From: David Kelly (KellyDR$##$Cardiff.ac.uk)
Date: Wed Aug 07 2002 - 03:04:54 EDT
ee is enantiomeric excess. ie the percentage of the major enantiomer
minus the percentage of the minor enantiomer. To calculate the
percentage of the major enantiomer from the enantiomeric excess,
just add 100 and divide by 2. Percentage of minor enantiomer = 100
minus percentage of major enantiomer. Enantiomeric excess is a
hangover from the days when ees were measured by optical rotation.
Leaving aside some picky technical and semantic issues ee is the
same as optical purity. In effect, a polarimeter only measures the
amount of one enantiomer over the amount of racemate present,
hence enantiomeric excess.
Dave
Dr David R. Kelly
Dept. of Chemistry, Cardiff University, PO Box 912, Cardiff, CF10
3TB, UK
Phone 02920-874063: Fax 02920-874030
Mobile 07971-240448: Home 02920-610891
Web page http://www.cf.ac.uk/uwc/chemy/staff/kelly.html
For the "Elephants and Butterflies" article see
http://www.semiochemica.org.uk/articles/articlesidx.html
BEST Record: http://expertise.cos.com/cgi-bin/exp.cgi?id=498275
For catalysis see http://www.chemsoc.org/cgi-
shell/events/nforedisp.pl?ID=551
Cardiff University is the public name of the University of Wales,
Cardiff, a constituent institution of the
University of Wales.
_______________________________________________
ORGLIST - Organic Chemistry Mailing List
Website / Archive / FAQ: http://www.orglist.net
To post a message (TO EVERYBODY) send to everybody$##$orglist.net
To unsubscribe, send to everybody-request$##$orglist.net the message: unsubscribe your_orglist_password your_address
List coordinator: Joao Aires de Sousa (coordinator$##$orglist.net)
This archive was generated by hypermail 2.1.4 : Fri Sep 19 2003 - 12:16:54 EDT