Decaborane in methanol T=20°C; 0.333333 h;

1: (trimethyl)silylmethyllithium With copper(l) iodide; tributylphosphine in diethyl ether; pentane T=-78°C; Metallation; 0.333333 h; 2: 4-(p-Methoxyphenyl)-2-butanone dimethyl acetal With boron trifluoride diethyl etherate in diethyl ether; pentane T=-78 - -20°C; Peterson-type olefination; 1 h;