Inner Complexes of Uranium Containing 1,3-Dicarbonyl Chelating Groups

Schlesinger, H. I.; Brown, Herbert C.; Katz, Joseph; Archer, S.; Lad, R. A.

doi:10.1021/ja01106a050

Cited by 23 publications

(7 citation statements)

References 2 publications

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“…Dried diethyl ether, hexane, and toluene were purified by an M. Braun solvent purification system (SPS). 1,1,1-Trifluoro-5,5-dimethyl-2,4-hexanedione was synthesized according to the literature . Aniline derivatives for ligand synthesis were purchased from Aldrich Chemical or Acros Organics and used without further purification.…”

Section: Methodsmentioning

confidence: 99%

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Synthesis and Characterization of Titanium Complexes Bearing Two β-Enaminoketonato Ligands with Electron-Withdrawing Groups and Their Behavior in Ethylene Polymerization

Zhan

Pan

et al. 2008

Organometallics

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A series of new titanium complexes with two asymmetric bidentate β-enaminoketonato (N,O) ligands (4b-t), [RNdC(CF 3 )CHC(t-Bu)O] 2 TiCl 2 (4b, R, have been synthesized and characterized. X-ray crystal structures suggest that complexes 4a-d, 4j, and 4m all adopt a distorted octahedral geometry around the titanium centers. Two chlorine atoms in complexes 4a-d and 4j are in cis-configuration, while those of complex 4m are trans. NMR spectra and X-ray structure analyses reveal that the conformational isomers of some complexes, such as 4b, in which the two β-enaminoketonato ligands bear asymmetrical N-phenyl rings, exist both in solution and in solid state. With modified methylaluminoxane (MMAO) as a cocatalyst, complexes 4b-l and 4n-q are highly active toward ethylene polymerization and produce high molecular weight polyethylenes. The catalytic activities are significantly enhanced by introducing electron-withdrawing groups (EWG), such as fluorine and chlorine atom(s) or the trifluoromethyl group, into suitable positions on the N-aryl rings. The titanium complex 4m is inactive toward ethylene polymerization due to the trans-configuration of the two chlorine atoms. In addition, the titanium complexes display low catalytic activity for ethylene polymerization only if the N-substituents are not aromatic.

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Section: Methodsmentioning

confidence: 99%

“…1,1,1-Trifluoro-5,5dimethyl-2,4-hexanedione was synthesized according to the literature. 26 Aniline derivatives for ligand synthesis were purchased from Aldrich Chemical or Acros Organics and used without further purification. Commercial titanium tetrachloride was distilled prior to use.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and Characterization of Titanium Complexes Bearing Two β-Enaminoketonato Ligands with Electron-Withdrawing Groups and Their Behavior in Ethylene Polymerization

Zhan

Pan

et al. 2008

Organometallics

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“…Compounds 67 ,11, 12 68, 69 ,13, 14 and 70 ,15, 16 and 74 were obtained by condensation of phenylguanidine nitrate 12 17 and diketones 13 (method B, Pinner reaction) 18. Heating alkylamines 14 , which are more nucleophilic than the corresponding anilines, with the 2‐methylsulfonylpyrimidine 10a in toluene produced alkylaminopyrimidines 33 and 34 .…”

Section: Methodsmentioning

confidence: 99%

Synthesis and structure–activity study of fungicidal anilinopyrimidines leading to mepanipyrim (KIF‐3535) as an anti‐Botrytis agent

Nagata¹,

Masuda

Maeno

et al. 2003

Pest Management Science

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A series of 2-anilinopyrimidines was prepared and their fungicidal activities against Botrytis cinerea Pers were examined. The activity fell sharply with any substitution on the anilinobenzene ring. Substituents at the 5-position of the pyrimidine ring greatly reduced the activity. Substituents such as chloro, methoxy, methylamino, methyl or 1-propynyl were well tolerated at the 4- and 6-positions of the pyrimidine ring. Among these substituents, the combination of methyl and 1-propynyl groups was the most favourable. 2-Anilino-4-methyl-6-(1-propynyl)pyrimidine (KIF-3535), which showed excellent activity and no significant phytotoxicity, was finally selected for development and has been given the common name mepanipyrim.

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“…None of these, however, was as volatile as the borohydride or met hylborohydride. 256 X-Ray and chemical evidence suggests that f orbitals contribute to bonding in uranyl and plutonyl ions. Bonding byforbitals is only significant at small internuclear distances.257 Further work on the disproportionation of pIutonium(1v) in acid solution has shown that a-particles from the plutonium seriously interfere with establishment of equilibrium,258 3Pu4+ + 6 H 2 0 e -2Pu3+ + Pu02++ + 4H30+ Suitable corrections have now been applied.…”

Section: ) 234mentioning

confidence: 99%

Inorganic chemistry

Coates¹,

Glockling²

1953

Annu. Rep. Prog. Chem.

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PROGRESS in the quantitative interpretation of the relative stabilities of metal complexes has been well maintained, and several important papers of a general nature have appeared during the year.A large volume of work on diborane and borohydrides, carried out about ten years ago, and awaited with much interest, has now been published. Some interesting new silicon hydrides have been prepared, e.g., S(SiH,), and P(SiH,),.There have been substantial developments in the chemistry of nitrogen, phosphorus, and sulphur, notably the discovery of the blue unstable compound " imine '' (NH), and the new allotropes, brown phosphorus and both purple and green sulphur; studies on the sulphur nitrides have progressed considerably and two new oxynitrides have been prepared.Progress in the chemistry of fluorine has included the preparation of interesting trifluoromethyl (CF,) derivatives of sulphur, phosphorus, and arsenic, and a new oxyfluoride of iodine (10,F).Greatly improved methods, using liquid ammonia, for the preparation of metal cyclopentadienyls have been used to obtain several new members of this particularly interesting class of compound. Carbonyls, which are now of much industrial importance, e.g., in connection with hydrof ormylation and carbonylation reactions, have received much attention, in particular the substitution of CO by other groups such as isocyanides, and the reactions between carbonyls and organic compounds.Review articles have been published during the year on stratospheric air,l the action of nitric acid on metals,, protactini~m,~ the stereochemistry of nickel and other simple inorganic compounds,7 and inorganic chromatography.s Accurate heats of formation have been obtained for the oxides of tin,g lanthanum, cerium,1° and hafnium,ll and vapour-pressure data for gallium metal,12 the iodides of boron and silicon,13 titanium tetrachloride l4 and uranium he~aflu0ride.l~ Other data are mentioned in later sections.Complexes.-A critical review of new and previously published data on the stability of complexes formed by bivalent ions of the first transition series has shown that the Irving-Williams order Mn < Fe < Co < Ni < Cu > Zn holds for nearly all such complexes irrespective of the nature of the co-ordinating ligand and even of the number of molecules involved. This seems to be a and hexacovalent complexe~,~ the thermochemistry of oxides

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Inner Complexes of Uranium Containing 1,3-Dicarbonyl Chelating Groups

Cited by 23 publications

References 2 publications

Synthesis and Characterization of Titanium Complexes Bearing Two β-Enaminoketonato Ligands with Electron-Withdrawing Groups and Their Behavior in Ethylene Polymerization

Synthesis and Characterization of Titanium Complexes Bearing Two β-Enaminoketonato Ligands with Electron-Withdrawing Groups and Their Behavior in Ethylene Polymerization

Synthesis and structure–activity study of fungicidal anilinopyrimidines leading to mepanipyrim (KIF‐3535) as an anti‐Botrytis agent

Inorganic chemistry

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