Process for the preparation of tris(N-carbalkoxylaminomethyl)phosphine oxides and sulfides

摘要

The title compounds, having the formula (RO2CNHCH2)3PY where Y=oxygen or sulfur, are prepared by reacting a tetrakis(N-carbalkoxylaminomethyl)phosphonium salt having the formula (RO2CNHCH2)4P+X- with ammonia or a primary or secondary amine, followed by an oxidizing or sulfurizing agent. The products, after methylolation with formaldehyde, are useful as finishing agents for imparting flame retardant properties to cotton fabrics.