Iron, Cobalt and Nickel Catalyzed Hydrosilylative Reduction of Functional Groups

: Hydrosilylation is an important transformation in organic synthesis. It has displayed widespread applications in homogenous catalysis and in the commercial production of organosilanes and organosilicon compounds. Though metals like Ru, Rh etc were used widely for achieving hydrosilylation, the increasing environmental concerns and the search for less expensive alternatives resulted in the investigation of transition metals. Metals like Ni, Co etc exhibit potential cost benefits, in addition to their low CO2 foot print and lower toxicity. Thus, transition metal catalysis has emerged as a promising strategy for hydrosilylation. This comprehensive review discusses the catalytic hydrosilylation of various functional groups with non-noble transition metals such as iron, cobalt and nickel in the last decade. Here, the topic is categorized based on the substrate functional groups such as aldehydes, ketones, alkenes, etc.

Morphology of the surface of d-transition metal alloys of the IV period after CBN grinding

Studies have been carried out when grinding alloys based on titanium, vanadium, chromium, iron, cobalt and nickel. According to the condition of the neat surface, the alloys are divided into groups. The regularities of changes in the roughness parameters of Ra and Rsm are investigated. The parameter of the average density of the peaks of the grains forming the elements of the surface roughness profile has been introduced, the relationship of the introduced parameter with Ra is shown. It is established that when grinding all alloys, the treated surface is impregnated by the wear products of the abrasive tool. Electronic photographs of objects are given. The possible sizes of embedded crystals are determined.