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Assessment comment[edit]

The comment(s) below were originally left at Talk:Alpha-Tocopherol/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.

Concerning the IUPAC name of alpha-tocopherol

The formulae of tocopherol is correctly given as C 29 H 50 O 2 but the name is given as (2R)-2,5,7,8-Tetramethyl-2-[(5R,9R)-(5,9,13-trimethyltetradecyl)]-6-chromanol. This makes the side chain C 17 H 35 but it should be C 16 H 33 because the formula would then be C 30 H 52 O 2. This name disagrees with the structural formula which is correctly "trimethyltridecyl" instead.

The correct name should be (2R)-2,5,7,8-Tetramethyl-2-[(4'R,8'R)-(4',8',12'-trimethyltridecyl)]-6-chromanol. then the carbons are tetramethyl=4 + trimethyl=3 + tridecyl=13 + chroman=9 -> total = 29. It is common in carotenoids to label the side chain with apostrophe's to clearly differentiate the side chain from the rings.

SimonWest777 (talk) 09:19, 28 September 2009 (UTC)Simon West

Last edited at 09:19, 28 September 2009 (UTC). Substituted at 07:27, 29 April 2016 (UTC)