Synthesis of the First
A "true" allenophane with several rings and allenic bridges was synthesized. The key step in the preparation of 1 was the cyclization to a 28-membered macrocycle (52 % yield) starting from a linear molecule, which already contains three of the four allene units.
Thorand
S
Institut für Organische Chemie und Biochemie der Universität, Gerhard-Domagk Strasse 1, D-53121 Bonn (Germany).
Vögtle
F
Krause
N