Abstract
A combined chemical and mathematical approach was used to study the reduction process of 4-benzyloxy-4′-chlorochalcone involving catalytic transfer hydrogenation with ammonium formate and palladium on carbon. Several solvents were investigated to evaluate the effect of solvent-type on competitive reduction rates. A mathematical model based on Michaelis–Menten reaction kinetics was developed using a least squares approximation method to estimate several model parameters according to time-dependent reduction data. The conjugated alkene was found to reduce fastest in all solvents except alcohols, which is likely related to the solvent’s ability to support partially-charged intermediate species in the RDS of aryl chloride hydrogenolysis. Substrate concentration and pH dependence of the reduction were also investigated to confirm prior mechanistic findings. Hydrogen transfer from the formate to palladium appears to be rate determining in multiple reactions. Also, catalyst poisoning by HCl may affect aryl chloride reduction more significantly than reduction of other functionalities.
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We would like to acknowledge Jeremy Martin, Tumare Iqbal, leaders/participants from the 2010 CWCS Teaching Guided-Inquiry Organic Chemistry Labs Workshop and C344 students from 2011-2013 for their valuable contributions to this work.
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Nguyen, T., Arciero, J., Piltz, J. et al. Kinetic study of competitive catalytic transfer hydrogenation on a multi-functional molecule: 4-benzyloxy-4′-chlorochalcone. Reac Kinet Mech Cat 111, 1–14 (2014). https://doi.org/10.1007/s11144-013-0627-5
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DOI: https://doi.org/10.1007/s11144-013-0627-5