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Questions related from Shu Er Tan
Etherification was carried out between aromatic -OH group and alkyl chloride in the presence of ethanolic KOH. The precursor is a bulky dye compound that consists of an aromatic -OH group and an...
05 May 2019 2,693 4 View
The sample is polymer and I sent this sample for analysis. The obtained DSC curve was kind of unexpected. The curve looks different from what I have studied and seen before. 1. Why the glass...
01 January 2018 8,584 9 View
I tried to extract the polymer through Soxhlet extraction. According to some references, the sequence for the organic solvents is methanol, acetone, hexane, toluene, and chloroform. The...
12 December 2017 4,974 3 View
I read that most previous studies used glass fibre thimble instead of the cellulose thimble. The solvents are methanol, acetone, hexane, toluene, dichloromethane, chloroform. If I use cellulose...
05 May 2017 1,469 3 View
The KOH absorb atmospheric moisture quite fast when I manually powdered it.
02 February 2017 3,966 4 View
2,5-dibromonitrobenzene (monomer) 4,4’-dibromo-2,2’-dinitrobiphenyl (dimer) The FTIR spectra for these two are basically the same. But the dimer spectrum shifted to the left. Isn't that when the...
02 February 2017 10,058 3 View
I would like to scan NMR for a compound name : 4,4'-dibromo-2,2'-diaminobiphenyl. According to some papers, the NMR solvents used are either CDCl3 or DMSO-d6. However, when I try to dissolve my...
01 January 2017 3,001 10 View
Is the HBr was added to prevent the formation of HBr as by-product from Br2 during the reaction (minimize the wastage of Br2)? And to move the reaction forwards faster?
12 December 2016 4,933 7 View
I get to know that the solvent DMF is technically similar to the DMSO for organic synthesis, just that DMSO can dissolve more compounds than the DMF. Is there any special reason that DMSO is used...
11 November 2016 6,751 7 View
I need this reagent but it's not possible to get this air to my place. I found that to synthesize N-butyllithium, I need Lithium. Anyone has alternative ways to synthesize N-butyllithium without...
10 October 2016 868 7 View
I have one bottle of 50 mesh copper powder, 96%. How can I get activated copper powder from that? Any suggestions? Thank you very much.
10 October 2016 6,224 3 View
If I have octylmagnesium bromide (2.0M in diethyl ether), how can I convert it into 2.0M in THF? Is there any possible pathway?
10 October 2016 6,728 2 View
I have a few packs of reusable dry ice-gel packs. They are sent along with the chemicals in a box for keeping the chemicals cool. Is it possible for me to use that "gel" as dry ice to reach the...
10 October 2016 9,057 5 View
If I have a DMSO in 98% with
08 August 2016 8,955 5 View
tributylchlorostannane vs trimethylchlorostannane. Which one is more preferable to be used for stille coupling?
06 June 2016 1,970 3 View
In the past researches, many PV polymeric backbones incorporate carbazole donor moieties with thiophene/thienothiophene(T/TT) as acceptor units. In the past few years, T/TT acts as Donors to the...
04 April 2016 3,482 2 View
If the group is non-reactive, why?
03 March 2016 8,264 4 View
