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how does the 32Wed Jun 29
Work up problem: my reaction gives a mixture of an enolate and an alpha silyl alkoxide which after work up should give an acyl silane and alpha silyl alcohol. Unfortunately aqueos work up partially destroys both producs. I tried quenching the rxn with silica gel in hexanes and got less decomposition results but still the crude remains basic and hydrolysis of the acyl silane or brook rearrangement of the alcohol take place when I wash it with water or concentrate it ... any ideas? 6Mon Dec 29
what solvent system must i use to separate o-phenylenediamine on tlc?? 1Sat Aug 23
how to do work up ? 1Wed Oct 22
what is appropriate reagent for esterification of fluorinated acid & fluorinated alcohol ? 1Thu Sep 11
I have to do the TLC of trifluoroacetic acid & Ethyl acetate. What is the solvent system fot this? 0Thu Jul 24
how to distill liq.NH3 0Fri Jul 11
how to dry nitrogen gas 1Thu Sep 11
how can premature recrystallization be avoided? 1Fri Nov 28
How to remove DMF in case I would like to obtain a polar compound? It seems the product goes to the H2O layer. 2Fri Nov 14
What is the mechanism for benzil from benzoin 2Sat Oct 25
how to work up LDA reaction 2Fri Nov 28
how to separate p-nitrobenzoic acid and aniline 0Thu May 15
What happens when LAH was quench with dilute H2SO4? 1Fri Dec 26
what TFA used for ? 1Thu May 15
I use a gradient of chloroform, methanol, ammonium hydroxide (from 6:3:1 to as high as 3:5:2) to elute my very polar compound on silica gel column. Do you think my product is contaminated with silica gel? 1Fri May 9
how can I evaluate old chemical reagents tha were stored in good conditions unopened 1Fri Jul 25
All amides are water soluble. 1Tue May 13
is potassiun chloride soluble in water 2Wed Apr 30
is KCl soluble in water 2Tue Nov 18
How do I track a colorless compound on a silica gel column, to know when it has run through? 1Wed May 21
what is latrobeads and latrobeads chromatography 0Mon Apr 7
experiment of recrystalisation of p-nitrobenzoic acid. 3Tue Sep 2
Is it possible to use only methanol as an eluent on a neutral or basic alumina column; or will this inactivate/ dissolve the alumina? 0Sat Apr 5
how to see the developed chromatogram of aliphatic aldehydes and alcohols? 0Sat Apr 5
what is the procedure for bromination in presence of boc? 1Fri Dec 26
what are the other reagent we can use in Boc deprotection?? 6Thu Nov 20
why we r getting less yield in Mannich reaction?? 1Thu Jun 12
which is more polar acetone or ethyl ether and why? 1Thu Mar 27
My compound was isolated from water. NMR contains a peak at 1.69 ppm. Is it due to the residual water in the dried compound? 2Wed Mar 26
why the idodide will appear as apeak in HPLC report 0Fri Mar 14
how could i purify dissoled silica which i got with my compound while purification, my compound is lipid and very polar i was using chloroform: methanol: water 65:25:4 topurify and now got silica with compound. anyone know how could i get pure compound from this? 0Thu Mar 13
I got flash silica 230-400 mesh with my final compound how could i purify my compound from the traces of silica. 1Tue Mar 25
can ethanol be used as a solvent in column chromatography 1Thu Mar 13
after the bromination of acetanilide, should i clean the glassware with acetone? why or why not? 3Sat Nov 8
a better solvent system for technical grade endosulfan 0Fri Mar 7
how can we increase detectiblity of tlc plates if sample to be loaded is quite in small quantity 2Tue May 13
anisaldehyde shows two Rf s in dichloromethane. what does this mean? 1Thu Mar 13
how can remove a anwanted peak in nmr speactra 1Tue May 13
description of the appearance of impure vanillin 0Mon Feb 18
peaks of 4-bromoacetanilide 1Tue Feb 19
Proportion for benzene :ethylacetate :water 0Sat Feb 9
