1. (a) Properties and preparations of cyclic compounds are dealt with in the following literature (la-le), and effects of ring strain on cyclization reactivity are described in Refs. If and 1g: J. Chem. Soc., 420-428 (1950).
2. (b) and Advanced Organic Chemistry, Reinhold, New York (1961), Chapter 15.
3. (c) Stereochemistry of Carbon Compounds, McGraw-Hill, New York (1962).
4. Ring closure reactions of bifunctional chain molecules
5. Cyclization and the conformation of hydrocarbon chains