Abstract: The reactivity of (C 5 Me 5 ) 2 Sm (1) with alkenes has been examined and compared with that of (C 5 Me 5 ) 2 Sm(THF) 2 (2) and [(C 5 Me 5 ) 2 Sm(μ-H)] 2 (3). 1 reacted rapidly with a variety of alkenes in hexane or toluene to form allyl complexes and alkane byproducts. Reactions with propene, butene, and allylbenzene formed (C 5 E 5 ) 2 Sm(η 3 -CH 2 CHCH 2 ) (4), (C 5 Me 5 ) 2 Sm(η 3 -CH 2 CHCHMe) (5), and (C 5 Me 5 ) 2 Sm(η 3 -CH 2 CHCHPh) (6), respectively, in 85-95% yield. Complexes 4-6 were also prepared in similar yield from 3 and the appropriate alkene in hexane. Reactions of 3 with these alkenes in toluene formed (C 5 5Me 5 ) 2 Sm(CH 2 C 6 H 5 ) exclusively. 1 reacted with 1,3-butadiene and 1,5-hexadiene to form the bis-allyl complexes [(C 5 Me 5 ) 2 Sm(μ-η 3 -CH 2 CHCHCH 2− )] 2 (7) and [(C 5 Me 5 ) 2 Sm(μ-η 3 -CH 2 CHCH−)] 2 (8). In contrast, 3 reacted with butadiene to form 5. 2 reacts like 1 with allylbenzene and 1,3-butadiene to form 6 and 7

Abstract: Styrene, 2-methyl-1-pentene, 2-phenyl-1-butene, and cis- and trans-2-hexene have been hydrogenated in the presence of catalysts derived from (Al(CH{sub 3})-O){sub n} and (-)-(ethylenebis(4,5,6,7-tetrahydro-1(R)-indenyl))zirconium derivatives. {alpha}-Olefins are readily polymerized with this catalytic system; in the presence of hydrogen, hydrogenated monomers can be obtained depending on the hydrogen pressure. Terminal olefins substituted in the 2- or 3-positions and internal olefins are not polymerized but undergo hydrogenation. Styrene is hydrogenated at 12 turnovers/min at 20 atm of H{sub 2} at 25{degree}C with this catalytic system. The catalytic deuteriation of styrene with ((-)-(EBTHI)ZrX, X = (R)-1,1{prime}-bi-2-naphtholate) 2 yields (-)-(R)-1,2-dideuterioethylbenzene in 93% yield with an optical purity of 65%, indicating that the (Re) enantioface of styrene is deuterated preferentially.

Abstract: A supported Mn–porphyrin catalyst has been prepared by immobilisation of the tetracationic Mn [meso-tetra (4-N-methylpyridiniumyl)porphyrin]Cl4+ on montmorillonite, and is found to be efficient for alkene epoxidation and alkane hydroxylation by PhlO, with a higher ability to oxidize alkanes, and in particular short linear alkanes, than corresponding homogeneous or silica-supported Mn–porphyrin catalysts.

Abstract: This paper describes the IR characterization of nonclassical H 2 complexes where ethene or norbornadiene (NBD) is coordinated to the same d 6 metal center as the η 2 -H 2 and discusses the role of such complexes in the photocatalytic hydrogenation of NBD by group 6 metal carbonyl compounds. The dihydrogen complexes are generated in solution by the photolysis of alkene and diene carbonyl complexes in the presence of an overpressure of H 2 or D 2

Abstract: An analysis of 105 and 622 C–H ⋯ O bond geometries retrieved from 69 alkyne and 131 alkene structures in the Cambridge Structural Database shows that more acidic C–H groups tend to form stronger bonds but that even weak C–H ⋯ O bonds have pronounced linearity.

