Possibility of interaction of nitrilotrimethylphosphonic acid with pentaphenylantimony

Pentaphenylantimony in benzene solution does not react with nitrilotrimethylphosphonic acid. The reaction progress was monitored by thin-layer chromatography (TLC), which was carried out in a benzene-heptane solution (1:3 vol.), the TLC plate was developed in iodine vapor. Heating (1 h, 80°C) of the reaction mixture containing pentaphenylantimony and nitrilotrimethylphosphonic acid in a benzene solution did not lead to disappearance of the initial pentaphenylantimony spot. Moreover, after heating only the initial reagents were isolated from the reaction mixture.