Photoreduction, in the presence of ascorbic acid and diazabicyclo[2.2.2.]octane, of zinc(II) vinylporphyrins, affords vinylchlorins in which the macrocyclic double bond in the pyrrole subunit bearing the vinyl group is regioselectively cis-reduced; when a vinylporphyrin bearing a more strongly electron-withdrawing methoxycarbonyl group is photoreduced, the ester-bearing ring is regioselectively reduced
锌(II)
乙烯基卟啉在
抗坏血酸和二
氮杂双环[2.2.2。]
辛烷存在下进行光还原,可得到
氯乙烯,其中带有
乙烯基的
吡咯亚基中的大环双键区域选择性地被顺式还原;当带有更强吸电子甲氧基羰基的
乙烯基卟啉被光还原时,带酯的环被区域选择性地还原。