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The same operation as in the preparation of the compound 1a except that phenylacetylene (0.20 g, 2.0 mmol) was used instead of 0.55 g and 2.2 mmol of dimethyl[2-(2-tetrahydro-2H-pyranoxymethyl)phenylsilane (R2 and R3 in (5): methyl group) and 1-octyne, thereby obtaining (E)-(2-(hydroxymethyl)phenyl) dimethyl(2-phenylethenyl)silane (0.45 g, yield of 84%) as a colorless oil, Rf: 0.20 (hexane-ethyl acetate=10:1). 1H NMR (400 MHz, CDCl3) δ 7.62 (dd, J=7.4, 1.3 Hz, 1H), 7.51-7.41 (m, 4H), 7.37-7.27 (m, 4H), 6.97 (d, J=19.2 Hz, 1H), 6.67 (d, J=19.2 Hz, 1H), 4.79 (s, 2H), 0.52 (s, 6H); 13C NMR (101 MHz, CDCl3) δ 146.5, 145.2, 138.0, 136.4, 135.3, 130.0, 128.6, 128.3, 127.9, 127.8, 127.1, 126.5, 65.4, −1.2; Anal. Calcd for C17H20Osi; C, 76.07; H, 7.51. Found: C, 75.73; H, 7.55.