Journal of Isotopes ›› 2018, Vol. 31 ›› Issue (4): 235-240.

### Syntheses of Stable Isotope ［13C］/D Labelled p-Methoxybenzoic Acid

WANG Wei;DU Xiaoning;XU Jianfei;LEI Wen

1. Shanghai Research Institute of Chemical Industry Co. Ltd, Shanghai Engineering Research Center of Stable Isotope, Shanghai 200062, China
• Online:2018-08-20 Published:2018-07-04

### 稳定同位素13C或D标记对甲氧基苯甲酸的合成

1. 上海化工研究院有限公司 上海稳定性同位素工程技术研究中心，上海200062

Abstract:

Stable isotope labelled p-methoxybenzoic acid is an important intermediate in the synthesis of stable isotope labelled preservative, anti-microbial, anti-fungal, spices, and other internal standard reagentsspices, drugs and other compounds. A new procedure for the synthesis of the ［13C］/D labelled p-methoxybenzoic acid has been developed in this paper. The stable isotope ［13C］/D labelled p-methoxybenzoic acid was synthesized from ethyl paraben and ［13C］/D labelled iodomethane (13CH3I or CD3I) under alkaline conditions via two steps. In this paper, the optimal reaction temperature, molar ratio, and reaction time were obtained by single factor experiment. The optimal reaction conditions were obtained as follows, the reaction temperature was 80 ℃, the molar ratio of ［13C］/D labelled iodomethane to ethyl paraben was 1.15∶1, the reaction time was 6 h. In the optimization conditions, the yield of ［13C］ labelled p-methoxybenzoic acid was 91.12%, and the utilization of 13CH3I was 79.32%. The melting point of product was 186.5~187.8 ℃. The product analyses were made with LC-MS, the chemical purity was 99.1%, and the isotopic abundance was 99.0 atom%13C. The qualitative analysis of product was confirmed by 1H NMR. By the same technological conditions, the stable isotope ［D］ labelled p-methoxybenzoic acid was synthesized from ethyl paraben and ［D］ labelled iodomethane (CD3I). The yield of ［D］ labelled p-methoxybenzoic acid was 90.49%, and the utilization of CD3I was 78.70%, and the melting point of product was 186.3~188.1 ℃. The product analyses were made with LC-MS, the chemical purity was 99.0%, and the isotopic abundance was 98.1 atom%D. The qualitative analysis of product was confirmed by 1H NMR.