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7a: Ar = −C6H5, Ar′ = −C6H5; 7b: Ar = −C6H5, Ar′ = 4-Cl–C6H4; 7c: Ar = −C6H5, Ar′ = 4-Br–C6H4; 7d: Ar = 4-CH3O–C6H4, Ar′ = −C6H5; 7e: Ar = 4-CH3O–C6H4, Ar′ = 4-Cl–C6H4; 7f: Ar = 4-CH3O–C6H4, Ar′ = 4-Br–C6H4; 7g: Ar = 4-Cl–C6H4, Ar′ = −C6H5; 7h: Ar = 4-Cl-C6H4, Ar′ = 4-Cl–C6H4; 7i: Ar = 4-Cl–C6H4, Ar′ = 4-Br–C6H4; 7j: Ar = 4-H3C–C6H4, Ar′ = −C6H5; 7k: Ar = 4-H3C–C6H4, Ar′ = 4-Cl–C6H4; 7l: Ar = 4-H3C–C6H4, Ar′ = 4-Br–C6H4.
