最近做一吡啶鎓盐的合成，文献报道反应时长在8-10h，但我反应了两天反应物还有很多，各位可以帮忙解决一下吗，谢谢！！！
A solution of equal mumber of moles of 4-(2-bromoethyl) benzophenone and picolyl ester 7 in MeCN (40 mL) was refluxed at 85°C for 8- 10 h. The solvent was evaporated and the residue was dried under vacuum


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