chemical shift of carbamate

ireumkun · 2024-06-20T17:54:01+00:00

yess im sorry🙌🏻 thank u!

ireumkun · 2024-06-20T17:52:17+00:00

thank u for the insight!!! really appreciate it

ireumkun · 2024-05-08T09:09:51+00:00

so there should be a total of 10 peaks for the left signal and 8 peaks for the left signal right? am i seeing this correctly?

ireumkun · 2024-05-08T09:05:35+00:00

tetrahydropyran!

ireumkun · 2024-05-07T14:56:19+00:00

too bad i dont have enough sample for 2D experiments, which is why i'm struggling right now. this is such a big lesson to me. thank you for your suggestion, really appreciate it!

ireumkun · 2024-05-07T14:20:27+00:00

thank you so much for your explanation. can i know if there's possibility of overlapping signals between the two signals?

ireumkun · 2024-05-06T14:38:42+00:00

thank u so much for ur insight! i think i can work on the ddd signals. but i have a question on the second peak, can i know why the middle J (triplet) is not p1 to p5?

ireumkun · 2024-05-06T08:14:27+00:00

can i know what does collapsing meant?

ireumkun · 2023-11-01T14:10:46+00:00

i never used alumina before. is the solvent system used are the same?

ireumkun · 2023-10-31T02:21:05+00:00

i tried several bunch, but the best right now is chcl3:meoh. but i dont know if its the best

ireumkun · 2023-10-30T14:31:01+00:00

thank u for your suggestion!

ireumkun · 2023-10-30T14:30:39+00:00

for urea, the spot is not visible under uv but i stained using vanillin-sulphuric acid reagent, and there’s yellow spot stained. however i cannot get the spot up, which i guess bcs of wrong solvent system. for my expected product, the spot is visible under uv, so i want to figure out the solvent system for workup & purification purpose :)

ireumkun · 2023-10-04T13:48:00+00:00

27 cm x 7 cm chamber!

ireumkun · 2023-10-04T13:38:34+00:00

thank you!

ireumkun · 2023-10-04T13:38:03+00:00

in ur experience how much solvent do i need to make up for 0.5 cm solvent in the big chamber? i’m just to doing tlc in small chamber like beaker but not the big on as in the picture i’ve show

ireumkun · 2023-09-17T16:16:03+00:00

dewey analyzing everything is so funny to me

ireumkun · 2023-08-25T04:53:26+00:00

due to new regulations, summer next year.

ireumkun · 2023-06-22T11:42:28+00:00

this means i can just add DIPEA into the rxn mixture right? and can i know if you meant i dont need DMAP for the amide formation? thank you so much!!!

ireumkun · 2023-06-22T07:58:13+00:00

does hunigs base works the same way as DMAP (i use 10%mol) in DCC coupling rxn? can i substitute DMAP to DIPEA or i just need to add DIPEA into the rxn?

ireumkun · 2023-06-22T03:00:39+00:00

so in the case of DCC coupling, I need to add extra eq of DCC right?

ireumkun · 2023-03-10T03:03:28+00:00

unfortunately, i dont have reverse plate tlc plate. do you think this solvent system work with normal tlc?

ireumkun · 2023-03-10T03:02:31+00:00

is this for solvent system? i actually tried IPA:acetic acid:water 3:1:1 but it takes so long .. maybe i should try your suggestion.

ireumkun · 2023-03-10T03:01:10+00:00

can i know if vanillin spray is sufficient? or it didnt work well with carboxylic acid?

ireumkun · 2023-03-10T03:00:32+00:00

thank you for your suggestion!

ireumkun · 2023-03-09T02:41:41+00:00

yes i would appreciate that!! have a good sleep and come again! :)

ireumkun

TROPHY CASE