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4921017 
Journal Article 
Facile Aldolization Catalyzed by Ionic Liquid [4-Sulfbmpyrazine][BF4] 
Zou, J; Yi, F; Zhang, L; Wang, Z 
2013 
Yes 
Asian Journal of Chemistry
ISSN: 0970-7077
EISSN: 0975-427X 
25 
12 
6643-6646 
English 
WOS:000325088800035 
The acidic functionalized ionic liquid 1-(4-sulfonic group) butyl-3-methylpyrazine tetrafluoroborate (abbreviated as [4-sulfbmpyrazine][BF4]) was employed as the catalyst of the condensation of aromatic aldehyde and diols. The optimized condition was as follows: aromatic aldehyde (0.20 mol), diols (0.30 mol) and [4-sulfbmpyrazine][BF4] (0.60 g) were refluxed in cyclohexane (10.00 mL) for 1 h. A series of aromatic aldehydes were studied and afforded the corresponding acetals products with good yields which were from 70.3 to 96.9 %. The ionic liquid catalyst could be recycled for four times without significant loss of catalyst reactivity. 
Aldolization; Ionic liquid; Aromatic aldehyde; Acetals