acetic acid in tetrahydrofuran Ambient temperature; Yield given;

1: With n-butyllithium T=-78°C; 2: With pyridinium p-toluenesulfonate in ethanol T=50°C; Further stages.;

9-borabicyclo[3.3.1]nonane dimer; (+)-(R)-α-pinene; acetaldehyde in tetrahydrofuran 2.5 h reflux then room temperature; Yields of byproduct given. Title compound not separated from byproducts;