| Question
| # replies
| Last Post
|
| what is appropriate reagent for esterification of fluorinated acid & fluorinated alcohol ?
| 0 | Thu Jul 24
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| I have to do the TLC of trifluoroacetic acid & Ethyl acetate. What is the solvent system fot this?
| 0 | Thu Jul 24
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| 0 | Tue Jul 22
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| 0 | Tue Jul 22
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| 0 | Mon Jul 21
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| 0 | Mon Jul 21
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| 0 | Fri Jul 11
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| 0 | Fri Jul 11
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| 0 | Mon Jul 7
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| 0 | Mon Jul 7
|
| how can premature recrystallization be avoided?
| 0 | Thu Jul 3
|
| please suggest decarboxylation procedures. my compound is heat sensitive %3E150 temp. it decomposes.
| 1 | Thu Jul 3
|
| How to remove DMF in case I would like to obtain a polar compound? It seems the product goes to the H2O layer.
| 0 | Thu Jun 26
|
| What is the mechanism for benzil from benzoin
| 0 | Tue Jun 24
|
| i am unable to purify the epoxide(4-bromo, styrene epoxide) which consists non polar impurities and nearly 35 %25
| 0 | Tue Jun 17
|
| i am unable to check the TLC for phosphorylation raction with PCl3 and H3PO3 for carboxylic acid
| 0 | Thu Jun 12
|
| how to work up LDA reaction
| 0 | Wed Jun 11
|
| I made a HCl & methyl ester of L-proline complex. How do I get rid of HCl?
| 0 | Tue Jun 10
|
| I made a hydrochloric acid of an amino acid. How do I get rid of HCl?
| 2 | Tue Jun 17
|
| how to separate p-nitrobenzoic acid and aniline
| 0 | Thu May 15
|
| What happens when LAH was quench with dilute H2SO4?
| 0 | Tue May 13
|
| what TFA used for ?
| 1 | Thu 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?
| 1 | Fri May 9
|
| how can I evaluate old chemical reagents tha were stored in good conditions unopened
| 0 | Mon May 5
|
| All amides are water soluble.
| 1 | Tue May 13
|
| is potassiun chloride soluble in water
| 2 | Wed Apr 30
|
| is KCl soluble in water
| 1 | Sun Jul 6
|
| How do I track a colorless compound on a silica gel column, to know when it has run through?
| 1 | Wed May 21
|
| IS METHANOL SOLUBLE IN BENZENE
| 0 | Wed Apr 23
|
| WHY USE buffins in aspirin
| 0 | Sat Apr 12
|
| what is latrobeads and latrobeads chromatography
| 0 | Mon Apr 7
|
| experiment of recrystalisation of p-nitrobenzoic acid.
| 0 | Sun Apr 6
|
| Is it possible to use only methanol as an eluent on a neutral or basic alumina column; or will this inactivate/ dissolve the alumina?
| 0 | Sat Apr 5
|
| how to see the developed chromatogram of aliphatic aldehydes and alcohols?
| 0 | Sat Apr 5
|
| what is the procedure for bromination in presence of boc?
| 0 | Fri Apr 4
|
| If we r adding water in grignard reaction than what happen??
| 2 | Mon Mar 31
|
| what are the other reagent we can use in Boc deprotection??
| 2 | Tue May 13
|
| why we r getting less yield in Mannich reaction??
| 1 | Thu Jun 12
|
| which is more polar acetone or ethyl ether and why?
| 1 | Thu 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?
| 2 | Wed Mar 26
|
| why the idodide will appear as apeak in HPLC report
| 0 | Fri 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?
| 0 | Thu Mar 13
|
| I got flash silica 230-400 mesh with my final compound how could i purify my compound from the traces of silica.
| 1 | Tue Mar 25
|
| can ethanol be used as a solvent in column chromatography
| 1 | Thu Mar 13
|
| after the bromination of acetanilide, should i clean the glassware with acetone? why or why not?
| 1 | Wed May 21
|
| a better solvent system for technical grade endosulfan
| 0 | Fri Mar 7
|
| how can we increase detectiblity of tlc plates if sample to be loaded is quite in small quantity
| 2 | Tue May 13
|
| anisaldehyde shows two Rf s in dichloromethane. what does this mean?
