β-Keto phosphonic esters Communication 4. Infrared spectra of the products of the reaction of α-halo ketones with triethyl phosphite and with sodium diethyl phosphite

Abstract

1. Study of the infrared spectra of products of reaction of bromoacetone, of 3-bromo-2-butanone, and of 1-bromo-2-butanone with triethyl phosphite confirmed that they are β-keto phosphonic esters (carbonyl absorption band at 5.84-5.85 μ). 2. The spectra of the products of reaction of bromoacetone and of 3-bromo-2-butanone with sodium diethyl phosphite indicate that they are epoxy phosphonic esters (absence of a carbonyl absorption band and presence of absorption bands characteristic of the epoxy grouping at 11.80 and 11.98 μ, respectively). 3. The infrared spectra do not enable us to come to definite conclusions regarding the occurrence of enolization in the β-keto phosphonic esters studied. © 1960 Consultants Bureau Inc.