Talk:Hexane

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removal - this

"The unusual toxicity of n-hexane (compared with other alkanes) has resulted in the chemical industry switching away from n-hexane in favour of n-heptane where possible.^{[citation needed]}"

First part is debatable (or unproven), second part doesn't appear to be true.

see http://www.cdc.gov/niosh/pel88/142-82.html "the ACGIH concluded that heptane was more acutely toxic than hexane. The ACGIH therefore recommended limits for heptane that are somewhat lower than the limits for the hexane isomers." , also "because NIOSH believes that "it would be incorrect to conclude that the neurotoxic properties ascribed to n-hexane are unique to this compound [n-hexane]. Other alkanes or related chemicals [such as heptane] that are ultimately metabolized to gamma diketone may have similar toxicity"

However it does say that OSHA believes hexane is unique.

Unless there is evidence for a switch the above statement seems unlikely, or simply wrong, especially considering the above report.83.100.251.196 (talk) 14:22, 18 September 2009 (UTC)[reply]

According to the article hexane is apparently odorless when pure. How pure does it have to be? I'm having a bottle of Hexane (ReagentPlus >=99% from Sigma-Aldrich, 139386-100ML) on the table and I can smell it immediately if I open it and I'm not under the fume hood. In the box on the right the article describes the odor as petrolic.Mooto85 (talk) 19:58, 20 January 2016 (UTC)[reply]

"see Table"

The 'Safety' section starts, "The acute toxicity of n-hexane is rather low, requiring grams per kilogram (see Table)." What table? Bruce Mardle (talk) 20:59, 12 April 2017 (UTC)[reply]

Thanks. Good catch.JSR (talk) 22:01, 12 April 2017 (UTC)[reply]

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mmHg? Shouldn't it be inHg?

No scientist but think this is inconsistent — Preceding unsigned comment added by 67.3.7.245 (talk) 00:24, 30 March 2022 (UTC)[reply]

Better opening to article

There are inaccuracies and inadequacies to this article introduction (at least), says this lifetime OChemist.

First, if indeed the only chemical meaning of the title term is for the normal isomer, why does a following sentence use boiling "points" in the plural? And, same sentence, why is the suggestion that the b.p. an approximate value (and why no STP or other statement of the conditions for the physical parameter reported)? Bottom line there, if the title term can only be understood as n-hexane, then it should be have a precise b.p., at a specified set of conditions.

But there lies the deeper problem. Hexane refers both to a specific compound (n-hexane), but also to a class of compounds, more generally, the C6 unsaturated hydrocarbons. ("That compound is a hexane. And that compound too is a hexane.") Hence, the Merriam-Webster and other definitions of the term, as "any of several isomeric volatile liquid alkanes C6H14 found in petroleum" (https://www.merriam-webster.com/dictionary/hexane). Both the given and the excluded uses of the term are common, and correct, and the omitted general MW-type definition should also appear near the opening of this article's introduction.

That correction made, it should be explicitly stated that referring to n-hexane as hexane represents a shorthand of the general sort that plagues students of OChem—that alongside formal, systematic naming, a variety of popular naming conventions still exist and are in regular use (the convention here being that the shortened name could refer to either n-hexane, or to the C6 class of various isomers). That "hexane" can refer to either means one must infer which meaning is in use from the context of any given occurrence of the term.

In addition to these confusing opening elements, the article goes on to say a number of other things that likewise suggest someone contributing/controlling the current content is not a real chemist, or lacks nuance and experience. For instance, you will hear only later that hexane can refer to a mixture of C6 compounds (whereas this is the sole MW definition), but when it appears, there is no mention of this being the consequence of it being a an industrial distillation fraction. And then it's said that some gasoline mixture—which one for heaven sake, these are carefully defined and specified—contains a fixed percent of "hexane". But surely, it cannot be the suggestion that in the formulation of gasoline mixtures, a very pure n-hexane product is added to give this fixed percent. Without consulting the source from which that "fact" was drawn (or engaging in a discussion regarding interpretation of that source), it's hard not to suppose that what the source means is that what is added in the formulation of the fuel mentioned is a volume of an industrial fraction of hexanes (and not n-hexane, as the article currently suggests).

All of this is to say that, by not properly defining the term at the opening—that it can be in one of two things—the authors of this introduction paint themselves into a a variety of corners. A good review/re-write along the lines suggested, by a broadly experienced organic chemist, perhaps a professor, is needed. 2601:246:C700:F5:C8AE:A4C8:CDD5:B7FA (talk) 22:16, 26 March 2023 (UTC)[reply]