The successful syntheses and characterizations of the novel bicyclic CP heterocycles 1, 1, 5, 5, 8-pentamethylphosphalilolidine (3) and 1, 1, 6, 6, 8-pentamethylphosphajulolidine (4) are described. Cyclization of 1-(methyl-p-tolylphosphinoyl)-3-methylbutan-2-01 (7) by using polyphoephoric acid at 120 “C produced an inseparable, isomeric mixture (83% yield) of 1, 4, 4, 7-and 1, 4, 4, 6-tetramethylphosphinoline oxides (8 and 9) in ratio of ca. 3: l. This ...
