potassium acetate; copper(l) chloride in N,N-dimethyl-formamide T=20°C; 16 h;

1: 4,8-dimethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,6,2-dioxazaborocane With copper(l) chloride in dichloromethane 0.166667 h; Inert atmosphere; 2: methyl vinyl ketone in methanol; dichloromethane T=0 - 20°C; 48 h; Inert atmosphere;

potassium acetate; copper(l) chloride in N,N-dimethyl-formamide (N2); stirring a mixt. of ketone with boron compd. in DMF in the presence of CuCl and CH3COOK at room temp. for 16 h, addn. of water;

1: Pt[bis(phenylimino)acenaphthene](dimethylfumarate) / benzene-d6 / 0.25 h / 20 °C 2: H2O View Scheme

n-butyllithium; diisopropylamine in tetrahydrofuran to a soln. of amine added a soln. of BuLi at 0° C, stirred for 20 min, hydrazone added dropwise, stirred (20 min, 0°C), B comp. added (-78°C), warmed to room temp. for 10 min, qunched at 0°C (sat. aq. NH4Cl) after 4 h; extd. (ethylacetate), dried (MgSO4), solvent removed (vac.), distilled (75°C, 0.5 mm Hg);

1.1: LDA / tetrahydrofuran; hexane / 0.33 h / 0 °C 1.2: tetrahydrofuran; hexane / 4 h / -78 - 20 °C 2.1: 0.44 g / aq. NH4Cl / tetrahydrofuran; hexane View Scheme