K2S as Sulfur Source and DMSO as Carbon Source for the Synthesis of 2-Unsubstituted Benzothiazoles
摘要:
We describe a three-component reaction of o-iodoanilines with K2S and DMSO that provides 2-unsubstituted benzothiazoles in moderate to good isolated yields with good functional group tolerance. Electron-rich aromatic amines and o-phenylenediamines instead of o-iodoanilines provided 2-unsubstituted benzothiazoles and 2-unsubstituted benzimidazoles with and without K2S under similar conditions. Notably, DMSO plays three vital roles: carbon source, solvent, and oxidant.
however oxidative couplings involving amide bonds and functionalization of thioamide C(S)–N analogues remain an unsolved challenge. Herein, a novel hypervalent iodine-induced twofold oxidative coupling of amines with amides and thioamides has been established. The protocol accomplishes divergent C(O)–N and C(S)–N disconnection by the previously unknown Ar–O and Ar–S oxidative coupling and highly chemoselectively
Methine compound-containing silver halide photographic emulsion and photographic material using the same
申请人:——
公开号:US20020012892A1
公开(公告)日:2002-01-31
A silver halide photographic emulsion comprising a methine dye compound having in a molecule thereof at least one atomic group in which at least two groups selected from the group consisting of groups represented by formulas (I) and (II) are adjacent to each other or adjacent to each other through an atom:
X—H
(I)
wherein X represents an atom electrically more negative than a carbon atom,
Y (II)
wherein Y represents an atom electrically more negative than a carbon atom, and has one or more lone electron pairs; and a silver halide photographic material comprising the silver halide photographic emulsion.
一种卤化银感光乳剂,包含一种甲基染料化合物,在其分子中至少有一个原子团,其中至少有两个选自由式(I)和(II)代表的基团组成的组的基团彼此相邻或通过一个原子彼此相邻:
X-H
(I)
其中 X 代表电性比碳原子更负的原子、
Y (II)
其中 Y 代表电性比碳原子更负的原子,并具有一个或多个孤电子对;以及包含卤化银感光乳剂的卤化银感光材料。
Battegay; Boehler, Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1937, vol. 204, p. 1477