224575-61-5

Basic information

• Product Name: Phosphonic acid, [1-[(1,1-dimethylethyl)(phenylmethoxy)amino]-2,2-dimethylpropyl]-, diethyl ester
• CAS NO: 224575-61-5
• Molecular Formula: C20H36NO4P
• Molecular Weight: 385.484
• Mol File: 224575-61-5.mol
• Article Data: 3

Chemical Properties

• CAS DataBase Reference: Phosphonic acid, [1-[(1,1-dimethylethyl)(phenylmethoxy)amino]-2,2-dimethylpropyl]-, diethyl ester(CAS DataBase Reference)
• NIST Chemistry Reference: Phosphonic acid, [1-[(1,1-dimethylethyl)(phenylmethoxy)amino]-2,2-dimethylpropyl]-, diethyl ester(224575-61-5)
• EPA Substance Registry System: Phosphonic acid, [1-[(1,1-dimethylethyl)(phenylmethoxy)amino]-2,2-dimethylpropyl]-, diethyl ester(224575-61-5)

Safety Data

• Hazardous Substances Data: 224575-61-5(Hazardous Substances Data)

Upstream product

• 2154-56-5 benzyl radical 
• 188526-94-5 N-(2-methyl-2-propyl)-N-(1-diethylphosphono-2,2-dimethylpropyl)aminoxyl 
• 100-39-0 benzyl bromide 

Downstream Products

• 2154-56-5 benzyl radical 
• 188526-94-5 N-(2-methyl-2-propyl)-N-(1-diethylphosphono-2,2-dimethylpropyl)aminoxyl 

Relevant articles and documents

Factors influencing C-ON bond homolysis in alkoxyamines: Unexpected behavior of SG1 (N-(2-methyl-2-propyl)-N-(1-diethylphosphono-2,2-dimethylpropyl) -N-oxyl)-based alkoxyamines

Alkoxyamines and persistent nitroxides are important regulators of nitroxide-mediated radical polymerization (NMP). Since the polymerization time decreases with the increasing equilibrium constant K (kdk c), i.e., the increasing rate constant kd of the homolysis of the C-ON bond between the polymer chain and the nitroxide moiety, the factors influencing the cleavage rate constants are of considerable interest. SG1-based alkoxyamines have turned out to be the most potent alkoxyamine family to use for NMP of various monomers. Therefore, it is of high interest to determine the factors which make SG1 derivatives better regulators than TEMPO (2,2,6,6-tetramethylpiperidine-N-oxyl) derivatives. Contrary to what we had observed with TEMPO derivatives, we observed two relationships for the plot Ea vs BDE(C-H), one for the nonpolar released alkyl radicals (E a (kJ/mol) = -133.0 + 0.72BDE) and the other one for the polar released alkyl radicals (Ea (kJ/mol) = -137.0 + 0.69BDE). However, for both families (SG1 and TEMPO derivatives), the rate constants kd of the C-ON bond homolysis were correlated to the cleavage temperature T c (log(kd(s-1)) = 1.51 -0.058Tc). Such correlations should help to design new alkoxyamines to use as regulators and to improve the tuning of NMP experiments.

Entropy control of the cross-reaction between carbon-centered and nitroxide radicals

Absolute rate constants for the cross-coupling reaction of several carbon-centered radicals with various nitroxides and their temperature dependence have been determined in liquids by kinetic absorption spectroscopy. The rate constants range from 5 M-1 s-1 to 2.3 × 109 M-1 s-1 and depend strongly on the structure of the nitroxide and the carbon-centered radical. Grossly, they decrease with increasing rate constant of the cleavage of the corresponding alkoxyamine. In many cases, the temperature dependence shows a non-Arrhenius behavior. A model assuming a short-lived intermediate that is hindered to form the coupling product by an unfavorable activation entropy leads to a satisfactory analytic description. However, the behavior is more likely due to a barrierless single-step reaction with a low exothermicity where the free energy of activation is dominated by a large negative entropy term.