9a (with CH3 trans to the tBu2P) and 9b (with Cl trans to the tBu2P). The fluxionality of complex3, detected by 1H NMR, is interpreted in terms of the conformation of the seven-membered chelate. The complexes [Pt(CH3)(PMe3)(L3)]Cl (10b) and [PtH(PPh3)(L3)]Cl
报道了二膦基o- C 6 H 4(CH 2 P t Bu 2)(CH 2 PPh 2)(L 3)的配位化学和乙烯加氢甲氧基羰基化催化反应,并将结果与对称的二膦基o-的类似化学反应进行了比较。 ç 6 ħ 4(CH 2 P吨卜2)2(大号1)和邻- C ^ 6 ħ 4(CH 2 PPH2)2(L 2)。报道了在商业催化条件下钯催化的乙烯加氢甲氧基羰基化的研究。使用所获得的结果大号1 - 3作为支持配体表明,来源于催化剂大号3和大号1具有用于丙酸甲酯(MEP)相似的活性和选择性。另外,Pd- L 3催化剂具有比Pd- L 1催化剂更长的寿命。用L 3处理适当的[Pt(X)(Y)(cod)]得到[PtCl 2(L 3)](3),[Pt(CH 3)2(L 3)](6)和[PtCl(CH 3)(L 3)](9)。在平衡时,络合物9是几何异构体9a(具有CH 3转化为t Bu 2 P)和9b(具有Cl转化为t