| Who | When |
Messages | |
|
|
|
| Student
|
2591
|
 |
|
11-12-2009 11:42 PM ET (US)
|
|
Dear Dr. Norris,
On problem set two question 2 and 3. Does it matter what end group that you start with for the fischer projection. For example in 2a should the methyl group or the alcohol be at the top of the fischer projection. If it does not matter would the answer be corrected even if everything was oppisite of the online answere but your top and botton groups were switched. Thank you.
|
| Peter Norris
|
2592
|
|
|
11-12-2009 11:53 PM ET (US)
|
|
Student - the biochemical convention has the more highly oxidized terminal carbon at the top in a Fischer depiction.
|
| ztm
|
2593
|
|
|
11-15-2009 04:41 PM ET (US)
|
|
dr. norris...i was curious if there is ever a time when an Sn2 reaction will occur that is not 100% inverted and more than one isomer is formed. is there ever a situation as such?
|
| Waldo
|
2594
|
|
|
11-15-2009 08:35 PM ET (US)
|
|
Dr. Norris,
would you happen to know the date time and building in which our final will take place?
|
Peter Norris
|
2595
|
|
|
11-15-2009 09:47 PM ET (US)
|
|
ztm - there is a crossover, particularly in secondary systems, that sees the SN1 and SN2 mechanism compete. However, in 3719 we'll keep the two pathways distinct and say that SN2 gives complete inversion while SN1 gives a racemic mixture when chiral products are possible.
|
| Peter Norris
|
2596
|
|
|
11-15-2009 10:03 PM ET (US)
|
|
Waldo - according to the YSU website you will be taking the Chemistry 3719 final exam from 10.30-12.30 on Monday, December 7th in the Cushwa lecture room.
|
| asdf
|
2597
|
|
|
11-16-2009 04:35 PM ET (US)
|
|
Dr. Norris,
I don't know if this has already been asked, but does the lecture grade carry over into the recitation grade if the lecture grade is better?
|
| Peter Norris
|
2598
|
|
|
11-17-2009 03:31 PM ET (US)
|
|
asdf - separate grades.
|
| student
|
2599
|
|
|
11-17-2009 06:11 PM ET (US)
|
|
Dr.Norris,
On the Stereochem problem set 2, page 3, problem 3c, what is the D supposed to represent?
|
| Ochem Student
|
2600
|
|
|
11-18-2009 04:41 PM ET (US)
|
|
Student,
"D" is the heavy isotope of hydrogen called "deuterium". Deuterium commonly replaces alot of "hydrogen" atoms in common substances.
i.e... D20;deuterated water...CDCl3;deutero-chloroform..CD3OD;deuterated methanol etc.)
|
| Zane Kalik
|
2601
|
|
|
11-20-2009 12:36 AM ET (US)
|
|
Dr. Norris, in regards to sp hybridization, why exactly is it that an increase in "s" character correlates with an increase in acidity? Are hydrogen ions more readily dissociated due to the fact they are bonded to very electronegative carbons as in a molecule like Acetylene (sp)?
|
| anon
|
2602
|
|
|
11-22-2009 08:53 AM ET (US)
|
|
dr. norris, in the notes you said we will not be covering 9.7-9.14. but you have the mechanism for section 9.12. should we familiarie ourself with this mechanism then?
|
| Peter Norris
|
2603
|
|
|
11-22-2009 01:16 PM ET (US)
|
|
Zane - hopefully we got that covered in office hours.
|
| Peter Norris
|
2604
|
|
|
11-22-2009 01:16 PM ET (US)
|
|
Anon - 9.12 was covered in detail.
|
| anon
|
2605
|
|
|
11-22-2009 09:06 PM ET (US)
|
|
so is the mechanism from 9.12 the only one from that chapter?
|
| Peter Norris
|
2606
|
|
|
11-22-2009 09:53 PM ET (US)
|
|
anon - it's all in your notes, if you were in class.
|
