p-Toluenesulfonic acid → HCID 13066707, compound
Reaction equation
O[C:2]1[C:7]([O:8][C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][C:10]=2[Cl:15])=[CH:6][CH:5]=[CH:4][C:3]=1[CH2:16][C:17]([OH:19])=[O:18].C1(C)C=CC(S(O)(=O)=O)=CC=1>C1C=CC=CC=1>[Cl:15][C:10]1[CH:11]=[CH:12][CH:13]=[CH:14][C:9]=1[O:8][C:7]1[C:2]2[O:19][C:17](=[O:18])[CH2:16][C:3]=2[CH:4]=[CH:5][CH:6]=1Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
A mixture of 2-[2-hydroxy-3-(2-chlorophenoxy)phenyl]acetic acid (1.9 g) and p-toluenesulfonic acid (0.5 g) in benzene 50 ml was treated in a similar manner to that of Example 1-(6), and the residue was recrystallized from a mixture of diethyl ether and n-hexane to give 7-(2-chlorophenoxy)-2,3-dihydrobenzofuran-2-one (1.2 g). mp 118°-120° C.