Results 251 to 260 of about 40,685 (294)
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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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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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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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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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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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Taking the Aromaticity out of Aromatic Interactions
Angewandte Chemie, 2011Jacob W G, Bloom, Steven E, Wheeler
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Aromatic Metamorphosis: Skeletal Editing of Aromatic Rings
Accounts of Chemical ResearchConspectusAromatic rings are fundamental structural motifs found in natural products, synthetic intermediates, pharmaceuticals, agrochemicals, and functional materials. While transformations at the periphery of these rings are well-established, modifying their core frameworks has remained an underexplored frontier.
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