Reaction products of primary β‐hydroxy‐amines with carbonyl compounds. I. The infrared absorption of acetals and ketals

Abstract

Abstract The infrared absorption curves of 18 acetals and ketals have been measured in the region 1070–1190 cm −1. The C—O—C band at 1130 cm −1 (ethers) is split in the case of acetals and ketals (C‐O‐C‐O‐C) into three branches: at 1158—1190 cm −1 at 1124—1143 cm −1 and at 1063—1098 cm −1. The molecular extinction coefficient of the last band is 2—5.104. A fourth band appears in the region 1038—1056 cm −1. A tentative explanation of the observed effects is given. Another characteristic band, at 1110 cm −1 appears only in the spectra of acetals, not in those of ketals, and may be related to a C—H deformation, perturbed by a neighbouring O—C bond.