What is the IUPAC nomenclature for alkanes with large numbers of C atoms (more than 200)? For example, what is the IUPAC accepted name for CX205HX412?
Answer
The definitive answer is, of course, in the rules established by the IUPAC’s “Commission on nomenclature in organic chemistry”. The reference you are looking for is:
“Extension of Rules A-1.1 and A-2.5 Concerning Numerical Terms Used in Organic Chemical Nomenclature”, Pure Appl. Chem., 1986, 58, 1693-1696
which can be found here as a PDF and here as an HTML version. In particular:
NT-1.1 - The fundamental numerical terms for use in hydrocarbon names or as multiplying prefixes for simple features are given in the following list:
1mono- or hen-10deca-100hecta-1000kilia-2di- or do-20icosa-200dicta-2000dilia-3tri-30triaconta-300tricta-3000trilia-4tetra-40tetraconta-400tetracta-4000tetralia-5penta-50pentaconta-500pentacta-5000pentalia-6hexa-60hexaconta-600hexacta-6000hexalia-7hepta-70heptaconta-700heptacta-7000heptalia-8octa-80octaconta-800 octacta-8000octalia-9nona-90nonaconta-900nonacta-9000nonalia-
So, CX205HX412 is the molecular formula of pentadictane. CX7547HX15096 is heptatetracontapentactaheptaliane.
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