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(E)-Stilbene
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(''E'')-Stilbene, is a diarylethene, i.e., a hydrocarbon consisting of a trans ethene double bond substituted with a phenyl group on both carbon atoms of the double bond. The name stilbene is derived from the Greek word ''stilbos'', which means shining.
==Isomers==
Stilbene exists as two possible isomers. The first is ''trans''-1,2-diphenylethylene, called (''E'')-stilbene or ''trans''-stilbene. The second is cis-1,2-diphenylethylene, called (''Z'')-stilbene or ''cis''-stilbene, and is sterically hindered and less stable because the steric interactions force the aromatic rings out-of-plane and prevent conjugation. (''Z'')-Stilbene has a melting point of , while (''E'')-stilbene melts around , illustrating the two compounds are quite different in their physical properties.
Table 1. Vapor pressures
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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