Kimia : Alkuna

Alkynes are unsaturated hydrocarbons that have a triple bond C = C. Spare the smallest alkane consists of two C atoms, ie ethyne. Alkyne name matches the name alkanes by replacing the suffix - ana be-una.
Name structure molecular formula
Ethene CH = CH C2H4
Propene CH = C-CH3 C3H4
Butene CH = C-CH2-CH3 C4H6
Pentena CH = C-CH2-CH2?-CH3 C5H8

From the table above the general molecular formula
can be formulated:

CnH2n-2

Alkene nomenclature

Alkyne nomenclature according to IUPAC nomenclature similar to alkenes, step-by-step to give the name of the alkyne is as follows:

1. Determine the parent chain, the longest carbon chain from one end to the other that passes through the double bond, name the corresponding alkyne C atom number in the parent chain.

2. Numbering. Numbering starts from the end of the parent chain closest to duplicate.

3. If there are branches with the branch name them according to the number of atoms C alkyl branch. If more than one branch, naming rule in accordance with the rules of the nomenclature alkanes.

4. Sequence naming: branch number branch-name-number dual-parent chain.

example:

36th

37th

Determination of the parent chain one Despite having the longest chain, but did not pass duplicate.

38th

alkyne isomers

Ethyne (C2H2), propene (C3H4) has no isomeri katena there is only one structure.