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P. S. Rao and R. V. Venkataratnam, “Zinc Chloride as a New Catalyst for Knoevenagel Condensation,” Tetrahedron Letters, Vol. 32, No. 41, 1991, pp. 5821-5822.
http://dx.doi.org/10.1016/S0040-4039(00)93564-0

has been cited by the following article:

• TITLE: Solvent-Free Synthesis of 5-Alkenyl-2,2-butylidene-1, 3-dioxane-4,6-diones under Ultrasonic Irradiation with o-Phthalimide-N-Sulfonic Acid as Catalyst

  AUTHORS: Chunhua Lin, Zhaohui Xu, Weilin Liao

  KEYWORDS: o-Phthalimide-N-Sulfonicacid; 5-Alkenyl-2, 2-butylidene-1, 3-dioxane-4, 6-diones; Aromatic Aldehydes; Knoevenagel Condensation

  JOURNAL NAME: International Journal of Organic Chemistry, Vol.3 No.4, December 31, 2013

  ABSTRACT: 5-Alkenyl-2,2-butylidene-1,3-dioxane-4,6-diones were synthesized by the Knoevenagel condensation reaction of aromatic aldehydes with 2,2-butylidene-1,3-dioxane-4,6-dione using o-phthalimide-N-sulfonic acid as catalyst, without solvent under ultrasonic irradiation. The present method has some notable advantages such as mild reaction conditions, short reaction times, less catalyst dosage and high yields with the green aspects by avoiding toxic catalysts and solvents. Further, the catalyst can be reused for five times without any noticeable decrease in the catalytic activity.