Enes with Ynes chain numbered from end closest toπ-bond tie goes to the alkene 7,8-dime thyl-5(E),7(2-de cadie n-1-yne Enes with Ynes chain numbered from end closest to p-bond 1 5 7 7,8-dimethyl-5(E),7(Z)-decadien-1-yne tie goes to the alkene