136000-99-2Relevant academic research and scientific papers
STUDIES ON PHOSPHONIUM YLIDES-XIII. THE REACTIVITY OF N,N'-2,5-CYCLOHEXADIENES-1,4-DIYLIDENEBIS TOWARDS WITTIG REAGENTS
Boulos, L. S.,Hanna, Atef G.,Hennawy, I. T.,Arsanious, M. H. N.
, p. 181 - 187 (2007/10/02)
Cyanomethylenetriphenylphosphorane (IIa) reacts with N,N'-2,5-cyclohexadiene-1,4-diylidenebis (Ia) affording the new azacyclopropane adduct IIIa.On the other hand, methylenetriphenylphosphoranes (IIb-d) react with quinoneimine (Ia) and its 2-chloro-derivative (Ib) yielding the corresponding ylid-phosphorane adducts IIIb-g.Structural reasoning for compounds III was based on compatible analytical and spectral data (IR, 1H, 31P, 13C, NMR and MS).A mechanism is proposed to explain the formation of compounds III. Key words: N,N'-2,5-Cyclohexadiene-1,4-diylidenebis> (Ia,b); Wittig reagents (II); azacyclopropane adduct (IIIa); alkyl-1--4,2,5-cyclohexadiene-1-acetate (IIIb,c); N-4-(benzenesulfonyl)amino>-4-benzenesulfonamide (IIId).
