Talk:Heterocyclic compound

message: Can be pentazole (pentaazacyclopentadiene, N5H) or cyclohexasilane (hexasilabenzene, Si6H6) considered to be heterocyclic compounds ? Is heterocyclic opposite of carbocyclic or homocyclic ? --Mykhal 22:05, 20 Nov 2004 (UTC)
replies: text: Well, I'll reply myself. I just have found out IUPAC definition of heterocyclic compounds: Cyclic compounds having as ring members atoms of at least two different elements.So.. they cannot be. --Mykhal 22:15, 20 Nov 2004 (UTC)
thread_title: Pentazole and cyclohexasilane

message: I support Olin's proposal for a merge with heterocycle, and I think this article should be the host page. Walkerma 06:38, 6 February 2006 (UTC)
thread_title: Merge notice

message: What about the possible cancer risk from heterocyclic amines in cooked foods? Shouldn't this warrant a separate article? http://www.cspinet.org/nah/6_98heat.htm Shanoman 23:50, 25 April 2007 (UTC)
thread_title: Health concerns

message: Common man, where are the silicon heterocycles!!?!?!?  they are very pertinent, due to their use in conjugated polymers.Gordonliu420 (talk) 06:06, 23 June 2008 (UTC)
thread_title: Silicon heterocycles

message: The section on heterocyclic amines and cancer seems out of place in this article.  Since heterocyclic amines redirects here from various food pages, it seems as if it is being used as a coatrack for the health concerns.  I'm moving the section to heterocyclic amines and working on that article. ChemGardener (talk) 18:17, 9 November 2008 (UTC)
thread_title:  Heterocyclic amines and cancer section 

message: Hello. Tetrahydro- prefix is not recommended by the IUPAC for the fully saturated heterocyclic compounds. So I am going to replace those names (three in total) in the image table using the Hantzsch–Widman nomenclature. --kupirijo (talk) 23:28, 17 March 2011 (UTC)
thread_title:  tetrahydro- 

message: "Heterocyclic compounds can be usefully classified based on their electronic structure. The saturated heterocycles behave like the acyclic derivatives. Thus, piperidine and tetrahydrofuran are conventional amines and ethers, with modified steric profiles. Therefore, the study of heterocyclic chemistry focuses especially on unsaturated derivatives, and the preponderance of work and applications involves unstrained 5- and 6-membered rings. Included are pyridine, thiophene, pyrrole, and furan. Another large class of heterocycles are fused to benzene rings, which for pyridine, thiophene, pyrrole, and furan are quinoline, benzothiophene, indole, and benzofuran, respectively. Fusion of two benzene rings gives rise to a third large family of compounds, respectively the acridine, dibenzothiophene, carbazole, and dibenzofuran. The unsaturated rings can be classified according to the participation of the heteroatom in the pi system."
This is too technical. It needs to be a few paragraphs further on... 
84.227.241.98 (talk) 08:30, 8 September 2014 (UTC)
thread_title:  Hard to understand 

message: Shouldn't 'ring structure' be linked to cyclic compound (more general) instead of to heterocyclic compound (more specific)?--Miguelferig (talk) 18:04, 6 April 2015 (UTC)
thread_title: Ring structure

message: #N: azecane/azecine
#O: oxecane/oxecine
#P: phosphecane/phosphecine
#S: thiecane/thiecine
#As: arsecane/arsecine
#Se: selecane/selecine
#Sb: stibecane/stibecine
#Te: tellecane/tellecine
#Bi: bismecane/bismecine
Alfa-ketosav (talk) 12:23, 29 July 2018 (UTC)
thread_title:  10-membered rings 

message: cyclo-Octasulfur: is this really a compound? It contains only one element.  — Preceding unsigned comment added by 118.211.184.241 (talk) 05:11, 27 December 2020 (UTC)
replies: text: Evidence#1: According to Allotropes_of_sulfur#Cyclo-octasulfur,_cyclo-S8, it is an allotrope of sulfur. Evidence#2: According to the Allotropy article, Allotropy or allotropism (from Ancient Greek ἄλλος (allos) 'other', and τρόπος (tropos) 'manner, form') is the property of some chemical elements to exist in two or more different forms, in the same physical state, known as allotropes of the elements. Allotropes are different structural modifications of an element;1 the atoms of the element are bonded together in a different manner. Therefore, the mini-conclusion from evidences #1 and #2 is that cyclo-Octasulfur is not a compound.-- Ktsquare (talk) 15:46, 28 July 2021 (UTC)

text: You missed the really key statement in Allotropy: "The term allotropy is used for elements only, not for compounds." The only evidence needed to declare that cyclo-Octasulfur is "not a compound" is to state that it contains only a single element, which is totally obvious from its own article, whereas compound is defined as more than one element. Any refs talking about other structural details are not needed. DMacks (talk) 15:58, 28 July 2021 (UTC)
replies: text:   I removed the image of S8, the sulfur allotrope. The IUPAC gold book reference for "heterocyclic compound" cited in the first sentence of the article specifically says that these must contain at least two elements. Mike Turnbull (talk) 16:53, 28 July 2021 (UTC)
thread_title:  cyclo-Octasulfur