u/Choice-Plan-7559

SN2 mechanism with tertiary carbocation

SN2 mechanism with tertiary carbocation

Is my book misrepresenting this SN2 mechanism because it's showing a nucleophile attacking a 3° (tertiary) carbon? I thought that nucleophiles cannot attack tertiary carbons because of steric hinderance?

u/Choice-Plan-7559 — 3 days ago

SN1, SN2 reaction, or neither?

My book is saying that this reaction is neither an SN1 or SN2 reaction without giving any explanation or context. What makes this neither?

I've been trying to reason through the following:

  1. Electrophile/substrate: It will be 2°
  2. Nucleophile: H2O is unfavorable to attack the electrophile
  3. Leaving group: -OR, i'm not too sure about this but I think we can try protonating this because it's a poor leaving group? Could someone explain how we would use protonation?
  4. Solvent: No solvent is listed
u/Choice-Plan-7559 — 4 days ago

How to decide stability of leaving group?

So apparently my book is saying that the Bromide ion is a better leaving group than the -OT (tosylate) sulfonate ion.

I thought that sulfonate ions are typically more stable conjugate bases because of potential resonance structure. Can someone explain why the bromide ion is more stable in this case?

u/Choice-Plan-7559 — 5 days ago

When to use prefixes for E/Z and R/S

I'm getting some mixed answers for when to use prefixes to denote the location of E/Z and r/S.

Can someone explain when I would use prefixes to denote the location of the E/Z and r/S?

I know it has to do with when there is more than 1 double bond or stereocenter, but I'm not sure if this rule is consistent across both E/Z and r/S.

For example, is my book correct in using the prefixes even though there is only one of each?

u/Choice-Plan-7559 — 17 days ago

Physics 8A without prior knowledge + physics labs

I am taking Physics 8A this coming fall with Na Ji. I have no prior physics experience, having never taken it in high school.

How is this class without any prior knowledge?

Also, how are the labs for this course? I haven't seen anyone talking about it online.

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u/Choice-Plan-7559 — 22 days ago

Cis vs Trans

Why is this cis, not trans? I can see how someone might get confused as to what it is, but what I am specifically looking for when looking at the positioning of the atoms/groups?

Originally, I thought it was trans because I was looking at the parent chain and saw that both sides of the carbon end up on different sides of the double bond.

Edit: wow, isn't this a hot topic

u/Choice-Plan-7559 — 23 days ago

Why don't more high schoolers take community college classes?

I see community college as a good opportunity for high schoolers to earn college credits while also having the opportunity to take some interesting classes. Why aren't there more high schoolers taking these classes, even during the semester along with high school classes?

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u/Choice-Plan-7559 — 24 days ago

tert-Butoxide vs Ethoxide

Can someone explain why the ethoxide* is listed to have two hydrogens attached to the middle carbon, rather than it being H3C like the others?

*edit: tert-butoxide changed to ethoxide

u/Choice-Plan-7559 — 27 days ago

Resonance structures

How would I know to draw the boxed resonance structure? I only thought to draw the other 4, because wouldn't it be natural for the nitrogen to retain the lone pairs because of its electronegativity? Also, why doesn't the oxygen also become negatively charged?

u/Choice-Plan-7559 — 1 month ago

Resonance Structure

Do my resonance structures also work or do they have to be in this specific order laid out by the book? And why?

u/Choice-Plan-7559 — 1 month ago

Resonance Curved Arrow Pushing

Does it matter how you draw your arrows when using curved arrows for resonance? For example, in this problem, I started the tails of my arrows in different places from the textbook's answer. Does either way suffice, or is it more "stable" or realistic to use the textbook's answer and why? Should you always choose the shortest path for arrows?

u/Choice-Plan-7559 — 2 months ago

Bond-line notation drawing

How important is it for bond-line notation to be drawn in a specific way? I'm working through David Klein's Organic Chemistry as a Second Language book and the textbook answers seem to be different from what I would intuitively draw as the answer. Would either way be correct? I imagine there are many ways to draw the same molecule.

Edit: Thanks so much for all the responses, they are very helpful!

u/Choice-Plan-7559 — 2 months ago

Public Health 142 [online]

I'm thinking about taking Public Health 142 this summer online with Mi Suk Kang Dufour. How is this teacher, and how doable is the course in the summer if someone has zero experience with statistics or R? She's rated a 2.3 on RMP, so kinda worried about why she's not rated well.

Is this a recommended stats class for premed, or am I better off taking something like stats 2, 20, etc?

TIA

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u/Choice-Plan-7559 — 3 months ago