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2. Worldwide production capacities for ethylene glycol in 1995: 9.7 Mio to/a; worldwide production of 1,2-propylene glycol in 1994: 1.1 Mio to/a; K. Weissermel, H.J. Arpe, Industrielle Organische Chemie, Wiley-VCH, Weinheim, 5th edn., 1998, pp. 167 and 302.
3. (a) H.H. Szmant, Organic Building Blocks of the Chemical Industry, Wiley, New York, 1989, p. 347.
4. (b) G. Pohl, H. Gaube, in: Ullmann's Encyclopedia of Industrial Chemistry, vol. A1, VCH, Weinheim, 1985, p. 305.
5. (a) M. Schröder, Chem. Rev. 80 (1980) 187.