... Reviews: (c) P. v. R. Schleyer, 20th National Organic Chemistry Symposium of the American Chemical Society, Burlington, Vt., June 1967, Abstracts, pp 5-19; (d) U. Schollkopf, Angew. Chem., Int. Ed. ... Journal of the American Chemical Society / 94:l / January 12, 1972 ...