We report herein a new heterogeneous catalytic system for dehydrogenative lactonization of various diols under solvent-free and acceptor-free conditions using 1 mol% of Pt-loaded SnO2, providing the first successful example of acceptorless lactonization of 1,6-hexanediol to ε-caprolactone by a heterogeneous catalyst.
A. S. Touchy and K. Shimizu, RSC Adv., 2015, 5, 29072 DOI: 10.1039/C5RA03337C
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