Results 221 to 230 of about 592,273 (269)
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Chemistry – An Asian Journal, 2018
AbstractAromatic aminocatalysis refers to transformations that employ aromatic amines, such as anilines or aminopyridines, as catalysts. Owing to the conjugation of the amine moiety with the aromatic ring, aromatic amines demonstrate distinctive features in aminocatalysis compared with their aliphatic counterparts.
Jian Lv +4 more
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AbstractAromatic aminocatalysis refers to transformations that employ aromatic amines, such as anilines or aminopyridines, as catalysts. Owing to the conjugation of the amine moiety with the aromatic ring, aromatic amines demonstrate distinctive features in aminocatalysis compared with their aliphatic counterparts.
Jian Lv +4 more
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Aromaticity in Metallabenzenes
Chemistry – A European Journal, 2007AbstractThe electronic structure and bonding situation in 21 metallabenzenes (metal=Os, Ru, Ir, Rh, Pt, and Pd) were investigated at the DFT level (BP86/TZ2P) by using an energy decomposition analysis (EDA) of the interaction energy between various fragments. The aim of the work is to estimate the strength of the π bonding and the aromatic character of
Israel, Fernández, Gernot, Frenking
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One-Pot Conversion of Aromatic Bromides and Aromatics into Aromatic Nitriles
Synlett, 2010Various aromatic bromides and iodides were smoothly converted into the corresponding aromatic nitriles in good to moderate yields by the treatment with butyllithium and subsequently DMF, followed by treatment with molecular iodine in aqueous ammonia.
Hideo Togo, Sousuke Ushijima
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Accounts of Chemical Research, 2007
The first example of a family of related aromatic metallacycles has been synthesized, and the physical and chemical properties of its individual members have been investigated. The metallacyclic rings in these compounds are, in general, constructed from pentadienyl- or heteropentadienyliridium precursors via C-H bond activation processes. The molecules
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The first example of a family of related aromatic metallacycles has been synthesized, and the physical and chemical properties of its individual members have been investigated. The metallacyclic rings in these compounds are, in general, constructed from pentadienyl- or heteropentadienyliridium precursors via C-H bond activation processes. The molecules
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Biochemistry, 1996
Within the papain family of cysteine proteinases few other residues in addition to the catalytic triad, Cys25-His159-Asn175 (papain numbering) are completely conserved [Berti & Storer (1995) J. Mol. Biol. 246, 273-283]. One such residue is tryptophan 177 which participates in a Trp-His-type interaction with the catalytic His159.
Bromme, Dieter +6 more
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Within the papain family of cysteine proteinases few other residues in addition to the catalytic triad, Cys25-His159-Asn175 (papain numbering) are completely conserved [Berti & Storer (1995) J. Mol. Biol. 246, 273-283]. One such residue is tryptophan 177 which participates in a Trp-His-type interaction with the catalytic His159.
Bromme, Dieter +6 more
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Aromatic–aromatic interactions in and around α-helices
Protein Engineering, Design and Selection, 2002To understand the role of aromatic-aromatic interactions in imparting specificity to the folding process, the geometries of four aromatic residues with different sequence spacing, located in alpha-helices or five residues from helical ends, interacting with each other have been elucidated.
Rajasri, Bhattacharyya +2 more
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“Carbo-aromaticity” and novel carbo-aromatic compounds
Chemical Society Reviews, 2015Recent advances in experimental and theoretical studies ofcarbo-benzene derivatives, along with the proposition of a generalization of the definition of aromaticity to the two-membered π-rings of triple bonds, suggest relevance for the notion of “carbo-aromaticity”.
Kévin, Cocq +3 more
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Aromaticity and Electrophilic Aromatic Substitution
1977The meaning of the word aromaticity has evolved as understanding of the reason for the special properties of benzene and other aromatic molecules has deepened. Originally, aromaticity was associated with a special chemical reactivity.1 The aromatic hydrocarbons were considered to be those unsaturated systems that underwent substitution reactions in ...
Francis A. Carey, Richard J. Sundberg
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An Insight into the Local Aromaticities of Polycyclic Aromatic Hydrocarbons and Fullerenes
Chemistry – A European Journal, 2003AbstractIn this work we quantify the local aromaticity of six‐membered rings in a series of planar and bowl‐shaped polycyclic aromatic hydrocarbons (PAHs) and fullerenes. The evaluation of local aromaticity has been carried out through the use of structurally (HOMA) and magnetically (NICS) based measures, as well as by the use of a new electronically ...
Jordi, Poater +3 more
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Aromatic–Aromatic Interactions Database, A2ID: An analysis of aromatic π-networks in proteins
International Journal of Biological Macromolecules, 2011The geometrical arrangement of the aromatic rings of phenylalanine, tyrosine, tryptophan and histidine has been analyzed at a database level using the X-ray crystal structure of proteins from PDB in order to find out the aromatic-aromatic (π-π) networks in proteins and to understand how these aromatic rings are connected with each-other in a specific π-
Mukesh, Chourasia +2 more
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