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Structures of the significant conformations are shown: chair 1, half-chair 2, twist-boat 3 and boat 4. When ring flip happens completely from chair to chair, hydrogens that were previously axial ( blue H in upper-left structure) turn equatorial and equatorial ones ( red H in upper-left structure) turn axial. [ 3 ]
2-Hexyne can be semihydrogenated to yield 2-hexene or fully hydrogenated to hexane. [3] With appropriate noble metal catalysts it can selectively form cis-2-hexene. [4] 2-Hexyne can act as a ligand on gold atoms. [5] With strong sulfuric acid, the ketone 2-hexanone is produced. However this reaction also causes polymerization and charring. [6]
Cis and trans descriptors are not used for cases of conformational isomerism where the two geometric forms easily interconvert, such as most open-chain single-bonded structures; instead, the terms "syn" and "anti" are used. According to IUPAC, "geometric isomerism" is an obsolete synonym of "cis–trans isomerism". [2]
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In smaller cycloalkenes, it is expected for the bonds to be greater in length uniformly to account for increased strain, but for example, trans-cycloheptane has varying bond lengths. Also, the vinylic carbons on trans cyclohexanes exhibit longer bond lengths than their respective cis isomer for trans-cycloheptane through trans-cyclononene (7 ...
SEOUL (Reuters) -Samsung Electronics' preliminary fourth-quarter operating profit missed estimates by a large margin, with the South Korean tech giant hit hard by extra costs as it works towards ...
Therefore, when free rotation is impossible, the hydroxy and acetoxymercuri groups will always be trans to each other. Shown below is an example of regioselectivity and stereospecificity of the oxymercuration reaction with substituted cyclohexenes. A bulky group like t-butyl locks the ring in a chair conformation and prevents ring flips.
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