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601 - 625 of 705
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Reaction of the cyclopentadienyliron (CpFe) complex e.g. I-III with an excess of BuNH2 gave only monosubstitution of one of the two chlorogroups, whereas a similar reaction carried out in the presence of some added HOAc resulted in disubstitution of both chloro groups. However, in the reaction of I-...
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The ring-opening reaction of 7-oxabicyclo[2.2.1]hept-5-enes with cuprates is described. SN2′ attack with retention of configuration is the predominant pathway. The ring opening reaction of symmetrical and unsymmetrical 7-oxabicyclo[2.2.1]heptenes using cuprates is described. High yields of cycloh...
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The living ring-opening metathesis polymns. of deltacyclene (I) and 5-(tert-butyldimethylsiloxy)deltacyclene (II) in presence of the Schrock catalyst Mo(=CHCMe2Ph)[=N-2,6-(iso-Pr)2Ph](O-tert-Bu)2 were described. II was prepd. by first epoxidizing I, then treating this epoxide with a Lewis acid in pr...
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Reaction of [(η6-o-Cl2C6H4)Fe(η5-C5H5)][PF6] (I) with an excess of PhOH or p-MeC6H4SH in the presence of K2CO3 gave disubstitution of both chloro groups of I, whereas a similar reaction with one equiv of the nucleophile under conditions of high diln. gave monosubstitution of one of the chloro ...
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Polydeltacylene (I) having >95% cis-configuration was prepd. by ring-opening metathesis polymn. in presence of ReCl5. Treatment of I with dimethyldioxirane gave quant. epoxidn., and polynorbornene exhibited similar behavior.
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n6-Chloroarene or nitroarene-n5-cyclopentadienyliron hexafluorophosphates react readily with CF3CH2OH/K2CO3 or with piperidine or piperazine to give nucleophilic aromatic substitutions with Cl or NO2 as the leaving group, further demonstrating an activation for SNAr reactions by complexation to the ...
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A discussion of recent developments into the preparative and structural aspects of Fc-peptide conjugates is presented. In particular, the use of disubstituted Fc systems to control the structure is highlighted. The recent efforts of incorporating Fc into peptide-like oligo- and polyamides and dendri...
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Dimethylplatinum(II) complexes [PtMe2(NN)] {NN = bpy (2,2'-bipyridine), phen (1,10-phenanthroline) or bu2bpy (4,4'-di-tert-butyl-2,2'-bipyridine)} were reacted with alkyl halides (RX = EtI or EtBr, NN = bu2bpy; RX = nBuBr, NN = bpy; RX = CHPh2Br, NN = bpy, phen, or bu2bpy) to yield the Pt(IV) comple...
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A review. This chapter reviews research published on conjugated metal-contg. polymers from late 1998 to mid-2005. It includes polymers where the metal is incorporated into the backbone or the side chain of a conjugated polymer. Kingsborough and Swager wrote an excellent review of the field up to lat...
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A review presents the redox properties and redox-based functionalities of multi-nuclear metal complex systems such as conjugated linear polymers of oligo- and polyferrocenylene derivs. and organometallic π-conjugated conducting polymers made of metallacyles. [on SciFinder(R)]
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The effects of simple salts, surfactant concn., temp., aging, pH, a nonanionic surfactant (Triton X-100), the presence of a hydrocarbon phase (n-decane) on the flow curves of an anionic surfactant, a triethylene glycol C12-15 monoether sulfate sodium salt (Neodol 25-3S) are studied. [on SciFinder(R)...
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The near-edge x-ray absorption fine structure (NEXAFS) spectra of poly(Ph thioether) polymers with pendant Fe(Cp) iron moieties have been recorded at the carbon 1s, iron 2p, and phosphorus 1s and 2p edges. This study shows that soln. photofragmentation of the organometallic polymer causes the remova...
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We have examined the electronic structure of a series of metal arene monomers and polymers by near-edge X-ray absorption fine structure spectroscopy. We observe that electron-donating or -withdrawing substituents have a measurable effect on some features in the NEXAFS spectra of these species. Howev...
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Nucleophilic substitution of chlorine in the ironcyclopentadienyl hexafluorophosphates of chlorobenzene, isomeric chlorotoluenes and dichlorobenzenes (1) with the anions generated from diethyl alkylmalonates (2) and (3) leads to the formation of ironcyclopentadienyl complexes of diethyl alkyl(substi...
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A review. A comprehensive review of organometallic polymers having various monomers, their structural characteristics and various polymn. methods is given.
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In the title compd., [Fe(C13H11O2)2], there are markedly different orientations of the two phenylmethoxycarbonyl substituents [O-C-C-C torsion angles = 84.5(3) and 139.6(2)°]. These orientations are mediated by a no. of intermol. C-H···O interactions, which result in a one-dimensional hy...
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A review. The study of metal-contg. block copolymers represents one of the most active areas in the metallopolymer field. As illustrated in this chapter, exciting possibilities exist for the development of new functional nanostructured materials via simple self-assembly approaches. Despite the obvio...
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An efficient synthesis of 3-mono or 3,4-disubstituted cinnolines from (o-dichlorobenzene)(cyclopentadienyl)iron hexafluorophosphate in 3 or 4 steps is reported. o-Chlorophenylalkyl or alkylaryl ketone complexes obtained from the o-dichlorobenzene complex upon treatment with enolate anions, react wit...
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Potassium fluoride - Celite has been found to be an effective heterogeneous catalyst in arylation of 1,3-dicarbonyl compounds with substituted arenes activated by π-complexation with the ironcyclopentadienyl moiety.
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Organometallic-mediated radical polymerization (OMRP) has emerged as a powerful new class of living controlled radical polymerization. In order to fulfill its potential in the polymerization of vinyl acetate (VOAc) and other challenging monomers, the effects of ancillary ligands on the metal-alkyl b...
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Electrolysis of arene and heterocycle cyclopentadienyliron hexafluorophosphates led to the liberation of arenes or heterocycles in 69-90% yield. The procedure described gives yields comparable with or superior to the yields obtained from pyrolytic sublimation used previously.
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A review covers the recent approaches to metal arrays on artificial DNAs and cyclic peptides. [on SciFinder(R)]
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A review. This chapter discusses the synthesis, structures, selected properties, and uses of polymers that have metal-metal bonds incorporated into their backbone chains. These materials are of interest for a no. of reasons. The primary reason is the promise of new and unusual properties. In particu...
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A review on rigid-rod transition metal polyyne polymers. [on SciFinder(R)]
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Order of proceedings for the installation ceremony and a biographical sketch of Dr. Abd-El-Aziz.