作者:Ralph Vinken、Burkhard Schmidt、Andreas Schäffer
DOI:10.1002/jlcr.641
日期:2002.12
The ring-14C-labelled p-nonylphenol (NP) isomers 4(3′,5′-dimethyl-3′-heptyl)-phenol (p353NP), 4(3′,6′-dimethyl-3′-heptyl)-phenol (p363NP) and 4(2′,6′-dimethyl-2′-heptyl)-phenol (p262NP) were synthesized for application in metabolism and sorption studies. Friedel–Crafts alkylation of 14C-labelled phenol and the corresponding tertiary nonylalcohol with BF3 as catalyst was used. After clean-up of p262NP and p363NP by preparative thin-layer chromatography radiochemical yields amounted to 62.8 and 64.6%, specific radioactivities were 332 and 88.2 MBq/mmol, and radiochemical purities 97.6 and 99.0%. For both isomers, a large-scale synthesis with non-labelled phenol was additionally developed, which led to pure products (96 and 99%, respectively) without further purification steps. In the case of p353NP, which was formed as a diastereomeric mixture, the crude synthetic product had a radiochemical purity of 96.9% (radiochemical yield: 76.0%; specific activity: 298 MBq/mmol); thus, purification was not necessary. All products were characterized by means of gas chromatography-mass spectroscopy, 1H- and 13C-NMR, as well as IR. Copyright © 2002 John Wiley & Sons, Ltd.
三种带有14C标记的对壬基酚(NP)异构体被合成,用于代谢和吸附研究:
- 4(3',5'-二甲基-3'-庚基)-酚(p353NP)
- 4(3',6'-二甲基-3'-庚基)-酚(p363NP)
- 4(2',6'-二甲基-2'-庚基)-酚(p262NP)
合成方法是使用BF3作为催化剂,对14C标记的酚和相应的叔壬醇进行傅-克烷基化反应。
通过制备薄层色谱纯化后:
- p262NP放射化学产率为62.8%,比活度332 MBq/mmol,放射化学纯度97.6%
- p363NP放射化学产率为64.6%,比活度88.2 MBq/mmol,放射化学纯度99.0%
另外还开发了这两种异构体使用非标记酚的大规模合成方法,无需进一步纯化即可得到纯度分别为96%和99%的产品。
p353NP作为非对映异构体混合物生成,粗产品的放射化学纯度为96.9%(放射化学产率76.0%,比活度298 MBq/mmol),因此无需纯化。
所有产物均通过气相色谱-质谱、1H-NMR、13C-NMR和IR进行表征。