trying to replace a tosyl group with a diethyl amine, all literature says it is very easy to do, but no one reports conditions. anyone ever done this? 0Sun Feb 3
My compound is in water.When I run TLC, it remains at the baseline itself. Suggest which eluent is to be used. 2Wed May 21
Why use sodium thiosulfate when work up a Grignard reaction? 1Sun May 4
What is the safest way to weigh out Pd/C? 2Fri Dec 26
i think the silica gel just cracked..what should i do?? is my product lost now?? 1Tue Mar 25
work up of lah 5Fri Jun 27
experiment of recrystallization of vanillin 2Wed Jul 23
What is meant by metathesis? 1Thu Mar 13
how to handle and quenching of all reducing oxidising reagents? 0Sat Dec 22
how to handel LAH 2Sun Dec 31
The squalene band (appears right at the top) is always very wavy and never turns up as a smooth band 0Mon Dec 17
why is water the universal solvent 28Sun Dec 21
How Do I Cean up a Product that is only Soluble in DMF 4Wed Jun 11
How can I remove DMSO without using anything aqueous? 5Wed Dec 3
how can we separate fatty acids , diffireent class of lipid using TLC 0Sat Oct 27
When washing isopropanol out of DCM with sat. sodium carbonate no solvent partition is seen (even when copious amounts of brine is added)? 5Tue Apr 29
what would happen if the developing chamber was not covered with its lid in a TLC? 2Wed May 21
what would happen if one edge of the TLC plate was immersed in the eluent before the other when placed in the developing chamber 1Tue Mar 25
what does methanol:chloroform do? 1Tue Oct 14
Can the solvent used in the column chromatography be used again?If so how can a solution containing hexane, dichloromethane,ethyl acetate be distilled and used again? 2Wed May 21
What does solubility have to do with Chromatography? 2Wed May 21
What is the importance of dark colored reagent bottle? 5Tue May 13
reaction product rearrangment by silica gel 2Tue Mar 25
what are the suitable solvents for resins? 1Tue Mar 25
how to seperate excess ethyl bromo acetate from product 0Sat Sep 22
why benzene is not good solvent to crystallize biphenyl 0Thu Sep 13
how to seperate two very close spots on tlc by silica gel column 6Tue Apr 8
how i get acetone from ethanol? 1Mon Dec 3
how i get isopropanol from ethanol? 1Mon Nov 17
how to identify halogens on TLC using spray reagents? 2Tue Sep 23
determination of phenols by TLC 1Wed Oct 1
After I spot and run the plates, my ending result is a line of all the compounds together, as if they are a shadow of the mobile phase. They only behave in such a manner with the current .100 M Bile Salt solution what is the cause? 0Wed Jul 18
How to separate spots with deltaRf values less than .1 2Wed Jul 16
why does solubility of aspirin needs to be taken into consideration 0Mon Jul 9
why kcl give basic solution and NaCl give acidic one when soluble in water 0Fri Jul 6
what steps that should be taken to solve the failure of the solute to recrystallize? 0Sat Jun 23
When making a custom SiO2 TLC plate how does one know the loading ratio for a given thickness? Also how does one make the SiO2 adhere to the glass better? 0Sat Jun 16
Standard NMR of NPG doent give the peak to carboxylic proton.Why? 0Tue Jun 12
What the delta range of carboxylic proton in NMR? 2Tue Mar 25
has any one worked with tBuO-Li? I have it as a solid. The rxn is to substitute F in 3-Chloro,2, 4, 5-trifluoropyridine. The product should be 4-tBuO 6-tertBuO isomer. I have not get any :( What could be a problem? -78C, Ar. And also, st mat and rxn products are very difficult to see on TLC (low UV activity, pretty conc samples). Why??? Pyridine itself never a problem. 3Fri Jun 27
our compound is highly polar,i.e., it is soluble in methanol.we have tried different solvent systems for TLC including Methanol :Chloroform.the compound jus pops up from the spotted area even after increasing the percentage of TLC solvent system.can you suggest me how to solve this 8Tue Dec 9
