Organophosphorus Compounds, Part 153; New Phosphorus-Carbon Cage Compounds by Diels - Alder and Homo Diels - Alder Reactions of 1,3,5-Triphosphabenzenes with Alkynes
Eleven new phosphorus-carbon cagecompounds 3a-d, 5a-e, 7, and 8 have been synthesized in mostly excellent yields by reactions of the 1,3,5-triphosphabenzenes 1 with acetylene, several monosubstituted acetylenes, and cyclooctyne. While most of the alkynes react with the heterobenzenes 1 in a sequence of Diels-Alder and homo Diels-Alder reactions to furnish the cage-compounds 3a-d, 5a-e, and 7 with