1: With azobisisobutyronitrile; tri-n-butyl-tin hydride in benzene Rearrangement; 7.5 h; 2: With methyllithium in benzene T=20°C; desilylation; 12 h; Further stages.;

1: With azobisisobutyronitrile; tri-n-butyl-tin hydride in benzene Rearrangement; 7.5 h; 2: With methyllithium in benzene T=20°C; desilylation; 12 h; Further stages.;