If our compound contains some impurities , then how can we come to isolate the pure one from TLC 3Tue Feb 19
How can l remove salts (Li) from free amino acid? 1Sat Jun 9
when I did 19F NMR I saw broad peak. What are the cuase to form that 4Thu Oct 16
Is N-phenylglycine and L-(alpha) phenylglycine are same? 2Thu Jun 7
What is meant by Nitrogen atmosphere, means if we carry out the reaction in Nitrogen atmosphere, how can we go through? 1Mon Jul 16
How do synthesize N-Phenylglycine from anilne and chlroacetic acid OR aniline and ethyl chloroacetate 0Thu May 31
If we not get the spot for reactant , then what its mean? 4Fri Dec 26
why all naturally occuring sugars are d-form? 1Fri Sep 14
Best way to get rid of TMSCN from a reaction when used in excess? 1Mon Jul 21
What is the procedure to quench raney nickel (deactivate completely)after reaction in large scale. 3Fri Dec 26
What is the mildest workup method to remove formic acid from a reaction mixture containing palladium carbon and methanol? 1Fri May 4
Why do the spots / compounds seperate in ethyl ether 0Fri Apr 6
why do i get so much dimerization of alkyne in Sonogashira? I degas my solvents and use high-purity reagents 3Wed Nov 19
What is the best method for removal of the hydrazinedicarboxylate byproduct following Mitsunobu? Even if the Rf of my product is much higher, I still have contamination after column chromatography. 1Wed Aug 15
Does anyone have a good method for removing silanol byproducts other than chromatography? 3Tue Feb 19
My product is in almost neutral solution or may be silghtly basic PH 8-9 can I use ethyl acetate as extracting solvent my compound is soluble in ethyl acetate and in water 3Tue Feb 19
what is polar 2Sun Jan 27
My compund shows thick line in the TLC and I do not see any separated spot. I have also tried with all possible solvents and still i face the problem but am sure that my comund has impurity which can not be separated in TLC. what to do? 4Thu Jun 7
My column takes to much solvent & fraction are very very dilute what can i do. 3Wed Mar 28
my aqueos extract spots never seem to migrate with any solvent system, even if they do, it is to a very less extent. What should i do? 1Mon Feb 26
how we could tell by looking at tlc that our reaction is complete? 2Mon Jun 4
which elluent can be used for to separate phenol , hydroquinone, catechol and quinone 0Tue Nov 28
my compound have two chloro groups react with amine which chloro group is protected 0Mon Nov 27
my reaction given nonpolar spots how to remove 0Mon Nov 27
my reaction give product( Non Polar) with very similar rf how i can separate them 0Fri Nov 10
Which of the following solvent pairs can be used for recrystallization? why or why not? Acetone and ethanol, hexane and water, hexane and diethyl ether 3Sat Nov 11
how to purify long chain alkyldiamine by column chromatography? Which is the best stationary and mobile phase? Which is the best stain fot the compound detection on tlc plate. 0Tue Oct 17
i want to purify my compound by crystallization in ethanol and water, how i can do it 2Mon Oct 23
The 1H experiment is suddenly not sensitive with both ID and SW probe. So I can not get 1H spectrum of my samples (5-20mg). I can only observer solvent peaks and some peaks of samples when increasing nt (128). How I can solve this problem? Thank you for your suggestion. 0Mon Jul 24
how to remove(3-(trifluoromethyl)phenyl(phenyl))methanol from the reaction? 0Fri Jul 21
how to count Rf from two dimension developt? 0Sat Jul 15
how to use the result of TLC where is with two dimension developt on flash column?Can that eluent avaliable for flash column? 0Sat Jul 15
On the TLC eluent, can we mix acitic acid n ammonium hydroxyde in one eluent? 0Thu Jul 13
my sample from latex Antiaris toxicaria, Lesch. what are suitable eluen compose to separate on TLC silika gel. n what good solvent to dissolve the extract for spotting? 1Fri Jul 14
