Blanc Reaction-Blanc Rule.
H. G. Blanc, Compt. Rend. 144, 1356 (1907)
F. Klages, Lehrbuch der organischen Chemie 1, 455 (Berlin, 1952)
L. F. Fieser and M. Fieser, Advanced Organic Chemistry, p 571
(New York, 1961)
Also see: Ruzicka Large Ring Synthesis