The homologous hydrocarbon series R <sub> 4 </sub> C is known for R=Me as neopentane and for R=Et as 3,3-diethylpentane. The next homologue, R= <em> <sup> i </sup> </em> Pr bis(3,3-isopropyl)-2,4-dimethylpentane is also a known molecule[1] for which a crystal structure has been reported (DOI: https://doi.org/10.5517/cc4wvnh). The final member of the series, R= <sup> t </sup> butyl is unknown.