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醛和1.2当量 NBS 于 CCl_4中,加催化量 AIBN 后加热搅拌反应12min,生成的酰溴不予分离,冷却至0℃,直
Aldehyde and 1.2 NBS in CCl_4, add the catalytic amount of AIBN catalytic reaction 12min, the resulting acid bromide not be isolated, cooled to 0 ° C, straight