In organic chemistry, a vinyl halide is a compound with the formula CH 2 =CHX (X = halide). The term vinyl is often used to describe any alkenyl group. For this reason, alkenyl halides with the formula RCH=CHX are sometimes called vinyl halides.

2021年5月4日 · Whereas a compound is called a vinyl halide when it contains a halogen group directly attached to a doubly bonded carbon atom. For example, The double bonds in an aromatic system are not the same as the aliphatic double bonds.

2023年3月30日 · Vinylic halides are compounds with the formula CH 2 =CHX (X = halide), while aryl halides are a type of aromatic compound where a halide replaces one or more hydrogen atoms directly bonded to an aromatic ring.

Vinylic halides differ from alkyl halides in being essentially unreactive toward nucleophilic substitution. They do undergo elimination reactions similar to alkyl halides, although at slower rates, and they normally require very strong bases such as sodium amide (NaNH 2).

The functional group of alkyl halides is a carbon-halogen bond, the common halogens being fluorine, chlorine, bromine and iodine. With the exception of iodine, these halogens have electronegativities significantly greater than carbon.

A vinylic halide is an organic compound containing a carbon-carbon double bond (a vinyl group) directly bonded to a halogen atom, such as chlorine, bromine, or iodine. These compounds are important intermediates in the preparation of alkynes through elimination reactions of dihalides, as described in the topic 9.2 Preparation of Alkynes.

Simple aryl halides like chlorobenzene are very resistant to nucleophilic substitution. It is possible to replace the chlorine by -OH, but only under very severe industrial conditions - for example at 200°C and 200 atmospheres. In the lab, these reactions do not happen.