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Mono- and tri-ester hydrogenolysis using tandem catalysis. Scope and mechanism

Journal Article · · Energy & Environmental Science
DOI:https://doi.org/10.1039/C5EE03256C· OSTI ID:1386764
 [1];  [1];  [2];  [3];  [1]
  1. Northwestern Univ., Evanston, IL (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials

In this work, the scope and mechanism of thermodynamically leveraged ester RC(O)O–R' bond hydrogenolysis by tandem metal triflate + supported Pd catalysts are investigated both experimentally and theoretically by DFT and energy span analysis. This catalytic system has a broad scope, with relative cleavage rates scaling as, tertiary > secondary > primary ester at 1 bar H2, yielding alkanes and carboxylic acids with high conversion and selectivity. Benzylic and allylic esters display the highest activity. The rate law is ν = k[M(OTf)n]1[ester]0[H2]0 with an H/D kinetic isotope effect = 6.5 ± 0.5, implying turnover-limiting C–H scission following C–O cleavage, in agreement with theory. Intermediate alkene products are then rapidly hydrogenated. Applying this approach with the very active Hf(OTf)4 catalyst to bio-derived triglycerides affords near-quantitative yields of C3 hydrocarbons rather than glycerol. From model substrates, it is found that RC(O)O–R' cleavage rates are very sensitive to steric congestion and metal triflate identity. For triglycerides, primary/external glyceryl CH2–O cleavage predominates over secondary/internal CH–O cleavage, with the latter favored by less acidic or smaller ionic radius metal triflates, raising the diester selectivity to as high as 48% with Ce(OTf)3.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Institute for Atom-efficient Chemical Transformations (IACT); Argonne National Laboratory (ANL), Argonne, IL (United States). Laboratory Computing Resource Center (LCRC) and Center for Nanoscale Materials (CNM); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357; AC02-05CH11231
OSTI ID:
1386764
Alternate ID(s):
OSTI ID: 1253016
Journal Information:
Energy & Environmental Science, Journal Name: Energy & Environmental Science Journal Issue: 2 Vol. 9; ISSN EESNBY; ISSN 1754-5692
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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