A process for the manufacture of an epoxyethyl carboxylate or glycidyl carboxylate, comprising: reacting a vinyl carboxylate or an allyl carboxylate wherein the allyl carboxylate is represented by an ester of the following formulae: R(C OCH 2 CH=CH 2) n, wherein R is a mono or polyvalent radical of 5 or more carbon atoms, wherein R optionally contains 1 or more heteroatoms, wherein n corresponds to the number of ester groups, and wherein n is an integer of 1 or greater, using an oxidant and a water-soluble manganese complex in an aqueous reaction medium, wherein the water-soluble manganese complex is an oxidation catalyst, characterized in that the water-soluble manganese complex comprises: a binuclear species of the general formula: [LMn(μ-X) 3 Mn]Y n', wherein Mn is a manganese; L or each L independently is a polydentate ligand wherein each polydentate ligand is independently selected from acyclic compounds containing at least 7 atoms in the backbone or cyclic compounds containing at least 9 atoms in the ring, wherein each polydentate ligand having 3 nitrogen atoms with the nitrogen atoms separated by at least two carbon atoms.; and each μ-X is independently a bridging coordinating species, selected from the group consisting of: RO -, Cl -, Br -, I -, V -, NCS -, N 3 -, I 3 -, NH 3, NR 3, RCOO -, RSO 3 -, RSO 4 -, OH -, O 2-, O 2 2 -, OH -, H 2 O, SH -, CN -, OCN -, and S 4 2- and combinations thereof, wherein R is a C 1 -C 20 radical selected from the group consisting of alkyl, cycloalkyl, aryl, benzyl and combinations thereof, and Y is a non-coordinating counter ion selected from CH 3 COO - or PF 6 -, n' is 1 or 2 and wherein the epoxidation is carried out at a pH in the range of from 1.0 to 7.0. reacting a vinyl carboxylate or an allyl carboxylate wherein the allyl carboxylate is represented by an ester of the following formulae: R(C OCH 2 CH=CH 2) n, wherein R is a mono or polyvalent radical of 5 or more carbon atoms, wherein R optionally contains 1 or more heteroatoms, wherein n corresponds to the number of ester groups, and wherein n is an integer of 1 or greater, using an oxidant and a water-soluble manganese complex in an aqueous reaction medium, wherein the water-soluble manganese complex is an oxidation catalyst, R(C OCH 2 CH=CH 2) n, wherein R is a mono or polyvalent radical of 5 or more carbon atoms, wherein R optionally contains 1 or more heteroatoms, wherein n corresponds to the number of ester groups, and wherein n is an integer of 1 or greater, using an oxidant and a water-soluble manganese complex in an aqueous reaction medium, wherein the water-soluble manganese complex is an oxidation catalyst, characterized in that the water-soluble manganese complex comprises: a binuclear species of the general formula: [LMn(μ-X) 3 Mn]Y n', a binuclear species of the general formula: [LMn(μ-X) 3 Mn]Y n', wherein Mn is a manganese; L or each L independently is a polydentate ligand wherein each polydentate ligand is independently selected from acyclic compounds containing at least 7 atoms in the backbone or cyclic compounds containing at least 9 atoms in the ring, wherein each polydentate ligand having 3 nitrogen atoms with the nitrogen atoms separated by at least two carbon atoms.; and each μ-X is independently a bridging coordinating species, selected from the group consisting of: RO -, Cl -, Br -, I -, V -, NCS -, N 3 -, I 3 -, NH 3, NR 3, RCOO -, RSO 3 -, RSO 4 -, OH -, O 2-, O 2 2 -, OH -, H 2 O, SH -, CN -, OCN -, and S 4 2- and combinations thereof, wherein R is a C 1 -C 20 radical selected from the group consisting of alkyl, cycloalkyl, aryl, benzyl and combinations thereof, and Y is a non-coordinating counter ion selected from CH 3 COO - or PF 6 -, n' is 1 or 2 and wherein the epoxidation is carried out at a pH in the range of from 1.0 to 7.0.