Results 121 to 130 of about 925 (184)
Transmetalation From Boron to Beryllium in Phosphorus-Based Scorpionate Complexes. [PDF]
ChemistryBerthold C, Lochte MH, Buchner MR.
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Quantifying Kinetically Relevant Species on Zr-SiO2 Materials for MPV Reduction. [PDF]
ChemphyschemChase E, Notestein J.
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ChemInform, 1992
Pentamethylcyclopentadienyl bromide 1 reacts with silver tetrafluoroborate with abstraction of the halide ion to form pentamethylcyclopentadienylium tetrafluoroborate (2). The 4-pi-antiaromatic cation in 2 can be trapped with different nucleophiles. Thus, 2 reacts with methanol to give 5-methoxy-1,2,3,4,5-pentamethyl-1,3-cyclopentadiene (4).
Jutzi, Peter, Mix, Andreas
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Pentamethylcyclopentadienyl bromide 1 reacts with silver tetrafluoroborate with abstraction of the halide ion to form pentamethylcyclopentadienylium tetrafluoroborate (2). The 4-pi-antiaromatic cation in 2 can be trapped with different nucleophiles. Thus, 2 reacts with methanol to give 5-methoxy-1,2,3,4,5-pentamethyl-1,3-cyclopentadiene (4).
Jutzi, Peter, Mix, Andreas
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Pentamethylcyclopentadienyl diruthenium chemistry
Journal of the Chemical Society, Chemical Communications, 1984The Chemistry of the diruthenium centre, when stabilised by η-C5Me5 ligands, provides examples of new organic transformations (e.g. isomerisation of ethylene to ethylidene, addition of ethylene to vinylidene) and new species {e.g.[Ru2(CO)2(µ-H)2(η-C5Me5)2]}.
Nigel J. Forrow, Selby A. R. Knox
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Journal of Organometallic Chemistry, 1985
Abstract Reaction of dichloro- or dibromo-(pentamethylcyclopentadienyl)phosphane with Group I or Group II metals gives pentamethylcyclopentadienyl substituted diphosphene, bicyclo[1.1.0]tetraphosphane, cyclotetraphosphane and cyclotriphosphanes, which have been unambiguously characterised from their NMR data.
Jutzi, Peter, WIPPERMANN, T
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Abstract Reaction of dichloro- or dibromo-(pentamethylcyclopentadienyl)phosphane with Group I or Group II metals gives pentamethylcyclopentadienyl substituted diphosphene, bicyclo[1.1.0]tetraphosphane, cyclotetraphosphane and cyclotriphosphanes, which have been unambiguously characterised from their NMR data.
Jutzi, Peter, WIPPERMANN, T
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Dimers of delocalised radicals: pentamethylcyclopentadienyl and pentadienyl
Journal of the Chemical Society, Perkin Transactions 2, 1993The thermal dissociation of bis(pentamethylcyclopentadienyl) to pentamethylcyclopentadienyl radicals has been studied by EPR spectroscopy in the temperature range 365–393 K. The enthalpy of dissociation of the dimer is found to be 18.8 kcal mol–1 and combination of this result with empirical and semi-empirical estimates of the enthalpies of formation ...
Culshaw, P.N. +3 more
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Protonation of decamethylsilicocene [bis(pentamethylcyclopentadienyl)silicon]
J. Chem. Soc., Chem. Commun., 1988In general, decamethylsilicocene (1) reacts with Bronsted acids under oxidative addition yielding SiIV compounds of the type (Me5C5)2Si(H)X (2)–(7); as an exception, the cyclotetrasilane (Me5C5SiF)4(8) is formed in the reaction with tetrafluoroboric acid and has been characterized by an X-ray diffraction study.
Jutzi, Peter +3 more
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Organometallics, 1990
By treatment of the alkoxo complex (Cp{sup *}Ru(OMe)){sub 2} with acid or trimethylsilyl trifluoromethanesulfonate in the presence of a polycyclic arene, the monocations Cp{sup *}Ru(arene){sup +} (arene = naphthalene ((1){sup +}), phenanthrene ((2){sup +}), pyrene ((3){sup +}), anthracene ((4){sup +})) and dications (Cp{sup *}Ru){sub 2}(arene){sup 2+} (
Ulrich Koelle, Maja Hong Wang
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By treatment of the alkoxo complex (Cp{sup *}Ru(OMe)){sub 2} with acid or trimethylsilyl trifluoromethanesulfonate in the presence of a polycyclic arene, the monocations Cp{sup *}Ru(arene){sup +} (arene = naphthalene ((1){sup +}), phenanthrene ((2){sup +}), pyrene ((3){sup +}), anthracene ((4){sup +})) and dications (Cp{sup *}Ru){sub 2}(arene){sup 2+} (
Ulrich Koelle, Maja Hong Wang
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Pentamethylcyclopentadienyl-übergangsmetall-π- komplexe
Journal of Organometallic Chemistry, 1985Abstract The complex [Cp′Co(μ-Cl)] 2 , (Cp′ = η 5 -C 5 Me 5 ), 2a , is cleaved by pyridine to yield the mononuclear, paramagnetic cobalt(II) halfsandwich compound Cp′CoCl(C 5 H 5 N), 3a . Single crystal structure determination of 3a confirms its monomeric structure in the solid state and reveals CoC bond lengths (206–209 pm) comparable to those ...
E. Raabe, U. Koelle
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ChemInform, 1987
AbstractThe title chloride (I) undergoes replacement of chlorine by various nucleophiles such as silyl‐substituted cyclopentadienides (II), Li amides LiR4R5, or LiCH(SiMe3)2 to give the unsym. germanocenes (III), the unsym. substituted new germylenes (V), or (VI).
P. JUTZI +3 more
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AbstractThe title chloride (I) undergoes replacement of chlorine by various nucleophiles such as silyl‐substituted cyclopentadienides (II), Li amides LiR4R5, or LiCH(SiMe3)2 to give the unsym. germanocenes (III), the unsym. substituted new germylenes (V), or (VI).
P. JUTZI +3 more
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