N-butyl lithium wsa a powerful base and aas well as nucleophile,measerment of the bases PKa valves,its PKa valve is nearly 40 at the same time two cH2 groups and three cH3 groups i.e both are electron donating groups nucleophilicity higher at the same time reactvity also high at narmal temp,but when temp was decreases reactivety also was decreases,other wise it attacks no. of regions of the molecule so result is no. of products are formed.