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Topic: Evelyn effect  (Read 24665 times)

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Offline abcc

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Evelyn effect
« on: November 25, 2006, 06:56:10 AM »
what is Evelyn effect  ???
thx ;)

Offline HP

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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

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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

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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

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Re: Evelyn effect
« Reply #4 on: November 27, 2006, 08:15:52 AM »
waaaaaaaaaa :o
very nice  ;D
thxthxthxthx ;)

Offline HP

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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

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