| 1 | Thu Mar 13
|
| how can remove a anwanted peak in nmr speactra
| 1 | Tue May 13
|
| description of the appearance of impure vanillin
| 0 | Mon Feb 18
|
| peaks of 4-bromoacetanilide
| 1 | Tue Feb 19
|
| Proportion for benzene :ethylacetate :water
| 0 | Sat 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?
| 0 | Sun Feb 3
|
| My compound is in water.When I run TLC, it remains at the baseline itself. Suggest which eluent is to be used.
| 2 | Wed May 21
|
| Why use sodium thiosulfate when work up a Grignard reaction?
| 1 | Sun May 4
|
| What is the safest way to weigh out Pd/C?
| 1 | Tue Mar 25
|
| i think the silica gel just cracked..what should i do?? is my product lost now??
| 1 | Tue Mar 25
|
| work up of lah
| 5 | Fri Jun 27
|
| experiment of recrystallization of vanillin
| 2 | Wed Jul 23
|
| What is meant by metathesis?
| 1 | Thu Mar 13
|
| how to handle and quenching of all reducing oxidising reagents?
| 0 | Sat Dec 22
|
| how to handel LAH
| 2 | Sun Dec 31
|
| The squalene band (appears right at the top) is always very wavy and never turns up as a smooth band
| 0 | Mon Dec 17
|
| why is water the universal solvent
| 6 | Mon May 26
|
| How Do I Cean up a Product that is only Soluble in DMF
| 4 | Wed Jun 11
|
| How can I remove DMSO without using anything aqueous?
| 4 | Tue May 13
|
| how can we separate fatty acids , diffireent class of lipid using TLC
| 0 | Sat 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)?
| 5 | Tue Apr 29
|
| what would happen if the developing chamber was not covered with its lid in a TLC?
| 2 | Wed 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
| 1 | Tue Mar 25
|
| what does methanol:chloroform do?
| 0 | Sat Oct 13
|
| 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?
| 2 | Wed May 21
|
| What does solubility have to do with Chromatography?
| 2 | Wed May 21
|
| What is the importance of dark colored reagent bottle?
| 5 | Tue May 13
|
| reaction product rearrangment by silica gel
| 2 | Tue Mar 25
|
| what are the suitable solvents for resins?
| 1 | Tue Mar 25
|
| how to seperate excess ethyl bromo acetate from product
| 0 | Sat Sep 22
|
| What does digerated mean? (solid was digerated in boiling EtOH)
| 0 | Fri Sep 14
|
| is biphenyl soluble in benzene
| 3 | Mon Apr 14
|
| why benzene is not good solvent to crystallize biphenyl
| 0 | Thu Sep 13
|
| how to seperate two very close spots on tlc by silica gel column
| 6 | Tue Apr 8
|
| how i get acetone from ethanol?
| 1 | Mon Dec 3
|
| how i get isopropanol from ethanol?
| 0 | Sat Aug 11
|
| how i get the purity of ethyl acetate with good yield? i am preparing ethylacetate through esterification having 98%25 purity but 70%25 yield by using excess ethanol as compared to acetic acid, how i get good yield with high purity. i am also prepare butyl acetate and methyl acetate but these acetates give high purity and yield as compared to ethyl acetate?
| 0 | Sat Aug 11
|
| how to identify halogens on TLC using spray reagents?
| 0 | Tue Jul 31
|
| determination of phenols by TLC
| 0 | Sat Jul 21
|
| 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?
| 0 | Wed Jul 18
|
| How to separate spots with deltaRf values less than .1
| 2 | Wed Jul 16
|
| Two peak not separeted in HPLC
| 1 | Thu Jul 19
|
| why does solubility of aspirin needs to be taken into consideration
| 0 | Mon Jul 9
|
| why kcl give basic solution and NaCl give acidic one when soluble in water
| 0 | Fri Jul 6
|
| what steps that should be taken to solve the failure of the solute to recrystallize?
| 0 | Sat 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?
| 0 | Sat Jun 16
|
| how to dry the alcohol
| 1 | Tue Jul 3
|
| How to dry the acetone
| 3 | Tue Mar 25
|
| Standard NMR of NPG doent give the peak to carboxylic proton.Why?
