1: CH2-indene With n-butyllithium in tetrahydrofuran; hexane T=-78°C; Metallation; 2 h; 2: dimethylmono-chlorosilane in tetrahydrofuran; hexane T=20°C; silylation; 12 h; Further stages. Title compound not separated from byproducts.;

1: CH2-indene With n-butyllithium 2: dimethylmono-chlorosilane Further stages.;