prov:value
| - wherein R2 is a hydrogen, a C1-C12 hydrocarbyl group, or a halogen, in the presence of a heterogeneous catalyst and a promoter, wherein the promoter is chlorosulphonic acid, a C1-C12 alkyl sulphonic acid, a C6-C12 aryl sulphonic acid, a C1-C12 alkyl C6-C12 aryl sulphonic acid, a halogenated C1-C12 alkyl sulphonic acid, a halogenated C6-C12 aryl sulphonic acid, a halogenated C1-C12 alkyl C6-C12 ary
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