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|Section2= |Section3= }} Dewar benzene or bicyclo()hexa-2,5-diene is a bicyclic isomer of benzene with the molecular formula C6H6. The compound is named after James Dewar who included this structure in a list of possible C6H6 structures in 1867.〔 〕 However, he did not propose it as the structure of benzene, and in fact he supported the correct structure previously proposed by August Kekulé in 1865.〔 ==Synthesis and properties of bicyclo()hexa-2,5-diene== The compound itself was first synthesized in 1962 as a ''tert''-butyl derivative〔 〕 and then as the unsubstituted compound by E.E. van Tamelen in 1963 by photolysis of ''cis''-1,2-dihydro derivative of phthalic anhydride followed by oxidation with lead tetraacetate.〔 〕 : Unlike benzene, Dewar benzene is not flat; the two cyclobutene rings make an angle. The compound has nevertheless considerable strain energy and reverts to benzene with a chemical half-life of two days. This thermal conversion is relatively slow because it is symmetry forbidden based on orbital symmetry arguments. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Dewar benzene」の詳細全文を読む スポンサード リンク
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