Difluorovinylidene, F2CC: (pages 1983–1985)
Dr. Jürgen Breidung, Prof. Dr. Hans Bürger, Dipl.-Chem. Carsten Kötting, Dr. Rodion Kopitzky, Prof. Dr. Wolfram Sander, Dipl.-Chem. Michael Senzlober, Prof. Dr. Walter Thiel and Prof. Dr. Helge Willner
Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.199719831
An alkyne–vinylidene isomerization is also possible with the difluoro compounds 1 and 2! Irradiation of 2 (λ = 193 nm) in an Ar matrix yields 1 exclusively. The IR spectrum agrees with results of novel abinitio calculations, which also suggest that 1—in sharp contrast to the vinylidenes RHCC—is protected against isomerization into 2 by a kinetic barrier. Irradiation with light with λ > 230nm converts 1 back into 2. Already at 35–42 K 1 adds CO and N2 to yields F2CCCO and F2CCNN, respectively.