The reaction of elemental white phosphorus with N‐alkyl acrylamides and N,N‐dialkyl acrylamides in the presence of a base is described and the physical properties of 8 new tertiary phosphine oxides of general formula (R2NCOCH2CH2)3PO (R = H, CH3, C2H5,(CH2)4, (CH2)5, and C2H4OC2H4, CH2CHCH2) are reported. Interaction of white phosphorus with RNCS, RNCO, azo‐bis‐isobutyronitrile, Ph2NNPh2, vinyl acetate, vinyl ethyl ether, and expoxides has also been investigated.