... All reagents were purchased from Aldrich Chemical Co ... 20 mmol) in dry CH 2 Cl 2 (100 ml) under an argon atmosphere at room temperature were added methyl benzoate (2.72 g, 2.5 ml, 20 mmol) and Et 2 AlCl 3 (1.0 M ... The organic layer was dried over MgSO 4 and concentrated ...