Nitroselenation of carbon‐carbon triple bond by PhSeSePh and NO /O 2 or NO 2

When alkynes were treated with diphenyl diselenide under an atmosphere of nitric oxide and oxygen, nitroselenation of the carbon‐carbon triple bond proceeded with a high regioselectivity to give the corresponding 1‐nitro‐2‐phenylseleno alkenes. Similarly, the nitroselenation of alkynes proceeded by the reaction of the alkynes with nitrogen dioxide. The stirring of the 1,2‐bis(phenylseleno) alkenes under an atmosphere of nitric oxide and oxygen also gave the corresponding 1‐nitro‐2‐phenylseleno alkenes.