Cl[CH2:2][Si:3]([CH3:6])([CH3:5])[CH3:4].[OH:7][C:8]1[CH:15]=[CH:14][C:11]([CH:12]=[O:13])=[CH:10][CH:9]=1.C(=O)([O-])[O-].[K+].[K+]>CN(C=O)C>[CH3:4][Si:3]([CH2:2][O:7][C:8]1[CH:15]=[CH:14][C:11]([CH:12]=[O:13])=[CH:10][CH:9]=1)([CH3:6])[CH3:5]Chloromethyltrimethylsilane (110.5 g, 0.9 mol) is added dropwise over 30 minutes to a mixture of para-hydroxybenzaldehyde (110 g, 0.82 mol) and potassium carbonate (124.5 g, 0.9 mol) in 1 L of dry DMF maintained at 80° C., and while sparging with nitrogen. The mixture is left at 90° C. for 4 hours. The reaction mixture is filtered and the solvent is removed from the filtrate by distillation under vacuum. The final traces of DMF are removed via a stage at 60° C. under a vacuum of 2 mmHg. 142.4 g (yield: 84%) of 4-trimethylsilanylmethoxybenzaldehyde are obtained in the form of an orange-yellow oil, which is used without further purification in the next step.
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