POCl3-induced dehydration of 3,3'-methylenedi(2-arylamino-4 H-chromen-4-ones) gives 6,8-diarylimino-7 H-pyrano[3,2- c:5,6- c’]dicoumarins, which undergo chemoselective hydrolysis of the imino function to form 7 H-pyrano[3,2- c:5,6- c’]dicoumarins by heating with HCl in methanol However, cleavage of the ether function occurs upon heating in acetic acid to give 3,3'-methylenedi(2-arylamino-4 H-chromen-4-ones).
POCl3 诱导的 3,3'-亚甲基二(2-芳基氨基-4 H-色烯-4-酮)脱水生成 6,8-二亚氨基-7 H-吡喃并[3,2-c:5,6-c']二香豆素:不过,在乙酸中加热时,醚功能会发生裂解,生成 3,3'-亚甲基二(2-芳基氨基-4 H-色烯-4-酮)。