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Subject - Organic Chemistry

In organic chemistry, addition is an important reaction type in which a molecular fragment is added to an unsaturated compound resulting in a lower degree of unsaturation in the product. For example, addition of a hydrogen halide to the C=C double bond of an unsaturated hydrocarbon yields a saturated single-substituted hydrocarbon halide.

Besides alkenes and alkynes, substrates with carbon-heteroatom double and triple bonds are part of the group of unsaturated compounds and behave similarly. Addition reactions can proceed regioselectively or regiospecifically as well as stereoselectively or stereospecifically. Addition to the double bond from the same side of the substrate is called syn-addition while addition from the opposite side is called anti-addition.

See also: hydration

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