Trinuclear {Co<sup>2+</sup>–M<sup>3+</sup>–Co<sup>2+</sup>} complexes catalyze reduction of nitro compounds
作者:Sumit Srivastava、Manvender S. Dagur、Afsar Ali、Rajeev Gupta
DOI:10.1039/c5dt03442f
日期:——
characterization of trinuclear Co2+–Co3+–Co2+} and Co2+–Fe3+–Co2+} complexes with accessible peripheral Co(II) ions. Both trinuclear complexes function as efficientreusable heterogeneous catalysts for the selectivereduction of assorted nitrocompounds to the corresponding amines. The mechanistic investigations suggest the involvement of a Co(II)–Co(I) cycle in the catalysis.
Convenient synthesis of imidazo[1,5-a]pyrimidine derivatives and their unusual recyclization into 3H-imidazo[4,5-b]pyridine derivatives
作者:Valery S. Tolkunov、Andrew S. Tolkunov、Olga V. Smirnova、Sergei V. Tolkunov
DOI:10.1007/s10593-021-02942-2
日期:2021.5
New derivatives of imidazo[1,5-a]pyrimidine have been synthesized by cyclization of in situ generated 1H-imidazol-4(5)-amine with 1,3-diketones or malondialdehyde derivatives. Utilization of asymmetrical 1,3-diketones leads to the formation of a mixture of regioisomers. The discovered conversion of imidazo[1,5-a]pyrimidine core into 3H-imidazo[4,5-b]pyridine that takes place only under acidic conditions
咪唑并[1,5- a ]嘧啶的新衍生物是通过原位生成的1H-咪唑-4(5)-胺与1,3-二酮或丙二醛衍生物环化而合成的。不对称 1,3-二酮的使用导致区域异构体混合物的形成。咪唑并发现转化[1,5-一个]嘧啶核成3 ħ -咪唑并[4,5- b ]吡啶,只有在酸性条件下可以被认为是迪姆罗的新版本发生重排涉及C-N裂解键和 C-C 键的形成。
Determination of inter-ionic and intra-ionic interactions in a monofluorinated imidazolium ionic liquid by a combination of X-ray crystallography and NOE NMR spectroscopy
We report the very first application of a Transient 1D 1 H19 F} NOE NMR experiment in neat ionicliquids. In comparison with classical 2D HOESY NMR spectroscopy, a substantial reduction in measurement time is gained with comparable quality and information content of the spectra. In combination with classical X-ray crystallography, we have applied this technique for the determination of inter-ionic