# What is the IUPAC nomenclature of alkane with large numbers of C atoms (more than 200)? - Tags: organic-chemistry, nomenclature - Score: 25 - Views: 7,057 - Answers: 2 - Asked by: lambda23 (2,538 rep) - Asked on: Nov 17, 2012 - Last active: Sep 9, 2016 - License: CC BY-SA 3.0 --- ## Question What is the IUPAC nomenclature for alkanes with large numbers of $\\ce{C}$ atoms (more than 200)? For example, what is the IUPAC accepted name for $\\ce{C\_{205}H\_{412}}$? --- ## Accepted Answer — Score: 27 - By: F'x (24,061 rep) - Answered on: Nov 18, 2012 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](http://www.iupac.org/publications/pac/1986/pdf/5812x1693.pdf) and [here as an HTML version](http://www.chem.qmul.ac.uk/iupac/misc/numb.html). In particular: > NT-1.1 - The fundamental numerical terms for use in hydrocarbon names or as multiplying prefixes for simple features are giv