求反应机理。光催化不饱和酮的自由基是怎么生成的？为什么要用醋酸作为溶剂，不能用别的吗？还请做自由基方面的大牛可以解析一下过程，万分感谢！实验步骤：A solution of santonin (1) (9.5 g, 38.6 mmol) in 140 mL of glacial acetic acid was irradiated under argon with a 150 W medium-pressure
mercury lamp housed in an refrigerated quartz immersion tube until complete reaction of santonin as determined by 1H NMR analysis of an aliquot.quartz immersion tube是什么东东？还望有经验的不吝告知，多谢！！


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