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C. Djerassi and M. Gorman, “Studies in Organic Sulfur Compounds. Cyclic Ethylene and Trimethylene Hemi- thioketals,” Journal of the American Chemical of Society, Vol. 75, No. 13, 1953, pp. 3704-3708. doi:10.1021/ja01111a029

has been cited by the following article:

• TITLE: I2/Nanostructured Pyrophosphate : A Mild and Efficient Catalyst for the Selective Protection of Carbonyl Compounds

  AUTHORS: Asmae Lemaanni, Asmae Snik, Karima Abdelouahdi, Abderrahim Solhy, Mohamed Zahouily

  KEYWORDS: Catalyst; Free Solvent; Nanostructured Pyrophosphate; Protection of Carbonyl Compounds; Iodine

  JOURNAL NAME: Modern Research in Catalysis, Vol.1 No.2, July 24, 2012

  ABSTRACT: A new solvent free method for protection of carbonyl compounds as their thioacetals has been accomplished through the use of iodine supported on nanostructured pyrophosphate. Advantages of the methodology include very short reaction time, the requirement for minimum amounts of catalyst, the remarkably simple experimental procedure, and no necessity for solvents or inert atmospheres, excellent yields and recyclability of the catalyst used. An efficient method for the chemoselective thioacetalization of ketones in the presence of aldehydes using I2/nanostructured pyrophosphate is also reported in this article. The nanostructured pyrophosphate was characterized by scanning electron microscopy, X-ray diffraction, infrared spectroscopy, Transmission electron microscopy and thermal gravimetric analysis, respectively.