Cobalt-Catalysed Carbon-Carbon Bond-Formation Reactions

Abstract

C o b a l t -C a t a l y s e d C a r b o n -C a r b o n B o n d -F o r m a t i o n R e a c t i o n sAbstract: The recent developments in cobalt catalysis are compiled in this review covering the years 2000 through 2007. Special focus is directed towards cobalt-catalysed ring-formation reactions as well as towards cobalt-catalysed (cross-) coupling reactions and synthetically useful applications thereof in the synthesis of acyclic compounds.

Cyclization of Thiopropargyl Benzimidazoles by Combining Iron(III) Chloride and Diorganyl Diselenides

“…The metal-catalyzed cyclization reaction is a powerful method for the preparation of carbo- and heterocycle compounds that are biologically active or are used as potent building blocks in organic synthesis . Many excellent reviews are available dealing with cyclization by using different metals, such as cobalt, gold, copper, iron, mercury, palladium, ruthenium, rhodium, silver, platinum, and others. In recent years, the necessity in the development of most user-friendly systems in the synthesis of heterocycles using environmentally friendly, cost-effective, green, and mild methodologies has grown significantly .…”

“…[2][3]prop-2-yn-1-yl)thio)-1H-benzo[d]imidazole (1d).13 C{ 1 H} NMR (DMSO-d 6 , 100 MHz): δ (ppm) 148.8, 133.9, 133.6,…”

Activation of H2O2 and superoxide production using a novel cobalt complex based on a polyampholyte

“…The application of the transition metal cobalt in organic transformation has attracted increasing interest especially due to its lower cost when compared with its higher homologues [3].…”

Modulating the Electronic Structure of Co in Co–Co6Mo6C2 for Effective Oxygen Evolution Reaction

“…The D band (disordered sp 3 ) is attributed to structural defects of partially disordered configurations in a carbon matrix, while the G band (graphitic sp 2 stretching) is correlated with the degree of graphitization. , The calculated I D / I G results (Figure d) show that the smallest peak intensity ratio (0.49) among the as-prepared samples belongs to the CMC@NC-120-750, indicating the highest degree of graphitization . The I D / I G decreases from 0.69 (CMC@NC-90-750) to 0.49 (CMC@NC-120-750), which is attributed to the fact that increased Co amount accelerates the graphitized carbon generation as Co catalyzes the C–C bond formation. − However, as for CMC@NC-150-750, excessive Co leads to lower graphitization, which is consistent with the previous studies . Moreover, the I D / I G values are 0.91 and 0.81 when Mo-Co-PANI samples were calcined at 650 and 850 °C, respectively, indicating that 750 °C is the appropriate graphitization temperature .…”