[NH2:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[C:8](=[O:15])[CH2:9][CH2:10][Si:11]([CH3:14])([CH3:13])[CH3:12].[ClH:16].C(OCC)C>C(OCC)C>[ClH:16].[NH2:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[C:8](=[O:15])[CH2:9][CH2:10][Si:11]([CH3:14])([CH3:13])[CH3:12]To the solution of crude (3) (220 gram, 92.2% HPLC purity) in ethyl ether (450 milliliter), was added saturated hydrochloric acid/ethyl ether solution dropwise at room temperature over 30 minutes. The precipitated solid was filtered, the filter cake was washed with mixed solvent (ethyl ether: n-hexane 1:1 v/v; 400 mL), and dried under high vacuum for 2 hours at room temperature to give the desired product (14) (160 g; yield: 62.4%) as a light tan solid. HPLC purity: 98%; LC-MS: m/z 222 (MH+);
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