[CH3:1][O:2][C:3]([O:7][Si](C)(C)C)=[C:4]([CH3:6])[CH3:5].F[B-](F)(F)F.[C:17]1([N+:23]#[N:24])[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1>N1C=CC=CC=1.C(OCC)C>[CH3:5][C:4]([N:24]=[N:23][C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1)([CH3:6])[C:3]([O:2][CH3:1])=[O:7]1.0 mmol of (1-methoxy-2,2- dimethylethenyl)-oxytrimethylsilane was placed in a 20-ml flask, followed by the addition of 3 ml of pyridine as a solvent. 1.3 mmol of benzenediazonium tetrafluoroborate was added to the flask. The obtained mixture was stirred at 0° C. in a nitrogen atmosphere for 2 hours. The reaction mixture was diluted with diethyl ether and washed with 1.5 N hydrochloric acid, water and a saturated aqueous solution of common salt successively. The obtained organic phase was dried over magnesium sulfate and distilled under a reduced pressure to remove the solvent. The obtained oily mixture was subjected to silica gel thin-layer chromatography to obtain 0.90 mmol of methyl 2-methyl-2-phenylazopropionate.
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