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11.
The functionalized diphosphiranes 1 a–c, in presence of Lewis acid, undergo two kinds of reaction:the ring opening leading to the phosphenium-phosphonium ion 2a–c obtained according to an electrocyclic reaction and the fragmentation giving phosphaalkene 3a–c and phosphonium ion 4. The deprotonation reaction of 2a–c in hexane leads to phosphino-phosphaalkenes 6a–c. 相似文献
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Maryse Gouygou Jean-Claude Daran Bernd Heim Yves Jeannin 《Journal of organometallic chemistry》1993,460(2):219-228
Reaction of R---N=C=N---R (R=p-Me-C6H4) and R---P==C=P---R (R=2,4,6-tBu3C6H2) with the di-iron aminocarbene complex [Fe2(CO)7{1μ-C(Ph)C(NEt2)}] (1c) gave corresponding complexes [Fe2(CO)6{C(Ph)C(NEt2)C(NC6H4Me)N (C6H4Me)}] (2) and [Fe2(CO)6{C(Ph)C(NEt2)C(PC6H2tBu3)P(C6H2tBu3)}] (4), resulting from a coupling reaction with carbon-carbon bond formation. [Fe2(CO)5(CNC6H4Me){C(Ph)C(NEt2)N(C6H4Me)}], complex 3, obtained in the reaction with R---N=C=N---R, resulted from C=N bond rupture insertion of a nitrene fragment into the Fe=C bond. Complexes 2–4 were characterized by X-ray diffraction. The different geornetries of complexes 2 and 4 are discussed. The formation of these complexes may be explained by cycloaddition on the Fe =C metal-carbene bond. 相似文献
14.
Robé E Perlikowska W Lemoine C Diab L Vincendeau S Mikolajczyk M Daran JC Gouygou M 《Dalton transactions (Cambridge, England : 2003)》2008,(21):2894-2898
Diphosphine sulfides derived from 2,2'-biphosphole have been efficiently synthesized in an enantiomerically pure form by a four step synthetic sequence. These S,S-ligands were used for the first time in Pd-catalyzed asymmetric allylic alkylation. Good yields and enantiomeric excess up to 73% were obtained. 相似文献
15.
Lisa Diab Jean‐Claude Daran Maryse Gouygou Eric Manoury Martine Urrutigoïty 《Acta Crystallographica. Section C, Structural Chemistry》2008,64(1):m43-m45
Two enantiopure palladium(II) complexes, viz. [1,1′‐(butane‐1,3‐diyl)‐3,3′,4,4′‐tetramethyl‐5,5′‐diphenyl‐2,2′‐biphosphole]dichloridopalladium(II) dichloromethane solvate [systematic name: dichlorido(1,2,5,10,11‐pentamethyl‐3,9‐diphenylperhydrodicyclopenta[a,c][1,4]diphosphepine‐κ2P,P′)palladium(II) dichloromethane solvate], [PdCl2(C28H30P2)]·CH2Cl2, have been synthesized from stereodynamic diphosphines derived from 2,2′‐biphosphole through a metal kinetic dynamic resolution. In both structures, the coordination around the metal atom is square planar, with a cis arrangement of the ligands that drastically reduces the dihedral angle between the two phosphole rings compared with the free ligand. The structural determination of both enantiomers unambiguously establishes the absolute configuration of both central and axial elements of chirality of the 2,2′‐biphosphole framework and indicates that the original carbon chirality of the backbone controls the chiralities of the 2,2′‐biphosphole framework. 相似文献
16.
Jean-Claude Daran Nicolas Gimeno Maryse Gouygou Jrme Volkman 《Acta Crystallographica. Section C, Structural Chemistry》2019,75(5):523-528
The self‐assembly of ditopic bis(1H‐imidazol‐1‐yl)benzene ligands ( L H) and the complex (2,2′‐bipyridyl‐κ2N,N′)bis(nitrato‐κO)palladium(II) affords the supramolecular coordination complex tris[μ‐bis(1H‐imidazol‐1‐yl)benzene‐κ2N3:N3′]‐triangulo‐tris[(2,2′‐bipyridyl‐κ2N,N′)palladium(II)] hexakis(hexafluoridophosphate) acetonitrile heptasolvate, [Pd3(C10H8N2)3(C12H10N4)3](PF6)6·7CH3CN, 2 . The structure of 2 was characterized in acetonitrile‐d3 by 1H/13C NMR spectroscopy and a DOSY experiment. The trimeric nature of supramolecular coordination complex 2 in solution was ascertained by cold spray ionization mass spectrometry (CSI–MS) and confirmed in the solid state by X‐ray structure analysis. The asymmetric unit of 2 comprises the trimetallic Pd complex, six PF6? counter‐ions and seven acetonitrile solvent molecules. Moreover, there is one cavity within the unit cell which could contain diethyl ether solvent molecules, as suggested by the crystallization process. The packing is stabilized by weak inter‐ and intramolecular C—H…N and C—H…F interactions. Interestingly, the crystal structure displays two distinct conformations for the L H ligand (i.e. syn and anti), with an all‐syn‐[Pd] coordination mode. This result is in contrast to the solution behaviour, where multiple structures with syn/anti‐ L H and syn/anti‐[Pd] are a priori possible and expected to be in rapid equilibrium. 相似文献
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Elvia P. Sánchez-Rodríguez Salvador Cortés-Mendoza Jean-Claude Daran M. Carmen Ortega-Alfaro José G. López-Cortés Maryse Gouygou 《应用有机金属化学》2020,34(8):e5709
P-pyrrole phosphines (R2Ppyr), in which a pyrrole group is directly bonded to the phosphorus atom, act as monodentate k-P ligands towards gold(I) center to afford either neutral or cationic mononuclear complexes as well as neutral dinuclear complexes. All of these new gold(I) complexes have been structurally characterized and their first uses in catalysis have demonstrated their effectiveness as precatalysts for the enyne cycloisomerization reactions. 相似文献
18.
Farkas G Balogh S Madarász J Szöllősy Á Darvas F Ürge L Gouygou M Bakos J 《Dalton transactions (Cambridge, England : 2003)》2012,41(31):9493-9502
A series of new phosphine-phosphite ligands P(C)(n)OP (n = 1-4) have been synthesized and used for rhodium-catalyzed asymmetric hydrogenation of prochiral olefins in order to study the effect of the chelate ring size. Excellent ees (up to 97.5%) were obtained in the hydrogenation of dimethyl itaconate and an increase of activity and enantioselectivity was observed in the hydrogenation of (Z)-α-acetamidocinnamic acid methyl ester with the increasing length of the backbone of the ligands. 相似文献
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The structural and electronic transport properties of La1−x
Ce
x
MnO3 (x=0.0–1.0) have been studied. All the samples exhibit orthorhombic crystal symmetry and the unit cell volume decreases with
Ce doping. They also make a metal-insulator transition (MIT) and transition temperature increases with increase in Ce concentration
up to 50% doping. The system La0.5Ce0.5MnO3 also exhibits MIT instead of charge-ordered state as observed in the hole doped systems of the same composition. 相似文献