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Questions related from El-Sayed M El-Sayed
The post-sulfonation is one of the key methods to create Bronsted acid sites by insertion of sulfonic acid groups to the catalyst's surface. Sulfonated crosslinked polystyrene-exhibits lower...
02 February 2017 2,076 3 View
We know, it is possible to interpret pH for aqueous solutions.but what about non aqueous solutions (e.g. ionic liquids). Should the acid/base be an Arrhenius acid/base to correctly interpret pH?
08 August 2016 4,085 7 View
Dear researchers, Please guide me to convert cellulose fibers into powdered cellulose as I cant use it with its fibrous state, I have Cellulose nanocrystals as fibers I use some solvent systems to...
08 August 2016 407 2 View
if you need any paper you can just request it from me I can download many papers through many types of access
08 August 2014 6,245 1 View
My reaction was performed in pyridine and at the end of the reaction I evaporated the pyridine with co-evaporation by toluene. Then to obtain my cpd (benzoylated sugar) I just worked up...
04 April 2014 10,412 37 View
1-O-Acetyl-2,3,5-tri-O-benzoyl-b-D-ribofuranose is a key intermediate in the synthesis of ribonucleosides, purine, pyrimidine, and related nucleosides. Could anyone provide me with the method for...
03 March 2014 8,993 2 View
Commercial curcumin contains about 70 % curcumin and another two curcuminoids to modify curcumin structure. To synthesis new curcumin derivatives easily, can anyone provide me with a method to...
03 March 2014 2,202 1 View
In the field of organic synthesis the final product may be in the form of wax/oil during the work up to overcome this and to obtain the solid products what methods should be done?
12 December 2013 4,622 11 View
Elemental sulfur helps in thionation reactions. I want to know how it can help for progress of reaction.
10 October 2013 7,507 0 View
TLC which control progress of organic chemical reaction indicate formation of new proposed products which by knowing polarity of it theoretically can predict my new compounds.
10 October 2013 1,749 7 View
My compound contains 2OH groups, I want to react my compound with acetic anhydride to obtain one OAc and one OH free ( mono acetyled product ) not two OAc.
10 October 2013 9,756 13 View
TLC sheets are used for controlling the chemical reaction ,,,spots of compounds on TLC sheets make it useless again. What methods are used for purification these sheets?
10 October 2013 339 4 View
I need advice on how to make acetylation then bromination for galactose.
09 September 2013 3,702 9 View
Curcumin contain two OH groups, I want to perform selective mono acetylation.
09 September 2013 9,648 3 View
I will send anyone who has access for scifinder with proposed targets and he/she will resend the research results, only if possible.
09 September 2013 7,139 3 View
Silica gel is expensive and I want to know a cheap method for purifacation that I have used before.
09 September 2013 720 2 View
