Showing papers by "Henri Rudler published in 1989"
TL;DR: The reaction of the aminocarbene complex (CO) 5 Cr=C(CH 3 )NHCH 2 CH=CH 2 with lithium diisopropylamide followed by methyl iodide led, to (CO, 5 Cr =C( CH 3 )N( CH 2 CH =CH 2 and, to(CO, 4 Cr = C(CH 2 )N (CH 3 ),CH 2, CH = CH 2 )
42 citations
TL;DR: The structures of (CO) 5 -CrC(CH 3 )N(CH 2 Ph)CH 3 (3 Z ) (R 0.031 R w 0.030) and of the chromium tricarbonyl complex of the pyrrolinone as discussed by the authors, which was determined by the X-ray diffraction.
28 citations
TL;DR: In this article, the authors studied the carbonylation of the μ-alkylidene complexes Fe 2 (CO) 8 CH 2 ) (1 ) and Pd 2 I 2 (PPh 2 CH 2 PPh 2 ) 2 CH2 ( 2 ) has been studied under a variety of conditions.
18 citations
TL;DR: Tris(tetraphenylimidodiphosphinato) praseodynium reacts with ammonium or potassium salts of carboxylic acids to give dinuclear dicarboxylato complexes as mentioned in this paper.
Abstract: Tris(tetraphenylimidodiphosphinato)praseodynium reacts with ammonium or potassium salts of carboxylic acids to give dinuclear dicarboxylato complexes, the structure of which has been established and which can be used for the determination of the enantiomeric purity of carboxylic acids.
15 citations
TL;DR: In this paper, the unsaturated thiolactones H2CCHCHCH3(CH3)-CSC(O)C(Ph)C Ph and CH3(H) CSC(O) C(PhC Ph) and CH 3(H)) were generated by migration of the allyl group from sulfur to carbon.
13 citations
TL;DR: In this paper, a mechanism of activation by AlCl3 is proposed involving a modification of the nature of carbene 1 by the Lewis acid, which is shown to be more efficient than AlEt3 for cyclo-olefin polymerization.
Abstract: Addition of aluminium compounds to the stable metal-carbene complex tetracarbonyl[4–5-η-1-methoxy-4-pentenylidene]tungsten (1), showing an intramolecular coordination of double bond to the transition metal, leads to highly active catalytic systems in the polymerization of norbornene. It is shown that, in optimal conditions, AlCl3 is more efficient than AlEt3 for cyclo-olefin polymerization. From spectroscopic studies (UV-visible, 1H and 13C NMR) of the activated system 1-AlCl3, a mechanism of activation by AlCl3 is proposed involving a modification of the nature of carbene 1 by the Lewis acid.
4 citations
01 Jan 1989
TL;DR: In this article, the synthesis of a series of alkene-carbene complexes of tungsten and chromium was described, where the unsaturated alkyl chain does not contain a heteroatom.
Abstract: The synthesis of a series of alkene-carbene complexes of tungsten and chromium will be described. When the unsaturated alkyl chain does not contain a heteroatom, the reaction with alkynes leads in fairly good yields to alkyne-insertion/alkene-cyclopropanation products. A mechanism of this new reaction will be outlined. In the case of chromium, when the carbene carbon atom bears a disubstituted amino group, an insertion of alkynes and CO, followed by an unprecedented rearrangement, related to the Stevens rearrangement takes place. This new reaction leads to lactams. The scope and limitations of this reaction will be discussed.
TL;DR: In this paper, the coupled alkyne insertion double-bond cyclopropanation reactions are general for complexes bearing the bidentate alkene-aminocarbene ligands, provided that no phenyl group is present on the carbene carbon atom.
Abstract: It is demonstrated that the coupled alkyne insertion double-bond cyclopropanation reactions are general for complexes bearing the bidentate alkene-aminocarbene ligands, provided that no phenyl group is present on the carbene carbon atom.
TL;DR: A chromium carbene complex bearing a 2-methylaziridine ring system on the carbene carbon atom easily undergoes a double diphenylacetylene and a single CO insertion reaction to give a 1-oxotetrahydroindolizine derivative, which has been fully characterized by X-ray analysis of its Cr(CO)3 adduct.
Abstract: A chromium carbene complex (2) bearing a 2-methylaziridine ring system on the carbene carbon atom easily undergoes a double diphenylacetylene and a single CO insertion reaction to give a 1-oxotetrahydroindolizine derivative (4), which has been fully characterized by X-ray analysis of its Cr(CO)3 adduct (3).