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前文我们曾报道异戊烷在三氟醋酸(TFAA)——硫酸(90∶10)溶液中,进行光氯化的结果。出于意料的是,产物中只有伯位和仲位的氯代异戊烷而没有叔位取代物。我们认为这是由于叔位氯化物在三氟醋酸和硫酸存在下,当形成时立即转化,部分变成三氟醋酸异戊酯,部分变成异戊烯或其聚合物。
We have previously reported the result of photo-chlorination of isopentane in trifluoroacetic acid (TFAA) -sulfuric acid (90:10) solution. Unexpectedly, the product had only primary and secondary chloroisopentanites without tertiary substitutions. We think this is due to the tertiary chlorides converted immediately upon formation in the presence of trifluoroacetic acid and sulfuric acid, partly as isoamyl trifluoroacetate and partly as isoamylene or as its polymer.