| 0 | Tue Jun 12
|
| What the delta range of carboxylic proton in NMR?
| 2 | Tue Mar 25
|
| If I get peak for NH, then to confirm the peak due to NH we have to add D2O.But what my questn is adding D2O , all the protons in compound are xchanged by the D na. Is this possible?
| 20 | Mon Jun 23
|
| 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.
| 3 | Fri 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
| 7 | Tue Apr 8
|
| If our compound contains some impurities , then how can we come to isolate the pure one from TLC
| 3 | Tue Feb 19
|
| How can l remove salts (Li) from free amino acid?
| 1 | Sat Jun 9
|
| when I did 19F NMR I saw broad peak. What are the cuase to form that
| 3 | Tue Aug 21
|
| Is N-phenylglycine and L-(alpha) phenylglycine are same?
| 2 | Thu Jun 7
|
| What is meant by Nitrogen atmosphere, means if we carry out the reaction in Nitrogen atmosphere, how can we go through?
| 1 | Mon Jul 16
|
| How do synthesize N-Phenylglycine from anilne and chlroacetic acid OR aniline and ethyl chloroacetate
| 0 | Thu May 31
|
| If we not get the spot for reactant , then what its mean?
| 2 | Wed Nov 28
|
| amide reduction
| 1 | Sat Jun 23
|
| why all naturally occuring sugars are d-form?
| 1 | Fri Sep 14
|
| Best way to get rid of TMSCN from a reaction when used in excess?
| 1 | Mon Jul 21
|
| What is the procedure to quench raney nickel (deactivate completely)after reaction in large scale.
| 2 | Fri Jul 18
|
| SHELF LIFE OF PREPARES STANDARD AND INDICATOR
| 0 | Sat Apr 21
|
| What is the mildest workup method to remove formic acid from a reaction mixture containing palladium carbon and methanol?
| 1 | Fri May 4
|
| What is the best method of quenching the reaction of LAH and amide in THF?
| 8 | Fri Jun 27
|
| Why do the spots / compounds seperate in ethyl ether
| 0 | Fri Apr 6
|
| why do i get so much dimerization of alkyne in Sonogashira? I degas my solvents and use high-purity reagents
| 2 | Wed May 21
|
| 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.
| 1 | Wed Aug 15
|
| Does anyone have a good method for removing silanol byproducts other than chromatography?
| 3 | Tue 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
| 3 | Tue Feb 19
|
| How to predict the polarity of compound by just seeing the structure?
| 13 | Sun Jul 6
|
| what is polar
| 2 | Sun Jan 27
|
| My cmpound to be seperated is considerably soluble in chloroform. I dissolved it in chloroform and tried to seperate by silica gel column chromatography using chloroform and increasing amount of methanol. But the compouind sticks at the origin? Can you suggest why it happens?
| 583 | Sat Jun 14
|
| How to synthesise mdma
| 3 | Fri Oct 26
|
| 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?
| 4 | Thu Jun 7
|
| My column takes to much solvent & fraction are very very dilute what can i do.
| 3 | Wed 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?
| 1 | Mon Feb 26
|
| what is agood solvent system to use for 4-bromoacetanilide for starting material and 4-bromo-2nitroacetanilide?
| 5 | Thu Jun 21
|
| how we could tell by looking at tlc that our reaction is complete?
| 2 | Mon Jun 4
|
| which elluent can be used for to separate phenol , hydroquinone, catechol and quinone
| 0 | Tue Nov 28
|
| my compound have two chloro groups react with amine which chloro group is protected
| 0 | Mon Nov 27
|
| my reaction given nonpolar spots how to remove
| 0 | Mon Nov 27
|
| my reaction give product( Non Polar) with very similar rf how i can separate them
| 0 | Fri 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
| 3 | Sat 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.
| 0 | Tue Oct 17
|
| A student was asked to crystallize fluorenol (mp 153-154%BAC), and he/she selected benzyl alcohol (b.p. 205%B0C) because of its solubility characteristic. Do you think this solvent is a good choice? Why or why not?