In the TLC , I used n-butanol :aceticacid: water in 4:1:5, but the elution is not uniform, the solvents are eluted separately from the water , what tis the solution of this problem? 0Mon Jul 10
why diastereomers are different compounds,(MP,solubility,Polarity, Nmr) though chemical composition is same , only orientation in space is different ? 1Fri Oct 27
wht happenig when we add naoh during the work up of lah 0Mon Jun 19
HCl in Dioxane 2Fri Jun 16
How can I reveal Ethylene Carbonate using TLC? What solvents or reagents can I use? 0Fri Jun 9
what's the arrow pushing mechanism for the syntheis of dilantin? 0Mon May 8
How to remove Benzyl Alcohol after reaction? 4Mon Jul 17
my nmr contains a peak at 1.47 delta ppm which is not my compound peak and not solvent residual peak what should i do 3Tue Oct 17
Is there an easy way to react a terminal alkyne to a thiol keeping both functional groups 0Tue May 2
how does urea quench sodium nitrite? 0Mon May 1
which runs lower on TLC benzoin or benzil 3Thu Aug 3
how to select column elution 2Wed Aug 16
My compound is highly soluble in water and sparingly soluble in organic solvents liek MC, EA, how can I separate my compound from other similar byproducts? ? Crystallization doesnt seem possible. 2Tue Jul 11
my spots run out with the solvent, did not separate 3Thu Jul 13
HPLC/TFA purification of a primary alochol resulting the formation of TFA-ester, how to remove TFA in AcN/H2O 1Thu Jun 22
in tlc of reaction benzoyl chlorideand hydrazine hydrate benzoylchlorede spot and product spot comes where. i n product and reactant which is more polar. 0Wed Feb 1
my reaction is benzoyl chloride and hydrazinehydrate .i kept in benzene but dimer formed how iget mono. 2Mon Sep 11
What is better method to protect the Boc group and Deprotect the same. 4Thu Sep 7
During workup after the LAH reduction(used for the reduction of P-Cl bond to P-H bond), While workup though the sepeteration of ether and aqeous layer is good, but the ether layer contains some emulsion, which contains water, What I have to do to get a clear organic layer. 3Mon Feb 27
how do purify a solid only soluble in MeOH, EtOH, and H2O? recrystallization seems to be tricky 1Fri Jan 27
how to work up a mitsunobu product of a relatively polar compound 1Fri Oct 27
I have carried a reaction of different piprazines for aryl derivatives but found the sepration of the product so formed because during the column chromatographyboth amine and the product elutes even in first or second fractions. 0Sun Aug 28
I am working on a small scale reaction (1 ml-3 ml) with a very viscous solvent (1000x more viscous than water). Do you any suggestions on how to stir this reaction mixture? 3Sat May 13
What is the best way to minimize solid losses while vacuum filtering? 3Thu Sep 21
i have a mixture of phenols.i find it very hard to get the separation done very well coz all components hav very close Rf vales.what can i do ? 3Wed Sep 7
Can the same plate be used simultaneously for locating different components using different spraying agents? 2Wed Jun 14
Can an excessive amount of cotton wool affect the column resolution? 1Thu Jan 19
I can' revel the N-acetylglucosamin on TLC silice. Is there a specific revelation for this oligossacharide? 1Sat Jun 17
what precautions should be carried out to avoid the blockage of column after chromatography? 1Fri Aug 19
Why does all the silica gel flake off my glass plate as soon as I immerse the end in liquid? (water, 5 mM EDTA, etc) 4Thu Apr 19
I separate two isomers of carotene in a flash chromatography column, using silica gel adsorbent and using ethyl acetate/hexane eluent. When the polarity is reduced, the position of two compound change. In high polar mixture I suppose the trans isomer is that has reduced retention. Is it possible to happens? 1Fri Mar 25 2005
Why doesn't the nitro group show dipole reactivity? 4Thu Nov 23

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