Alkenes IUPAC nomenclature

IUPAC nomenclature names ethers as alkoxy alkanes, alkoxy alkenes, or alkoxy alkynes. The group in the chain that has the greatest number of carbon atoms is designated the parent compound. In the case of aromatic ethers, the benzene ring is the parent compound. 

IUPAC Names The IUPAC nomenclature for alkynes is similar to that for alkenes. We... 

The term enamine is used mainly for classifications of the functional group as an ensemble, but individual compounds are termed with respect to the parent compound usually as amino substituted olefins, i.e. tertiary enamines as (N,iV-dialkylamino)alkenes. The correct IUPAC nomenclature for tertiary enamines is dialkylalkenylamines, i.e. the basic compound in this case is the amine not the alkene. The difference may be demonstrated for two examples 73 is in the first notation l-iV-methylanilino-2-methyl-propene and, in IUPAC notation, iV-methyl-jV-(2-methyl-l-propenyl)aniline. Correspondingly 74 is usually called 2-methyl- 1-pyrrolidinopropene but in IUPAC notation it is jV-(2-methyl-l-propenyl)pyrrolidine. 

In naming alkynes the usual IUPAC rules for hydrocarbons are followed, and the suffix -ane is replaced by -yne. Both acetylene and ethyne are acceptable IUPAC names for HC=CH. The position of the triple bond along the chain is specified by number in a manner analogous to alkene nomenclature. 

Organic Nomenclature IUPAC Rules 285 Cycloalkanes 286 Saturated Compounds 287 Alkenes 287... 

Heterocycle (85) may be systematically described as 3-substituted anhydro-5-hydroxy-1,2,3,4-oxatriazolium hydroxide. However, this nomenclature is somewhat cumbersome and the terminology mesoionic has been used throughout this review. Thus compounds (85)-(87) and (91) are named mesoionic l,2,3,4-oxatriazol-5-ones (85), -5-thiones (86), -5-imines (87) and mesoionic l,2,3,4-thiatriazole-5-alkenes (91), respectively. Using IUPAC Rule. C-87 (85) is named 3-substituted l,2,3,4-oxatriazol-5-ylio oxide or 3-substituted l,2,3,4-oxathiazolylium-5-olate and (87 R = R1 = Ph) is named iV-[3-phenyl-5-(l,2,3,4-oxatriazolio)]anilide. 

The common names of glycols can be awkward and confusing because the -ene portion of the name implies the presence of an alkene double bond, but the glycol does not contain a double bond. We will generally use the IUPAC dk>l nomenclature for diols, but be aware that the names ethylene glycol (automotive antifreeze) and propylene glycol (used in medicines and foods) are universally accepted for these common diols. 

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