已知:①BrR1 →THFMg BrMgR1 →BrR2 R1﹣R2(THF为一种有机溶剂)
②C6H5﹣O﹣R ①Li,THF,室温②H3O+ C6H5﹣OH
请回答下列问题:
classroom building is tall.How about ?
Suddenly, a light ____ ____. I saw a man in black standing in front of me.