共查询到20条相似文献,搜索用时 15 毫秒
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I. S. Ponticello 《Journal of polymer science. Part A, Polymer chemistry》1979,17(11):3499-3508
α-Alkylacrylic esters and α-alkylacrylonitriles have been synthesized by cracking their cyclopentadiene adducts. The latter were derived by treatment of the lithium enolates of cyclopentadiene-blocked acrylates or acrylonitriles with alkyl halides. 相似文献
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K. R. Ravi Kumar Basappa K. S. Rangappa H. Mallesha 《Journal of heterocyclic chemistry》2003,40(4):607-609
A selective reduction and its subsequent cyclisation of novel isoxazolidines into γ‐lactams have been examined in presence of Raney ‐ nickel catalyst. 相似文献
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Hafnocene dichloride was reduced with amalgamated magnesium in the presence of alkynes giving high yields of di-η5-cyclopentadienylhafnacyclopentadienes. Reaction with hydrochloric acid yields exclusively the corresponding (E,E)-butadiene derivatives. 相似文献
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Anne-Laure Gérard 《Tetrahedron letters》2007,48(23):4123-4126
A facile method for the synthesis of new pyrazoloisoindolones via a Suzuki cross-coupling reaction using a pyrazolylboronic ester is described. 相似文献
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Oleg V. Gusev Tat'yana A. Peganova Mikhail G. Peterleitner Svetlana M. Peregudova Larisa I. Denisovich Nikolai A. Ustynyuk
Peter M. Maitlis
《Journal of organometallic chemistry》1994,480(1-2):c16-c17Reaction of [Pt2(η5-C5Me5)2(η-Br)3]3+(Br−)3 with C5R5H (R = H,Me) in the presence of AgBF4 gives the first platinocenium dications, [Pt(η5-C5Me5)(η5-C5R5)]2+(BF4− )2. On electrochemical reduction, [pt(η5-C5Me5)2]2+ yields [Pt(η4-C5Me5H)(η2-C5Me5)]+ BF4−. kw]Cyclopentadienyl; Metallocenes; Platinum; Electrochemistry 相似文献
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Graham R. Knox Peter L. Pauson James Rooney 《Journal of organometallic chemistry》1991,420(3):379-386
New substituted η3-allyl(η5-cyclopentadienyl)dicarbonylmanganese cations have been prepared as their tetrafluoroborates. They readily add a wide range of nucleophiles yielding η2-alkene(η5-cyclopentadienyl)dicarbonylmanganese complexes. Of the latter, in general only those involving terminal alkenes are sufficiently stable to permit ready isolation; otherwise metal-free alkenes are obtained. Regioselectivity in these additions depends on the nucleophile. 相似文献
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Reaction of [Cp* RuCl2]2 with
-alanine (
-alaH) in methanol at room temperature in the presence of NaOMe yields the complex Na[Cp* RuCl(
-ala)] (1), which contains a five-membered N,O-coordinated chelate ring. The analogous complex Na[Cp* RuCl(
-phe)] (2) is obtained under similar conditions but at 0°C in 90% yield. At temperatures above 20°C both 2 and the η6-coordinated complex [Cp* Ru(
-pheH)]Cl (4) are obtained, with the proportion of the latter increasing with temperature. Compound 4 is obtained in 88% yield by refluxing [Cp* RuCl2]2 and
-phenylalanine (
-pheH) in CH3OH/CH3ONa followed by separation from 2. The analogous ruthenium(II) sandwich complexes 5–10 were obtained from
-tyrosine and
-tryptophane and various derivatives. [Cp* Ru(
-met)] (3), prepared by the reaction of [Cp* RuCl2]2 with
-methionine (
-metH) in CH3OH/CH3ONa, displays N,O,S-coordination. 相似文献
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The neutral complexes (η5-C5H5NiXL (X = Cl, L = PPh3 (I); L = PCy3 (II); X = Br, L = PPh3 (III); L = PCy3 (IV); X = I, L = PPh3 (V); L = PCy3 (VI)) have been obtained by treating NiX2L2 with thallium cyclopentadienide. The same reaction in the presence of TlBF4 gives cationic derivatives [(η5-C5H5)NiL2]BF4 (L = 2PPh2Me (VII); L = dppe (VIII)), whereas mononuclear complexes containing two different ligands (L2 = PPh3 + PCy3 (IX)) or dinuclear [(η5-C5H5)Ni(PPh3)]2dppe(BF4)2 (X) are obtained from the reaction of III with TlBF4 in the presence of a different ligand. Reduction of cationic complexes with Na/Hg gives very unstable nickel(I) derivatives (η5-C5H5)NiL2, which could not be isolated purely. Similar reduction of neutral complexes under CO gives a mixture of decomposition products containing [(η5-C5H5)Ni(CO)]2 and nickel(o) carbonyls, whereas in the presence of acetylenes, dinuclear [(η5-C5H5)Ni]2(RCCR′) (R = R′ = Ph; R = Ph, R′ = H) are obtained. 相似文献
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Ajay K. Bose M. S. Manhas K. Gala D. P. Sahu V. Hegde 《Journal of heterocyclic chemistry》1980,17(8):1687-1689
Dedicated to Professor John C. Sheehan on the occasion of his sixty-fifth birthday. A method for the synthesis of α-amido-β-lactams without the intermediacy of an α-amino-β-lactam is described. The appropriate β-keto ester is used for preparing a vinylamino β-lactam via a “Dane salt” by a previously reported method. Oxidation with ruthenium tetroxide and periodic acid of this product leads directly to the desired “V”, or “G” or analogous α-amido side chain. 相似文献
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A new and useful synthesis of a title compounds is reported. They can be obtained easily by photocyclization of enedicarbonyl compounds 3 and 4. A different behaviour, ascribed to the geometry of a double bond, is observed; 3 are converted only to butenolides 5, while trans-isomers 4 are converted into alkyl-furyl-ketones 5 and 6. A possible mechanism is described. 相似文献