Structures of two sterically crowded molecular propeller systems

摘要

The crystal structures of two molecular propellers are described. Enol phosphate 1 is triclinic P 1-bar with a = 10.1110(4), b = 12.0647(6), c = 14.2112(7) A; #alpha# = 96.421(3), #beta# = 98.633(3), #gamma# = 108.594(2) deg and Z = 2. Enol phosphinate 2 is monoclinic P2_1 with a = 13.527(3), b = 11.980(2), c = 17.326(3) A, #beta# = 98.616(9), deg and Z = 4. Data from dynamic NMR investigations are in agreement with the size of the aryl torsion angles in the two enol propellers.