The review presents the recent progress made in the field of ionic liquids bearing bioactive components, with a particular emphasis on their use as chemical tools in agriculture and the preservation of agricultural products.
Continuous flow-through reactors on a micro scale (microreactors) are being investigated as a new approach to chemical synthesis, due to larger surface-to-volume ratios and micro-structured internal volumes, which allow for efficient heat exchange.
Utilization of continuous flow chemistry techniques concentrates often on catalytic reactions difficult to be performed for various reasons under typical batch conditions. As a result of the advantages that continuous flow chemistry techniques offer, in regards to solving the problems related to carrying out the reactions in batch systems, microreactors are becoming more and more popular. Herein we present our results for the optimization and intensification of hydrosilylation reactions with three different alkenes. We performed reactions between 1,1,1,3,5,5,5-heptamethyltrisiloxane (HMTS) and 1-octene, 3-allyloxy-1,2-propanediol or allyl glycidyl ether with the Karstedt catalyst in both batch and microreactor systems, where we have monitored the reaction using in situ IR (controlling conversion of Si–H). Application of a microreactor system for performing the hydrosilylation reaction in a significant way allowed the conversion of Si–H bonds to be increased when using all the examined olefins. Especially lengthening of the microreactor system, while maintaining the reactants’ residence time in the microreactor, caused an increase in the Si–H conversion. With no doubt, performing the synthesis of organofunctional silicon compounds in continuous flow microreactor systems has great potential.
Functionalized siloxanes are one of the most important classes of organosilicon compounds, thus the enhancement of current methods of its synthesis is an important issue. Herein, we present the selective and highly effective reaction between 1,1,3,3-tetramethyldisiloxane (TMDSO) and 1-octene (1-oct), using SILP (supported ionic liquid phase) materials containing a rhodium catalyst immobilized in three phosphonium ionic liquids (ILs) differing in the structure of cation. Studies have shown high potential for using SILP materials as catalysts due to their high catalytic activity and selectivity, easy separation process, and the possibility of reusing the catalyst in subsequent reaction cycles without adding a new portion of the catalyst. Using the most active SILP material SiO2/[P66614][NTf2]/[{Rh(μ-OSiMe3)(cod)}2] allows for reuse of the catalyst at least 50 times in an efficient and highly selective monofunctionalization of TMDSO.