New Catalyst for Phosphonylation of C=X Electrophiles. -A wide range of aldehydes, ketones, imines, iso(thio)cyanates and alkenes readily undergoes phosphorylation with trialkylphosphite in the presence of pyridinium perchlorate. The advantages of the procedure are operational simplicity, wide substrate scope, good yields and recycability of the catalyst. -(KOLODIAZHNYI*, O. I.; KOLODIAZHNA, O. O.; Synth. Commun. 42 (2012) 11, 1637-1649, http://dx.