prov:value
| - Dehydration to the unsaturated intermediate compound 5-3 can be achieved with selenium dioxide (Lee, J. G. et al, Tetrahedron Lett, 33, pp. 6363-6366 (1992)), or a catalyst such as palladium, platinum in a solvent, such as, for example, xylene, at the boiling temperature of the solvent (Soerens, D. et al., J. Org.
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