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2004
Halogen compounds
Q 0090
Reaction of CBrF2—CBrF2 with Hydrazones of Aromatic Aldehydes Novel EffiSynthesis of Fluorocontaining Alkanes, Alkenes and Alkynes. — In situ pre52- 062 cient
pared hydrazones of aryl aldehydes (I) react with CBrF2—CBrF2 (II) in the presence of
CuCl to fluoro alkanes (III). In some cases symmetric azines such as (IV) are also isolated from the reaction mixture. Subsequent elimination of HF from (III) by NaOH
results in stereospecific formation of fluorocontaining olefins (V). Treatment of (III)
with tBuOK, however, affords the corresponding alkynes (VI) after elimination of two
molecules HF. — (NENAJDENKO*, V. G.; VARSEEV, G. N.; KOROTCHENKO, V.
N.; SHASTIN, A. V.; BALENKOVA, E. S.; J. Fluorine Chem. 125 (2004) 9,
1339-1345; Dep. Chem., Moscow State Univ., Moscow 119889, Russia; Eng.) —
M. Paetzel
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