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The Hive => Chemistry Discourse => Topic started by: wolff_kishner on July 26, 2004, 11:12:00 PM

Title: Question about optical isomer notation
Post by: wolff_kishner on July 26, 2004, 11:12:00 PM

I am confused about the (+) and (-) abbreviations for describing optical isomers. The abbreviation page on this site indicates that (-) is dextro and (+) is levo. However, in other chemistry-related web sites and books that I have read, (+) is dextro and (-) is levo. Who is correct?

Title: Dextro - light rotates clockwise Levo - light...
Post by: ApprenticeCook on July 27, 2004, 01:42:00 AM

Dextro - light rotates clockwise
Levo - light rotates anti-clockwise

So that makes dextro (+) and levo (-)

Hope that helps.
Where is the page that says dextro is (-)???
-AC

Title: stereochemistry
Post by: longimanus on July 27, 2004, 03:48:00 PM

For those unfamiliar with stereochemistry nomenclature  reading IUPAC recommendations will be beneficial:

Stereochemical Terminology (http://www.chem.qmul.ac.uk/iupac/stereo/)

(http://www.chem.qmul.ac.uk/iupac/stereo/)

Title: Re: Where is the page that says dextro is...
Post by: wolff_kishner on July 28, 2004, 01:23:00 AM

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Where is the page that says dextro is (-)???

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The hive's own abbreviation page, in the FAQ section.

https://www.the-hive.ws/forum/showtext.pl?Cat=&Show=abbrev (https://www.the-hive.ws/forum/showtext.pl?Cat=&Show=abbrev)

Title: Must be a typo. I always get things like that...
Post by: ApprenticeCook on July 28, 2004, 06:24:00 AM

Must be a typo.

I always get things like that around the wrong way so i looked it up before i posted to make sure it was right...

-AC

Title: It is a typo, and we'll fix it.
Post by: Rhodium on July 28, 2004, 06:39:00 AM

It is a typo, and we'll fix it.