Which type of bonds is more preferable when drawing chiral centers?
Wedged and hashed wedged/hollow wedged bonds or bold and hashed bonds?
While drawing the chiral centre if one draws the dotted wedge line formula it inturn also allows one to comment on its absolute configuration(R and S)
How shoud I switch off a rotary vane pump? Should I initially turn off the pump and then open the shutter to normalize the pressure? Or the order of the actions should be vice versa?
07 August 2019 3,353 3 View
How should one name an 1,3-dicarbonyl compound existing in enol form? According to IUPAC, should it be named as 1,3-dione or 3-hydroxy-2-en-1-one?
01 February 2018 4,735 0 View
I optimized two diastereomers in GAUSSIAN and got two values of total energy. So, I need to decide are these diastereomers energetically equal or one of them is more preferable termodinamically....
05 June 2017 362 5 View
What compound does result from Lawesson's Reagent after it thiolates smth?
10 November 2016 3,350 2 View
How to obtain dry DMF saturated with dry HCl?
09 October 2016 1,310 4 View
Does anybody have experience in ordering chemicals from Star Synthesis Co., Ltd? What was their contact information?
05 June 2016 4,812 1 View
Does anybody have experience in ordering chemicals from Shanghai Systeam BioChem.,CO Ltd? What was their contact information?
05 June 2016 3,464 1 View
Does anybody know where I can buy Ethyl 2-amino-4-methyl-5-phenylthiophene-3-carboxylate (CAS 4815-38-7)? We need 2kg of this compound.
05 June 2016 418 2 View
Are there any examples of Diels-Alder reaction in which carboxyl group (in acids or esters) acts as a part of a dien or a dienophile? What are the reasons of its inactivity in this reaction?
31 December 2014 2,602 3 View
Approximate concentrations are require in compared with the WHO permissible limts
11 August 2024 2,723 1 View
Hey there, As a synthetic chemist delving into theoretical calculations for my imidazolium-based organic molecules, I would greatly appreciate any guidance on the appropriate input instructions...
09 August 2024 5,444 7 View
I'm currently working on calculating the collision cross section (CCS) for various ions, and I'm facing challenges when dealing with sodiated and multiply charged ions. Most of the resources I’ve...
08 August 2024 8,329 0 View
Hi all, my experimental XPS results shown that my C3N5 sample consists of N-H bond, hence in this case I should incorporate the N-H bond into my DFT modelling. However, I do notice several papers...
07 August 2024 8,414 2 View
Hello What should be done to separate and identify organic acids in HPC when their RetTime is the same?Like oxalic acid with Propanoic Acid.or acids that have a very close RetTime.
07 August 2024 8,782 3 View
I used humic acid at 0.044 g/kg soil in my pot experiment. But finally, I have to recommend kg/ha. Each pot's soil weight was 11 kg. What is the solution?
02 August 2024 7,186 6 View
Hi everyone, I'd like to better separate two close peaks coming from a bioconversion sample, I'm currently using a C18 KromaPhase 4,6mm Ø.I. SCHARLAU, particle size (µm): 10, pore size (Å): 100,...
30 July 2024 435 3 View
I am currently working on a project involving liposomes and need to determine the maximum volume of siRNA that can be added to a 2.5 mL liposome solution with a total lipid concentration of 10...
30 July 2024 6,420 1 View
Dear Siesta Users, I installed Siesta 5.0.1 and I want to use Grimme's D3 correction. According to the 5.0.1 manual, I could use a few parameters to include the D3 correction in the...
27 July 2024 5,748 0 View
It has been long known that EDC carbodiimide and NHS easter's half life agains hydrolysis are highly related to pH. However, very surprisingly, not yet found a paper giving a table/chart of their...
25 July 2024 8,738 0 View