1: With (S)-Me2Si(η5-OHF)(η5-C5H3(-)-menthyl)Smn(TMS)2 in benzene-d6 T=25°C; 168 h; 2: With sodium hydroxide; benzyl chloroformate in diethyl ether; benzene-d6 3: With hydrogen; palladium on activated charcoal in ethanol T=20°C; 1 h; Title compound not separated from byproducts;