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what is syn addition and syn-stereoselectivity? pls tell difference if any or are they same

what is syn addition and syn-stereoselectivity? pls tell difference if any or are they same
 

Grade:11

1 Answers

Suraj Prasad IIT Patna
askIITians Faculty 286 Points
6 years ago
When an alkene undergoes addition, two new s bonds are formed. If we think of an alkene as having two faces, then the two new s bonds can either both form on the same face, which we call syn addition, or they can be formed on different faces which we call anti addition. Remember that an alkene unit is planar. The alkene has been drawn in a wedge hash type style which means that the substituents on the C=C are into and out of the page. This means that the two faces of the alkene are above and below the where the alkene makes the horizontal plane. Syn addition results when the two new bonds are both formed to the same face of the alkene, in this case they are shown to have formed on the top face. Anti addition results when the two new bonds have formed to opposite faces.

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