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2005
C-C bond formation
O 0282
Imidazolium Salts as Phase-Transfer Catalysts for the Dialkylation and Cycloof Active Methylene Compounds. — The dialkylation/cycloalkylation of
20- 045 alkylation
active methylene compounds (I) is efficiently promoted by catalytic amounts of imidazolium-type ionic liquids as phase transfer catalyst. Reaction with 1,3-dibromopropane
gives the mono-alkylated bromides (XI) instead of the expected cyclobutanes. With an
excess of active methylene compounds, the bis-alkylated products (XII) are obtained.
— (MUTHUSAMY*, S.; GNANAPRAKASAM, B.; Tetrahedron Lett. 46 (2005) 4,
635-638; Cent. Salt Mar. Chem. Res. Inst., Bhavnagar 364 002, India; Eng.) — Mais
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