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Bicyclobutane is noted for being one of the most strained compounds that is isolatable on a large scale — its strain energy is estimated at 63.9 kcal mol −1. It is a nonplanar molecule, with a dihedral angle between the two cyclopropane rings of 123°.
Many methods exist for the preparation of cyclobutanes. Alkenes dimerize upon irradiation with UV-light. 1,4-Dihalobutanes convert to cyclobutanes upon dehalogenation with reducing metals. Cyclobutane was first synthesized in 1907 by James Bruce and Richard Willstätter by hydrogenating cyclobutene in the presence of nickel. [8]
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Norbornane (also called bicyclo[2.2.1]heptane). Unsubstituted cycloalkanes that contain a single ring in their molecular structure are typically named by adding the prefix "cyclo" to the name of the corresponding linear alkane with the same number of carbon atoms in its chain as the cycloalkane has in its ring.
In alkanes, optimum overlap of atomic orbitals is achieved at 109.5°. The most common cyclic compounds have five or six carbons in their ring. [6] Adolf von Baeyer received a Nobel Prize in 1905 for the discovery of the Baeyer strain theory, which was an explanation of the relative stabilities of cyclic molecules in 1885.
The Stillman diet is a high-protein, low-carbohydrate diet devised in 1967 by physician Irwin Maxwell Stillman (1896–1975). [1] It focusses mostly on the complete avoidance of both fats and carbohydrates, and requires at least eight glasses of water to be consumed every day.
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