4-Nitrophenylacetylene, on the other hand, could not be reduced selectively under any conditions and only 4-aminobenzyl could be found as a product. With an excess of reducing agent this product could be obtained in 71 70 yield. l-Phenyll-3-methylbut-3-en-l-yne apparently was reduced to the cis diene, but the diene underwent partial isomerization to the trans isomer under all conditions we tried. Catalytic reduction of this compound with ...