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The diphosphenyl complex (η5 -C5Me5)(CO)2Fe -P = P -Mes* (1) (Mes* = 2,4,6tBu3C6H2) reacts with equimolar amounts of the azo compounds R(O)C -N = N - C(O)R (2a: R = OEt; 2b: R = O-tBu; 2c: R = OCH2C6H5; 2d: R = NC5H10) in a cheletropic [1 +4] cycloaddition to afford stereoselectively the metal substituted oxadiazaphospholenes The products have been characterized by elemental analysis as well as by spectroscopic data (IR, 1H, 13C, 31P NMR, MS). The molecular structure of 3a has been elucidateddoi:10.1515/znb-1992-0214 fatcat:emedaj4iq5bz5d3mdulx7fp4nm