20858-29-1

Basic information

• Product Name: Phosphonic acid, phenyl-, bis(4-chlorophenyl) ester
• CAS NO: 20858-29-1
• Molecular Formula: C18H13Cl2O3P
• Mol File: 20858-29-1.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: Phosphonic acid, phenyl-, bis(4-chlorophenyl) ester(CAS DataBase Reference)
• NIST Chemistry Reference: Phosphonic acid, phenyl-, bis(4-chlorophenyl) ester(20858-29-1)
• EPA Substance Registry System: Phosphonic acid, phenyl-, bis(4-chlorophenyl) ester(20858-29-1)

Safety Data

• Hazardous Substances Data: 20858-29-1(Hazardous Substances Data)

Upstream product

• 38873-91-5 bis(4-nitrophenyl) phenylphosphonate 
• 106-48-9 4-chloro-phenol 

Relevant articles and documents

Nonlinear Broensted Relationships in the Reaction of Phenoxide Ions with Bis(4-nitrophenyl) Phenylphosphonate in H2O-Me2SO Mixtures. Solvation Effects

The second-order rate constants (kArO) for reaction of substituted phenoxide ions with bis(4-nitrophenyl) phenylphosphonate in aqueous as well as vatious aqueous dimethyl sulfoxide (Me2SO) mixtures are reported.Traditional Broensted plots of log kArO vs pKArOHa are linear at low pKArOHa but show very strong downward curvature at high pKArOHa.In each solvent, the break point in the Broensted plot occurs at a pKArOHa value which is much higher than that corresponding to the basicity of the leaving p-nitrophenoxide ion, suggesting that the observed levelling off does not reflect a change in the identity of the rate-determining step in a two-step process involving formation of a pentacoordinate intermediate.An analysis of the data on the basis of a novel strategy recently designed by Buncel and co-workers for the construction of Broensted plots in solvent mixtures confirms this conclusion.It is proposed that the curvature in the traditional Broensted plots is the reflection of strong imbalances in the transition states of the reactions, and it is suggested that these imbalances are essentially of solvational nature.