Bis[phenyl[(perfluoroalkanesulfonyl)oxy]iodo]acetylene, PhI+C≡CI+Ph·2RFSO3 -, and 1,4-bis[phenyl[(perfluoroalkanesulfonyl)oxy]iodo]-1,3-butadiyne, PhI+C≡C - C≡CI+Ph·2RFSO3 -