| http://www.w3.org/ns/prov#value | - in the presence of a base, for example an organic amine such as an alkylamine, e.g. triethylamine, or an aromatic amine, e.g. pyridine, at a temperature from around ambient to the reflux temperature [see for example Chan, D. T. et al., Tetrahedron Letters, 1998, 2933; Lam, P. Y. S. et al., Tetrahedron Letters, 2001, 3415].
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