Abstract: Pentenes, both 1-pentene and a mixture of cis-2- plus trans-2-pentene, are essentially inert toward hydrogenation, incorporation, positional, and perhaps cis-trans isomerization, during Fischer-Tropsch synthesis with a promoted iron catalyst under medium-pressure conditions. 1-Decene does undergo isomerization, hydrogenation, and incorporation, and ethene undergoes the latter two conversions. 1-Decene conversion is believed to be due primarily to hold up in the CSTR. Alkanes appear to be a primary product of the Fischer-Tropsch synthesis and not formed just by secondary reactions

Abstract: Transition-metal oxides supported on and chemically interacting with the surface of SiO2, Al2O3, TiO2etc. form discrete monolayers of species unlike those found at the surface of the unsupported oxides, being in effect two-dimensional compounds. Areas of their application include alkene metathesis and polymerisation, selective reduction of NO by NH3, and selective oxidation of aromatics. They are readily detected by Raman spectroscopy, FTIR and EXAFS/XANES, and thermal methods and XPS assist their characterisation. They can exhibit strong acidic character, mainly of the Bronsted type; whereas isopropyl alcohol decomposition on MoO3TiO2 gives chiefly dehydration, the main product over V2O5/TiO2 is acetone. The unique ability of the latter system to catalyse the selective oxidation of o-xylene to phthalic anhydride is attributed to the ability of the surface species to undergo oxidative addition at VO groups and to effect the elimination of H atoms in adsorbed radicals as water. When the amount of supported oxide exceeds the monolayer capacity, two further forms of the oxide are detectable, both differing in their reactivity from that of the bulk oxide.

Abstract: On etudie la possibilite d'une approche concertee supra-antara entre les deux molecules et la possibilite d'une reaction non concertee mettant en jeu des especes diradicalaires

Abstract: A RuO2–CH3CHO system selectively catalyses oxdative cleavage of carbon–carbon double bonds of terminal and α,β-unsaturated carbonyl compounds using molecular oxygen to give the corresponding carbonyl compounds.

Abstract: Un rapide apercu des travaux concernant l'activite oxydante de complexes oxo vis a vis d'amines tertiaires ou d'alcenes.

Abstract: Palladium-catalyzed twofold coupling reactions of 1,2-dibromocycloalkenes 4, 7 with alkenes 2 give high yields of (E,Z,E)-1.3,5-hexatrienes 5, 8 which thermally cyclize to ringannulated 1,3-cyclohexadienes 6, 9. Two-, three- and fourfold Heck type coupling reactions were also achieved with vicinal di-13, tri- 16, and tetrabromobenzene 18 under appropriate conditions.

Abstract: In this study we report a series of reactions related to the tittle in which we examined the influence of the substituents as the stereocenter, the alkene geometry, and the electronic nature of the double bond on the cycloaddition stereochemistry

Abstract: trans-[PtCl2(CnH2n+1OC6H4CHCHC5H4N)(η2-CH2CHCmH2m+1)](2) form stable smectic A mesophases on heating (for n7, m7; n8, m5; n9, m2; and n11, m0); melting temperatures below 50 °C can easily be achieved.

Abstract: Reactions de Cp 2 ZrCH 3 + (Cp=cyclopentadienyl) et Cp 2 ZrCD 3 + avec divers alcenes et alcynes, H 2 et D 2

Abstract: The preparation of complexes [MX2(1)] (M = Ni, Pd, and Pi; X - Cl, Br, and I; 1 = 1,2-bis[(diphenylphosphino)methyl]benzene). [Pt(OSO2CH3)Et(1)], [Pt(alkene)(1)] (alkene - C2H2, and CH2 = CHCN), and [(1)Pt-(μ-H)2PtH(1)][BPh4] is reported. Their 1H- and 31P-NMR spectra were recorded and used lor structural assignments. The X-ray crystal structure of [Pt(C2H4)(1)] was determined. It is shown that the PPtP bond angle in this complex differs significantly from those found in related compounds with monodentate phosphines, and that this difference is likely to be due to intramolecular contacts.

Abstract: Photoreaction of the title compound Phl+–C(RFSO2)2 which was synthesised by the reaction of bis(perfluoroalkanesulphonyl) methane with diacetoxyiodobenzene, with alkene, methanol, bromine and benzene gave corresponding addition or insertion products, via the bis(perfluoroalkanesulphonyl) carbene, (RFSO2)2C: intermediate.