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Difluorovinylidene, F 2 CC:

1997; Wiley; Volume: 36; Issue: 18 Linguagem: Inglês

10.1002/anie.199719831

1521-3773

Jürgen Breidung, H. Bürger, Carsten Kötting, Rodion Kopitzky, Wolfram Sander, Michael Senzlober, Walter Thiel, Helge Willner,

Fluorine in Organic Chemistry

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 RHCC—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 N 2 to yields F 2 CCCO and F 2 CCNN, respectively. equation image