Identifying purity of the synthesized 1,1,1-trichloro-3-methyl-3-phospholene by four methods including the conductance titration, potentiometric titration, differential potentiometric and UV spectroph

The purity of 1,1,1-trichloro-3-methyl-3-phospholene (TCMP) is considered important in its reaction with methanol for the preparation of 1-methoxy-3-methyl-2-phospholene oxide (MMPO) as an flame retardant. Additionally, in the kinetics studies of the reaction between TCMP and methanol it was highly necessary to identify the purity of the prepared TCMP for obtaining meaningful kinetic parameters. For this purpose, the experimental procedure, based upon the approach detailed in colemanʹs work, was used for the synthesis of TCMP. This work surveys the methods of analysis used for identifying purity of the synthesized TCMP. These procedures involve conductance titration, potentiometric titration, differential potentiometric and UV spectrophotometer methods. The conductance titration experiments for the measurement of HCl generated in the reaction between TCMP and water showed that the end point was overestimated due to interference. But, the results obtained from the UV spectrophotometer, potentiometric and differential titration experiments were much more reliable and also a good demonstration of the high purity of the prepared TCMP.