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Reagents and conditions: (a) i: triphenylmethylponium bromide (35 mmol), n-butyl lithium (32 mmol) in THF at 0° C under N2 atoms. ii: 0.01M HCl and ether extraction. (b) mepba (32 mmol) in CH2Cl2 at 250 C. (c) non-aqueous HCl (2 M in chloroform) at 0 °C for 1 hr.
