Unsatured acyclic hydrocarbons

Selection of the principal chain in unsaturated branched acyclic hydrocarbons. A principal chain must be chosen upon which to base the name of branched unsaturated acyclic hydrocarbons. The general criteria listed in Table 4.10 are applied. Those that are specifically relevant to polyenes and polyynes are criterion (b), which is the maximum number of double and triple bonds considered together criterion (c), which is the maximum length criteria (d), (f) and (g) criterion (h), which is the maximum number of substituents cited as prefixes and criteria (i) and (j). 

Saturated and Unsaturated Acyclic Hydrocarbons 6 Allenes and Cumulenes... 

The chemical shifts of the carbons of C=C double bonds typically range from ca. 80-160 ppm a wider range of 40-210 ppm is observed with O- and N-substituents. In unsaturated acyclic hydrocarbons, they can be predicted with high accuracy (see below). To estimate the chemical shifts in all other substituted alkenes, one can use the substituent effects listed for chemical shifts in vinyl groups. However, since no configuration-dependent parameters are available, the values thus estimated are less accurate than those for unsaturated acyclic hydrocarbons. 

Estimation of the Chemical Shifts of -Hybridized Atoms in Unsaturated Acyclic Hydrocarbons... 

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