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D. Armetso, W. M. Horspool, N. Martin, A. Ramos and C. Seaone, “Synthesis of Cyclobutenes by the Novel Photochemical Ring Contraction of 4-Substituted-2-amino-3,5- dicyano-6-phenyl-4H-pyrans,” The Journal of Organic Chemistry, Vol. 54, No. 11, 1989, pp. 3069-3072.

has been cited by the following article:

• TITLE: Palladium (0) Nanoparticles: A Novel and Reusable Catalyst for the Synthesis of Various Pyran Derivatives

  AUTHORS: Mithu Saha, Amarta Kumar Pal

  KEYWORDS: Palladium Nanoparticles; Multi-Component Reaction; Pyran Derivatives; Dimedone; 4-Hydroxy Coumarin; Pyranazolone

  JOURNAL NAME: Advances in Nanoparticles, Vol.1 No.3, November 30, 2012

  ABSTRACT: A ligand free, Palladium nanoparticles catalyzed synthesis of pyran derivatives using C-H activated compound, malononitrile and aryl aldehyde via Knoevenagel condensation followed by Michael addition reaction using Palladium nanoparticles as catalyst in one-pot is described herein. The advantages of this method lie in its simplicity, low catalyst loading, cost effectiveness and easy to handle. The Palladium Nanoparticles can be reused without loss of activity even after recycling four times. The palladium nanoparticles were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM). The present method also allows us to synthesize highly functionalized title compounds from simple and readily available inputs.