Longest chain IUPAC rule

I wonder, what are the exact IUPAC organic chemistry nomenclature rules that give the preference to the chain length over number of unsaturated bonds, i.e. that justify, or prefer following names:


[![structure 1](https://i.stack.imgur.com/RLug9.png)](https://i.stack.imgur.com/RLug9.png)


4-ethenyl-4-ethynylheptane *over*  

3,3-dipropylpent-1-en-4-yne


[![structure 2](https://i.stack.imgur.com/0hvo3.png)](https://i.stack.imgur.com/0hvo3.png)


3,5-dimethylideneheptane *over*  

2,4-diethylpenta-1,4-diene


?




In Chapter P-4 "Rules for Name Construction", section P-44 "Seniority Order for Parent Structures", of *Nomenclature of Organic Chemistry: IUPAC Recommendations and Preferred Names 2013*, it is stated that (p 490):



> 
> **P-44.3.2** The principal chain has the greater number of skeletal atoms [criterion (b) in P-44.3].
> 
> 
> 


The Blue Book lists several helpful examples, one of which is that the principal chain "octane" is senior to "hept-1-ene". Therefore, the following compound


[![Compound to be named](https://i.stack.imgur.com/ka5Jq.png)](https://i.stack.imgur.com/ka5Jq.png)


is named 3-methylideneoctane instead of 2-ethylhept-1-ene.


The authors mention that this preference is in contrast to previous recommendations (e.g. [1979](http://www.acdlabs.com/iupac/nomenclature/79/r79_933.htm)):



> 
> In acyclic parent structures the order of seniority between unsaturation and length of chain given in earlier recommendations is reversed. Thus, the first criterion to be considered in choosing a preferred parent acyclic chain is the length of the chain; unsaturation is now the second.
> 
> 
> 


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