1. A few publications have begun to appear which devote themselves to the theoretical problems of synthesis design and are listed chronologically as Refs. 2–17).
2. Corey, E. J.: Pure Appl. Chem., 14, 19 (1967).
3. Velluz, L., Valls, J., Mathieu, J.: Angew. Chem. Intern. Ed. Engl. 6, 778 (1967).
4. Corey, E. J., Wipke, T.: Science 166, 178 (1969).
5. Ireland, R.E.: Organic synthesis. Prentice-Hall 1969.