18082-95-6Relevant academic research and scientific papers
Carbosilane dendrimeric carbodiimides: Site isolation as a lactamization tool
Amore, Alessia,Van Heerbeek, Rieko,Zeep, Niek,Van Esch, Jan,Reek, Joost N. H.,Hiemstra, Henk,Van Maarseveen, Jan H.
, p. 1851 - 1860 (2006)
The convergent syntheses of three generations of carbosilane dendrimeric carbodiimides are described. The wedge-type building blocks were synthesized in a divergent way, starting from allyl chloride and a repetitive sequence of hydrosilylation with HSiCl3 and a Grignard reaction with allylmagnesium bromide. Hydrogenation of the terminal double bonds led to inert and stable wedges. The chloride substitutent at the focal point was transformed into several functional groups that eventually led to dendrimeric structures with a carbodiimide core. The extent of the site isolation effect of the dendrimers was studied with dilution experiments monitored by FT-IR spectroscopy on the corresponding dendrimeric ureas. These studies showed that only the first generation self-aggregates via hydrogen bonding, while the second and the third do not, implying isolation of core-bound moieties. The dendrimeric carbodiimides mediated lactamization reactions to obtain homodiketopiperazines.
The synthesis and the chemical and physical properties of non-aqueous silylamine solvents for carbon dioxide capture
Rohan, Amy L.,Switzer, Jackson R.,Flack, Kyle M.,Hart, Ryan J.,Sivaswamy, Swetha,Biddinger, Elizabeth J.,Talreja, Manish,Verma, Manjusha,Faltermeier, Sean,Nielsen, Paul T.,Pollet, Pamela,Schuette, George F.,Eckert, Charles A.,Liotta, Charles L.
, p. 2181 - 2187 (2012)
Silylamine reversible ionic liquids were designed to achieve specific physical properties in order to address effective CO2 capture. The reversible ionic liquid systems reported herein represent a class of switchable solvents where a relatively non-polar silylamine (molecular liquid) is reversibly transformed to a reversible ionic liquid (RevIL) by reaction with CO2 (chemisorption). The RevILs can further capture additional CO2 through physical absorption (physisorption). The effects of changes in structure on (1) the CO2 capture capacity (chemisorption and physisorption), (2) the viscosity of the solvent systems at partial and total conversion to the ionic liquid state, (3) the energy required for reversing the CO2 capture process, and (4) the ability to recycle the solvents systems are reported.
Structure-Property Relationships of Silylamine-Type Reversible Ionic Liquids for Use as a Switchable Electrolyte
Jung, Sungyup,Podder, Showmik,Chen, Josephine,Biddinger, Elizabeth J.
, (2021/04/23)
Switchable electrolytes, whose properties (i.e., conductivity and polarity) can be switched dramatically are very useful. They can address problems associated with multiple electrochemical systems: (1) the need to separate products from the electrolyte after electro-organic syntheses, and; (2) the desire to stop the acceleration of electrochemical reactions in energy storage devices during thermal excursions. Silylamine-type reversible ionic liquids (RevILs) in co-solvents were used as switchable electrolytes in this work. The silylamine RevILs in co-solvents can have a dramatic change in conductivity when switching from a RevIL state to a molecular liquid (state) when heat is applied. The silylamines also have significant changes in polarity with switching. The fundamental silylamine structure-property relationships that can be tuned to control relevant properties such as conductivity, viscosity, thermal switch temperature, and solubility were investigated. In addition, these silylamine RevILs were tested with the addition of metal salts, which were found to increase the conductivity in both the RevIL and ML states. By tailoring the silylamine RevIL structures, the thermo-physical properties for the electrochemical application can be met.
