title: Reaction of 1-tert-butyl-3,4-diphenyl-1,2,4-triazol-5-ylidenes with a malonic ester.
abstract: Four stable carbenes, 1-tert-butyl-3,4-diaryl-1,2,4-triazol-5-ylidenes 1a-d, including new fluorine-containing compounds 1c,d, react with a malonic ester to afford heterocyclic zwitterionic compounds 5a-d. The reactions with more acidic compounds (ethyl acetoacetate, malononitrile and 1,3-dimethylbarbituric acid) proceed with substrate deprotonation to form the respective azolium salts 6a-c. The X-ray crystal structure of 5a was also determined.
authors: The L. M. Litvinenko Institute of Physical Organic and Coal Chemistry, Ukrainian Academy of Sciences, 70 R. Luxemburg, Donetsk 83114, Ukraine. nkorotkikh@ua.fm
authors: Nikolai I
authors: NI
authors: Korotkikh
authors: Alan H
authors: AH
authors: Cowley
authors: Jennifer A
authors: JA
authors: Moore
authors: Nataliya V
authors: NV
authors: Glinyanaya
authors: Ilia S
authors: IS
authors: Panov
authors: Gennady F
authors: GF
authors: Rayenko
authors: Tatyana M
authors: TM
authors: Pekhtereva
authors: Oles P
authors: OP
authors: Shvaika