Nitrosation of Aryl and Heteroaryltrifluoroborates with Nitrosonium Tetrafluoroborate
作者:Gary A. Molander、Livia N. Cavalcanti
DOI:10.1021/jo300551m
日期:2012.5.4
converted into a variety of different substituents in a late synthetic stage. In this paper, we disclose a mild, selective, and convenient method for the ipso-nitrosation of organotrifluoroborates using nitrosonium tetrafluoroborate (NOBF4). Aryl- and heteroaryltrifluoroborates were converted into the corresponding nitroso products in good to excellent yields. This method proved to be tolerant of a broad range
Novel couplers of 2,3,5-triaminopyridine and use of the same for dyeing keratin fibers
申请人:Fadli Aziz
公开号:US20050081313A1
公开(公告)日:2005-04-21
The present invention relates to a dye composition comprising at least one oxidation base and at least one coupler of the 2,3,5-triaminopyridine type. This composition may be useful for dyeing keratin fibers, such as the hair. Also disclosed are a process for dyeing keratin fibers and a multi-compartment dyeing kit using the claimed dye composition. Such a composition can make it possible to obtain strong, uniform dyeing results between the end and the root, which are resistant to external agents, while at the same time being capable of giving varied shades, for example, in fundamental shades such as chestnut, grey or black shades.
substitution reactions of 2‑methoxy-3,5-dinitropyridine with secondary cyclic amines in acetonitrile solution at 20 °C are reported. The logarithms of these rate constants are particularly significant as possible measures of the electrophilicity parameters for 2‑methoxy-3,5-dinitropyridine according to the linear free energy relationship log k (20 °C) = s( + ). Additional kinetic data for reactions of 2-methoxy-3