denoted as Cu/HT (c), which acted as a highly efficient heterogeneous catalyst for oxidant-
free lactonization of various diols under liquid-phase conditions. The Cu/HT (c) catalyst
could be recovered by simple filtration and reused without the significant loss of its activity
and selectivity. Lactones are important as components of flavors, medicines, and solvents,
and as synthetic intermediates for herbicides and rubbers. 1 Among many approaches to the …