Substituent effect on the reverse Menschutkin reaction of 1-methylpyridinium cations with iodide anion can be described in terms of the LArSR equation with ϱ=3.60 which provides evidence against very late transition state of the nitrogen-to-iodine transmethylation.
Active substances for the treatment, diagnosis and prophylaxis of diseases in which abnormal protein structures occur
申请人:Schrader Thomas
公开号:US20050239808A1
公开(公告)日:2005-10-27
The invention on hand refers to diseases associated with abnormal protein structures, including Alzheimer's disease, Creutzfeldt-Jakob's disease, BSE and other prion-associated diseases. It is the task of the invention on hand to provide new active agents preventing the formation of amyloid plaques and to dissolve existing plaques, such agents being convenient for therapy, diagnosis and prophylaxis of diseases that are associated with abnormal protein structures. This task is performed in terms of the current invention by heterocyclic or aromatic agents with a rigid structure and a donor-acceptor-donor pattern (DAD), the latter being formed by donors and acceptors of hydrogen bridge linkages which comply with the β-sheet structure of the peptide or protein and thus fit as binding partners. The heterocyclic or aromatic agents are available at least as dimers. They recognise peptides and proteins with a β-sheet structure, form stable complexes with them and inhibit their aggregation to β-amyloid plaques. Furthermore, the new active agents are able to dissolve β-amyloid plaques that already exist. Another task of the current invention is to provide methods for the synthesis of said heterocyclic or aromatic compounds.
Copper and silver heterometallic iodoantimonates: structure, thermal stability, and optical properties
作者:Irina A. Shentseva、Andrey N. Usoltsev、Nikita A. Korobeynikov、Maxim N. Sokolov、Sergey A. Adonin
DOI:10.1039/d3dt02960c
日期:——
Seven heterometallic iodoantimonates with the general formula (Cat)2[Sb2M2I10]} (M = Cu(I) (1–6), Ag(I) (7)) were prepared. X-ray diffraction data indicate that these compounds are the first Sb(III) representatives of the structural type previously known only for heterometalliciodobismuthates(III). In 3 and 4, halogen-substituted cations form halogen bonds with the heterometallic halometalate chain
制备了七种异金属碘锑酸盐,其通式为(Cat) 2 [Sb 2 M 2 I 10 ]} (M = Cu( I ) ( 1–6 ), Ag( I ) ( 7 ))。 X射线衍射数据表明,这些化合物是先前仅已知异金属碘铋酸盐( III )的结构类型的第一个Sb( III )代表。在3和4中,卤素取代的阳离子与杂金属卤代金属酸盐链形成卤素键。 1-7显示出突出的热稳定性。估计光学带隙介于 2.16 和 2.40 eV 之间。与异金属碘铋酸盐一样,掺入 Cu +而不是 Ag +提供了低得多的带隙。
Electronic effects on the Menshutkin reaction. A complete kinetic and thermodynamic dissection of alkyl transfer to 3- and 4-substituted pyridines
作者:Edward M. Arnett、Ronald Reich
DOI:10.1021/ja00538a031
日期:1980.8
Liveris; Miller, Australian Journal of Chemistry, 1958, vol. 11, p. 297,298