1: tBuCH2CH2B(H)NiPr2; 1,2-dichloro-4-diazoniumbenzene tetrafluoroborate With bis(cyclopentadienyl)titanium dichloride in acetonitrile T=20°C; 2.5 h; 2: With methanol in acetonitrile T=0 - 20°C; 1 h; 3: 2,3-dimethylbutane-2,3-diol in diethyl ether; acetonitrile T=20°C; 4 h; Reagent/catalyst;

palladium diacetate in methanol Heck-Matsuda reaction;

potassium acetate; 18-crown-6 ether 1.5 h; Ambient temperature;

sodium hydroxide in water; acetonitrile T=70 - 75°C;

1: sodium hydroxide / water; acetonitrile / 70 - 75 °C 2: triethylamine / tetrahydrofuran / 16 h / 60 °C View Scheme

With  tetrafluoroboric acid T=0°C;  diazotization;