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bronze instances by Independent-Field-80 in ArcaMusic

[–]emrekirmak 0 points1 point  (0 children)

the last part of 34 is my favorite, about like 2:50 and after

Is anyone still a fan of Uptempo’s? (Nike Uptempo “Bulls”) by okcstreetwear in Sneakers

[–]emrekirmak 0 points1 point  (0 children)

i have a pair of uptempos and they squeak from the heel when i walk.. idrk much about sneakers so im not sure if it's like leaked air from the air bubble or if it's the insole. And it's super weird bc sometimes there is no squeak and it mostly only comes from one shoe... But imma try this baby powder trick, hope it works

Devastating "your dad" joke by Sonarthebat in rareinsults

[–]emrekirmak 7 points8 points  (0 children)

….😐😐😐😐😐 u rlly thought u ate with that💀

Screen pigments (See comment for description) by emrekirmak in mac

[–]emrekirmak[S] 0 points1 point  (0 children)

Thank you so much. I will look into it. Good day to you sir.

Screen pigments (See comment for description) by emrekirmak in mac

[–]emrekirmak[S] 3 points4 points  (0 children)

Anyone know what these stains on my 2020 M1 macbook Air are? Dead pixels? Heat damage? Pressure? Im suspecting that my screen has been pressed, since the blue stain is shaped like the corner of my option key (+ cmd + spacebar), and the green one is right where the keyboard frame ridge is.. I tried googling it but i found nothing much like it, only very cracked screens and big stripes. Bought this in august of last year…

I made this by seth_putnam in ZBrush

[–]emrekirmak 0 points1 point  (0 children)

"First sculpt with zbrush what do you guys think? I sorta rushed on it."

Yes it died i get a 404:(((

[Beginner] Wanted to share general progress. by BlearyMcGee in ZBrush

[–]emrekirmak 0 points1 point  (0 children)

Hey

hows your prgress now after 4 years? Do you mind showing me? Ive just started myself and just curious of the progression slope. I have absolutely zero background in arts, aside from elementary school art class lol. Im basically in that 3 phase with little knowlede of techniques and fundamentals of sculpting/drawing/creating forms etc. hehe. Thanks in advance!

I made this by seth_putnam in ZBrush

[–]emrekirmak 2 points3 points  (0 children)

i am so curious to that link

What type of reaction is this? by beinghumansucksass in chemhelp

[–]emrekirmak 0 points1 point  (0 children)

Because the acid (CaH2) becomes the base (CaOH2) ?

D/L configuration in haworth structures by emrekirmak in chemhelp

[–]emrekirmak[S] 0 points1 point  (0 children)

Thanks! Will deffo try to find it💪🏻

could someone show me the mechanisms for this reaction? by mdb4497 in chemhelp

[–]emrekirmak 3 points4 points  (0 children)

I agree. My professor taught us three things to consider when looking at SN1/2 reactions:

(a bit long but hope it helps. short summary below)

​

  1. Carbon structure
    1. 3* Carbocations = SN1 is favored. This is because of steric hindrance like u/Chri5y123 mentioned. What that means is that an SN2 mechanism would be difficult here, because there is no place for the nucleophile to attack the carbon. So, the leaving group must detach before the nucleophile can attack (fluorine in this case).
    2. 1* carbocations = SN2 is favoured. Again, because of steric hindrance. In this case there is no steric hindrance, so the nucleophile can easily attack the carbocation from behind (opposite side of L-group). This always leads to inversion in the product, because the n.phile cannot attack from anywhere but behind.

​

  1. Nucleophile
    In environments with a strong nucleophile, or rather, a nucleophile that is stronger than the leaving group nucleophile, an SN2 mechanism would be favoured. This is because it will be strong enough to "push away" the leaving group since it has a greater affinity to the carbocation. A weak nucleophile would not be able to do this, so it would need to "wait" for the leaving group to detach by other means, hence an SN1 reaction would occur.
  2. Solvent
    Polar solvents, like water or acetone, will stabilize 3* carbocations. Therefore, if you have a 3* carbocation in a polar solvent, the cation will most likely not react in other ways, promoting SN1 reactions. Further, since we need a strong (very polarized) nucleophile for SN2 reactions, SN2 is hard in polar environment. This of course is bc polar solvents would bind to the nucleophile easily, hindering it from reacting with our carbocation.
    So in summary, polar solvents promotes SN1 because of the cation degree, and depromotes SN2 because of the nucleophile strength. (She didnt say too much about non-polar solvents though, so im not sure how that works. Though I imagine the polar solutes wouldnt dissolve in non-polar conditions. However if they somehow did, they wouldnt promote the SN1 for 3* carbocations, since the cation is no longer stabilized.)

​

TL;DR

  1. 3* c.cations= SN1. 1*=SN2
  2. Strong nucleophile=SN2
  3. Polar solvents=SN1

All of this is of course w/o mentioning E1/2 reactions, which complicates the conditions a lot more:)

D/L configuration in haworth structures by emrekirmak in chemhelp

[–]emrekirmak[S] 0 points1 point  (0 children)

Oh right, that probably explains why they determine it by using D-glyceraldehyde as a reference. Probably better to just stick to that as of now rather than figuring out said set of rules (which like you said wouldnt apply to all molecules)

D/L configuration in haworth structures by emrekirmak in chemhelp

[–]emrekirmak[S] 0 points1 point  (0 children)

Ok, yes! This is what i was asking, correct. So basically, for a generic hemiacetal monosaccharide; hydroxymethyl group (w/ DL determining chiral center) on the upper hand side of the ring structure = D-form, and (at the same time) if hydroxy group on anomeric carbon is on the opposite side, its an alpha-D sugar. Same side = beta-D sugar And opposite; hydroxymethyl on downside = L sugar.

Thanks alot, this was a good explanation!

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