Asked by: Danya Honov
asked in category: General Last Updated: 31st January, 2020

What does syn mean in chemistry?

Syn addition is the addition of two substituents to the same side (or face) of a double bond or triple bond, resulting in a decrease in bond order but an increase in number of substituents. Generally the substrate will be an alkene or alkyne.

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Beside this, what is anti and syn?

When the two atoms are added to the same side, this is called a syn relationship, while the two atoms added to opposite sides is called an anti relationship.

Secondly, what is a syn addition reaction? Illustrated Glossary of Organic Chemistry - Syn addition. Syn addition: An addition reaction in which all new bonds are formed on the same face of the reactant molecule. Addition of Br2 to an alkene is an anti addition because the two new carbon-bromine bonds are formed on opposite faces of the alkene.

Also know, is SYN the same as CIS?

The difference is subtle: “cis” and “trans” implies that the orientation of the two groups is locked; you can't convert cis to trans through rotation. The terms “syn” and “anti” imply similar relationships to “cis” and “trans”, but can also be applied to systems which are not locked.

How do you know if it's syn or anti addition?

When both atoms/groups add to the same face it's considered syn addition. When they add to opposite faces it's considered anti addition. The difference between the two is determined by which atom the group added to (Mark vs Anti-Mark) or to which SIDE it adds (syn vs anti).

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