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Although I'm not the original author who added the Geocities link, I'm unclear on why it was deleted. I've read through the webpage and it appears to give a more thorough, in-depth discussion of the EZ system than the quick, almost summary, overview presented in the WP article. JeramieHicks ( talk) 19:46, 3 October 2008 (UTC)
Currently, [1] the article says this notation can be used for double bonds with "three of four" substituents. Is that a typo for "three or four" or rather "up to four"? -- Una Smith ( talk) 02:26, 14 March 2009 (UTC)
Needed additions: The E-/Z- nomenclature applies not only to substituted alkenes, but also, applies (unequivocally) to any disubstituted system with an sp2-hybridized (e.g., element-element, e.g., carbon-carbon double) bond; hence, it is used routinely, even overwhelmingly, in the pedagogy of modern
aldol reaction mechanisms, such as the Mukaiyama, to describe these
enolate reactants. There is much discussion of aldols in Wikipedia, including with syn-/anti- product descriptions arising from E-/Z-enolates. Hence, images and text describing stereochemical cases other than alkenes/olefins are needed in this article. See for instance,
Advanced Organic Chemistry. Part B: Reactions and Synthesis (5th ed.). Berlin, Germany: Springer Science & Business. 2010. pp. 64ff, esp. 67f and 98f, 82, 91, 88, 93.
ISBNÂ
0387683542. Retrieved 1 March 2016. {{
cite book}}
: Cite uses deprecated parameter |authors=
(
help), for a source to write these additions.
Cheers, Le Prof 50.179.252.14 ( talk) 21:06, 2 March 2016 (UTC)
Combined with the example given, it would seem to imply that E would generally coincide with trans and Z with cis. At the very least, we need to give an example where this is not the case (e.g. 2-bromobut-2-ene, where the E isomer would be the cis isomer). (And we should really expand this beyond the basic cases.) Double sharp ( talk) 04:11, 31 July 2016 (UTC)