1: 1.) dibutyltin oxide / 1.) benzene, reflux, 1 h, 2.) toluene, room temperature, 1 h 2: 1.) dibutyltin oxide / 1.) toluene, reflux, 1 h, 2.) toluene, 0 deg C, 20 min ---> room temperature View Scheme

di(n-butyl)tin oxide 1.) toluene, reflux, 1 h, 2.) toluene, 0 deg C, 20 min ---> room temperature; Yield given. Multistep reaction;

di(n-butyl)tin oxide 1.) benzene, reflux, 1 h, 2.) toluene, 0 deg C, 20 min ---> room temperature; Yield given. Multistep reaction;

(i) Na, Et2O, (ii) /BRN= 605287/; Multistep reaction;