“…However, no intramolecular dehydration occurs 9 as observed in the reaction of N-acyl and NPO(OH)21 PO2HQPO(OH)2Benzoylhydrazine reacts with P4OJ0 with phosphorylation of the terminal nitrogen. This is followed by a reversible rearrangement (1-4 shift) to give a mixture of O 2. The reaction of P4O10 and esters of monosubstituted acetic acid leads to the elimination of alcohol and gives monosubstituted ketenes that trimerise spontaneousely to give polysubstituted benzenes -Ar,CN, NO2; Z = H,PO(0H) 2> PO(OH)OPO(OH)2…”