• Corey, E.M. and Varma, R.K., J. Am. Chem. Soc. , 93 : 1491, (1971).
• Protection of the OH group of a non-crystalline prostaglandin intermediate, in the presence of pyridine, enabled isolation as the crystalline 4-phenylbenzoate ester: J. Am. Chem. Soc., 93, 1491 (1971). For protection of 3-azido-2,3-dideoxypentoses in a short AZT synthesis, see: Synthesis, 451 (1991). Again, the solid nature of these intermediates facilitates isolation.
• Protection of amines as their crystalline 4-phenylbenzamides has also been recommended. These amides can be cleaved with sodium amalgam: Tetrahedron Lett., 3853 (1976).