March 28, 2024, 12:00:05 PM
Forum Rules: Read This Before Posting


Topic: Evelyn effect  (Read 25824 times)

0 Members and 1 Guest are viewing this topic.

Offline abcc

  • Regular Member
  • ***
  • Posts: 86
  • Mole Snacks: +1/-5
Evelyn effect
« on: November 25, 2006, 06:56:10 AM »
what is Evelyn effect  ???
thx ;)

Offline HP

  • Chemist
  • Full Member
  • *
  • Posts: 350
  • Mole Snacks: +33/-5
  • Gender: Male
Re: Evelyn effect
« Reply #1 on: November 26, 2006, 04:42:58 AM »
From google search: "Background on the Evelyn Effect
David Todd, a professor at Pomona College, was dehydrating 2-methylcyclohexanol using an acid catalyst. As the product was distilling, he was interrupted by the department secretary. Out of curiosity, he collected the remaining distillate in a separate vial to see if the product composition differed from the earlier fraction. Using a gas chromatograph, he discovered that the product ratios varied as the reaction proceeded. The discovery was named after his secretary: The Evelyn Effect. The Evelyn Effect is defined as the phenomena in which the product ratios in a reaction change as the reaction proceeds."
Really interesting phenomena :)
xpp

Offline chiralic

  • Full Member
  • ****
  • Posts: 234
  • Mole Snacks: +19/-3
  • Gender: Male
  • Test
Re: Evelyn effect
« Reply #2 on: November 26, 2006, 10:32:38 PM »
Hello abcc:

Check this link:

http://www.cachesoftware.com/teach/ (look at chapter or part 5, there you can find several pages
about Evelyn Effect)

or look at into the Journal of Chemical Education (1994) Vol 71, pag 440 a original paper of Evelyn Effect
by David Todd. ( http://jchemed.chem.wisc.edu/Journal/Issues/1994/May/index.html )

Regards,

Chiralic

Offline Ψ×Ψ

  • Chemist
  • Full Member
  • *
  • Posts: 263
  • Mole Snacks: +8/-4
  • ooh, shiny!
    • carbon-based curiosities
Re: Evelyn effect
« Reply #3 on: November 26, 2006, 10:40:01 PM »
Huh.  I'd never heard of that, but it does explain what one of my reactions was doing a while back.

Offline abcc

  • Regular Member
  • ***
  • Posts: 86
  • Mole Snacks: +1/-5
Re: Evelyn effect
« Reply #4 on: November 27, 2006, 08:15:52 AM »
waaaaaaaaaa :o
very nice  ;D
thxthxthxthx ;)

Offline HP

  • Chemist
  • Full Member
  • *
  • Posts: 350
  • Mole Snacks: +33/-5
  • Gender: Male
Re: Evelyn effect
« Reply #5 on: November 27, 2006, 02:50:38 PM »
Some time before i had similar "laboratory incident" with one charming secretary and the effect was similar to me ;)  Wow i cant remember her name now :P
xpp

Sponsored Links