Results

76 - 100 of 242
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Several derivatives of coumarin-3N-carboxamides (3-21) have been prepared via the reaction of the coumarin-3-carbonyl chloride (1) with a number of nucleophiles. Novel double-headed coumarin-3N-carboxamides (26-33) were also produced using the same method. The Pechmann-Duisberg reaction was applied ...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
A review. Prepn. techniques and characterization of the transition metal-contg. polymers (organometallic polymers) where the metal is bonded to at least one org. group through σ- and/or π-bonds.
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Displacement of the terminal chloro groups of diiron arene complexes with 1-naphthol led to the formation of the corresponding complex with terminal naphthoxy groups. Photolytic demetallation of these complexes produced the monomeric blocks in good yields. Scholl polymn. was implemented leading to t...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Displacement of the terminal chloro groups of the diiron arene complexes with 1-naphthol led to the formation of the corresponding complex with terminal naphthoxy groups. Photolytic demetallation of these complexes produced the monomeric blocks in good yields. Scholl polymn. was implemented leading ...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
A series of functionalized polynorbornenes containing pendent ether- or ester-bridged poly(aromatic ether) chains were prepared. The ether-bridged norbornene complex was synthesized via cyclopentadienyliron-mediated nucleophilic aromatic substitution reactions. This methodology, combined with that o...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Nucleophilic arom. substitution (SnAr) of cyclopentadienyliron-arene complexes with various aliph. or arom. dithiols followed by oxidn. and/or photolysis is presented as a viable route to the prepn. of the corresponding bis(sulfides) and bis(sulfones) in yields of 70-96%. The photochem. reaction of ...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Our research interests have been focused on the design of new monomeric and polymeric materials using organoiron complexes as precursors. Cyclopentadienyliron chloroarene complexes were used to mediate the synthesis of sulfide contg. compds. These compds. were designed with various arom. and aliph. ...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Over the past few decades, we have seen a growing interest in the development of various classes of metal-contg. polymers. While polymers are traditionally carbon-based materials that contain only a few other elements, organometallic polymers could incorporate almost all the other elements of the pe...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
The facile preparation of macrocyclic ethers is achieved using S NAr reactions of (dichlorobenzene)CpFe + complexes with various dinucleophiles, followed by photolytic demetallation; X-ray crystallography gives unequivocal structural proof for one of these macrocycles.
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Organoiron polynorbornene containing arylazo or hetarylazo dye chromophores has been prepared via ring opening metathesis polymerization using Grubbs' catalyst. The obtained polymers were isolated as brightly colored materials and displayed good solubility in polar organic solvents. The colors of th...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
The synthesis of an aromatic ether complex of cyclopentadienyliron containing two terminal aldehyde groups was achieved via metal-mediated nucleophilic aromatic substitution reactions. This dialdehyde monomer was subsequently reacted with a variety of aliphatic and aromatic diamines to produce the c...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
A review on the prepn. and uses of organometallic polymers having metal-carbon bonds in the main or side chains or heteroatom-metal bonds in the main chain.
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Synthetic strategies for the design of oligomeric ethers with pendant cyclopentadienyliron moieties have been developed. A wide range of these materials have been prepared via nucleophilic aromatic substitution reactions of a mono- or di-hydroxyaromatic nucleophiles and a variety of chloroarene comp...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
A unique synthetic route to cyclopentadienyliron complexes of functionalized nitrobenzene has been developed via the successive oxidation of the amine and the alkyl groups of their corresponding aniline complexes. Nucleophilic aromatic substitution reactions of the nitroarene complexes with a number...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Cyclic aryl ethers, thioethers or amines, and methods for synthesis are disclosed. These cyclic aryl compds. are synthesized by combining a first dinucleophile with a substituted benzene metalized electron-withdrawing complex, having halo or nitro substituent groups, to form a linear bimetalized ary...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
As functionalization of the polynorbornene backbone has shown to be a viable route towards altering the thermal and chem. properties of the resulting polymeric material, our focus has been on the prepn. of norbornene monomers contg. a side-chain consisting of a rigid mesogen and/or an aliph. spacer....
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Photolytic demetallation of cyclopentadienyliron complexes was investigated. Effects of solvent nucleophilicity, counter anion, wavelength, and nature of the arene were studied. Initial results indicate a dependence on the wavelength of the light source as well as the duration of photolysis, with de...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Ring-opening metathesis polymn. of organoiron norbornene monomers functionalized with azobenzene chromophores using the Grubbs catalyst was carried out to prep. the corresponding cationic organoiron polynorbornenes. The chiral monomers were prepd. by coupling reactions of complexes and 5-norbornene-...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Nucleophilic aromatic substitution of isomeric chlorotoluenes complexed to the cyclopentadienyliron moiety with ethyl cyanoacetate in the presence of K2CO3 in DMF results in the formation of the isomeric ethyl tolylcyanoacetate complexes. Photolysis of these complexes leads to the formation of the t...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Nucleophilic aromatic substitution (SNAr) of chloroarenes complexed to the cyclopentadienyl iron moiety with ethyl cyanoacetate or phenylsulfonylacetonitrile in the presence of potassium carbonate in DMF resulted in the formation of arylated ethyl cyanoacetate or phenylsulfonylacetonitrile complexes...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
A detailed 1H NMR study of the title compds. I (R = Me, R1 = H; R = H, R1 = Cl) using difference NOE spectra and 2-D (COSY) techniques has shown that there is an enhanced restricted rotation about the arene-methine carbon bond with the formation of the complexes.
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Summary: A new class of macromolecules containing neutral and cationic organoiron moieties with arylazo chromophores in their backbones has been prepared. Photolysis of these polymers resulted in the removal of the cationic iron moieties leading to new polyferrocenes with azo dyes in their backbones...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
The topic of metal-contg. polymers is reviewed with special emphasis on the need for polymeric materials for the 21st century and the role that metal and metalloid-contg. polymers will fill. Also emphasized is the wide variety of potential polymers including varying the metal, oxidn. state of the me...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Reactions of 5-norbornene-2-methanol with arene cyclopentadienyliron complexes led to the synthesis of two new classes of norbornene monomers with ether or ester bridges; ring-opening metathesis polymerization of these monomers using ruthenium-based catalysts gave rise to high molecular weight polym...