A ¹³C NMR Study of Formaldehyde
in 1,2-Propylene Glycol Solution

A. L. Balashov*, S. M. Danov*, V. L. Krasnov*, A. Yu. Chernov*,
A. N. Ponomarev**, and I. A. Borisova**

* Nizhnii Novgorod State Technical University (Dzerzhinsk Branch), Dzerzhinsk
** AO Kaprolaktam, Dzerzhinsk

Received March 22, 1996

Abstract—The ¹³C NMR technique is used to study the composition of formaldehyde solution in propylene
glycol at 90°C in the range of formaldehyde concentrations from 0 to 10 mol/l. There are three types of
hemiformals in solution: H(OCH₂)_nOCH₂CH(CH₃)OH, HOCH₂CH(CH₃)O(CH₂O)_kH, and
H(OCH₂)_jOCH₂CH(CH₃)O(CH₂)_mH. It is found that the primary HO group of propylene glycol is more reac-
tive than the secondary one with respect to the carbonyl group of formaldehyde.

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