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Fluorocarbons, organic molecules with carbon skeletons and fluorine "skins", differ fundamentally from their hydrocarbon counterparts in interesting and useful ways. A selection of the myriad applications fluorocarbons and their derivatives have found in modern life is described and related to molecular properties. Salient aspects of the nature and reactivity of fluorocarbon compounds are highlighted by comparison with their more familiar hydrocarbon analogues.

The first tetraaminoethylene was prepared by Pruett in 1950, 1 but the systematic study of molecules of this type began a decade later when Wanzlick reported the synthesis of 1 (R ) Ph). 2,3

Azulene is a simple, beautiful, and theoretically interesting compound with many unusual properties. For all of these reasons one might expect it to enjoy a place in the undergraduate laboratory curriculum, but it is a rare undergradu-

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