Alkyne compound

alkyne compounds are hydrocarbons possèdant a non-saturation characterized by the presence of triple bond between two atoms of . The alkyne compounds thus have the following sequence:

It is said that one deals with alkyne compound truth if R or R' is a hydrogen.

Alkyne compounds, or acetylenic hydrocarbons, have as a general formula: CnH2n-2

And are characterized by the presence in their molecule of triple connection:

Nomenclature The olefinic hydrocarbons are named like corresponding alkyne compounds, by replacing the termination "-ene" by the termination "- yne"; however the first term, C2H2, made exception and are called acetylene.

Physical properties Acetylene, propyne and the butyne-1 are the gas ones at the ordinary temperature; the other terms are liquid then solid, as their molecular weight increases. Acetylene is not very water soluble, but much more in acétone(CH3-CO-CH3). Its formation starting from its elements is endothermic, it absorbs 55 Kcal/mole

Acetylene is unstable, for this reason, and tends to break up in a sometimes violent way, especially if it is compressed or liquified. This characteristic a long time obstructed the use of acetylene in various applications that it to receive little. One little however to transport it without danger in the form of solution in acetone, and to use it under a light pressure in the industrial syntheses with the proviso of diluting it with an inert gas (nitrogenizes) and of displacing air of the installations completely.

Chemical properties It is advisable to distinguish from triple connection, which is common to all alkyne compounds, and the properties from the contiguous hydrogen to triple connection, which are particular with "true" alkyne compounds. Triple connection presents the same type of reactivity as the double connection, but with a sometimes different intensity. Like it, it prète with reaction of addition and it constitutes a point of less resistance of the chain.

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