Cyclization and annulation reactions of nitrogen-substituted cyclopropanes and cyclobutanes
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Abstract: Activated cyclopropanes, such as vinyl and carbonyl cyclopropanes, are useful building blocks in organic chemistry due to their exceptional reactivity. This review focuses on the use of cyclopropyl carbonyls and imines in cyclization and cycloadd ...
The first catalytic method for the cyclization of vinyl-cyclopropyl ketones (formal homo-Nazarov reaction) is reported. Starting from activated cyclopropanes, heterocyclic and carbocyclic compounds were obtained under mild conditions using Brønsted acid ca ...
The Ag ion-catalyzed ring-opening of a 1:4 mixt. of syn- and anti-cyclopropanes I and II gave the expected mixt. of CH2:CFC(OH)MeCMe3 and (Z)-MeC(CMe3):CFCH2OH in 56 and 19% yield, resp. Under similar conditions spiro analog. III underwent Wagner-Meerwein ...
Real-world vanadium-based catalysts for the selective catalytic reduction (SCR) of NO with NH3 are occasionally exposed to high temperatures, which can induce catalyst aging. In this work, a 2.0 wt% V2O5/WO3-TiO2 catalyst based on commercial WO3-TiO2 was l ...