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The concepts of syn and anti addition are used to characterize the different reactions of organic chemistry by reflecting the stereochemistry of the products in a reaction. The type of addition that occurs depends on multiple different factors of a reaction, and is defined by the final orientation of the substituents on the parent molecule .
Anti-periplanar geometry will put a bonding orbital and an anti-bonding orbital approximately parallel to each other, or syn-periplanar. Figure 6 is another representation of 2-chloro-2,3-dimethylbutane (Figure 5), showing the C–H bonding orbital, σ C–H, and the C–Cl anti-bonding orbital, σ* C–Cl, syn-periplanar.
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2006-11-30T05:51:12Z E kwan 1295x258 (9602 Bytes) syn vs anti convention; Uploaded with derivativeFX. ... Date/Time Thumbnail Dimensions User Comment; current: 14:27 ...
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For example, butane has three conformers relating to its two methyl (CH 3) groups: two gauche conformers, which have the methyls ±60° apart and are enantiomeric, and an anti conformer, where the four carbon centres are coplanar and the substituents are 180° apart (refer to free energy diagram of butane).
Syn-anti-Notation; Usage on es.wikipedia.org Adición sin y anti; Usage on et.wikipedia.org Liitumisreaktsioon; Usage on fa.wikipedia.org افزایش سین و آنتی; Usage on fr.wikipedia.org Addition syn et anti; Usage on id.wikipedia.org Adisi sin dan anti; Usage on pt.wikipedia.org Adição sin e anti; Usage on uk.wikipedia.org