| 1 | Mon Oct 23
|
| reaction meachisum of benzil from benzoin
| 4 | Fri Nov 17
|
| i want to purify my compound by crystallization in ethanol and water, how i can do it
| 2 | Mon 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.
| 0 | Mon Jul 24
|
| The 1H experiment is suddenly not sensitive with both ID and SW probe. So I can%A1%AFt get 1H spectrum of my samples (5-20mg). I can only observer solvent peaks and some peaks of samples when increasing nt (nt%3D128). How I can solve this problem? Thank you for your suggestion.
| 0 | Mon Jul 24
|
| how to remove(3-(trifluoromethyl)phenyl(phenyl))methanol from the reaction?
| 0 | Fri Jul 21
|
| how to count Rf from two dimension developt?
| 0 | Sat 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?
| 0 | Sat Jul 15
|
| On the TLC eluent, can we mix acitic acid n ammonium hydroxyde in one eluent?
| 0 | Thu 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?
| 1 | Fri 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?
| 0 | Mon Jul 10
|
| why diastereomers are different compounds,(MP,solubility,Polarity, Nmr) though chemical composition is same , only orientation in space is different ?
| 1 | Fri Oct 27
|
| wht happenig when we add naoh during the work up of lah
| 0 | Mon Jun 19
|
| HCl in Dioxane
| 2 | Fri Jun 16
|
| How can I reveal Ethylene Carbonate using TLC? What solvents or reagents can I use?
| 0 | Fri Jun 9
|
| what's the arrow pushing mechanism for the syntheis of dilantin?
| 0 | Mon May 8
|
| How to remove Benzyl Alcohol after reaction?
| 4 | Mon 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
| 3 | Tue Oct 17
|
| Is there an easy way to react a terminal alkyne to a thiol keeping both functional groups
| 0 | Tue May 2
|
| how does urea quench sodium nitrite?
| 0 | Mon May 1
|
| which runs lower on TLC benzoin or benzil
| 3 | Thu Aug 3
|
| how to select column elution
| 2 | Wed 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.
| 2 | Tue Jul 11
|
| my spots run out with the solvent, did not separate
| 3 | Thu Jul 13
|
| HPLC/TFA purification of a primary alochol resulting the formation of TFA-ester, how to remove TFA in AcN/H2O
| 1 | Thu 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.
| 0 | Wed Feb 1
|
| my reaction is benzoyl chloride and hydrazinehydrate .i kept in benzene but dimer formed how iget mono.
| 2 | Mon Sep 11
|
| What is better method to protect the Boc group and Deprotect the same.
| 4 | Thu Sep 7
|
| In case DMF as a solvent i want to remove the DMF but my vaccum pump is not that much good is there any other method of workup.
| 5 | Sun Jun 4
|
| when iam work up of TFA IN DE-BOC REACTION my compound is going in to water though i have adjusted ph it did%60 come .what can i do
| 6 | Mon Jul 17
|
| my reaction is between acid and amine in 20% MeOH,Chloroform it is trailing like tail how i prevent that.
| 0 | Thu Jan 19
|
| 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.
| 3 | Mon Feb 27
|
| how do purify a solid only soluble in MeOH, EtOH, and H2O? recrystallization seems to be tricky
| 1 | Fri Jan 27
|
| i found ethanol in my sample so how can i remove this from sample. ccl 4 i had alreadyb used
| 0 | Fri Dec 9
|
| how to work up a mitsunobu product of a relatively polar compound
| 1 | Fri 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.
| 0 | Sun 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?
| 3 | Sat May 13
|
| What is the best way to minimize solid losses while vacuum filtering?
| 3 | Thu Sep 21
|
| I cannot separate my ethyl acetate fractions using TLC,all the solents combinations i used will lift the sample up to or more than 3/4 of the plate but will not separateand i do not think that it fraction is one compound
| 3 | Thu Sep 28
|
| 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 ?
| 3 | Wed Sep 7
|
| if i have less polar components,should i use a less polar solvent system or more polar solvent system to separate them?
| 2 | Mon May 22
|
| I have dropped my reaction mixture into a silicone oil bath - can I recover it?
| 4 | Thu Mar 22
|
| Can the same plate be used simultaneously for locating different components using different spraying agents?
| 2 | Wed Jun 14
|
| Can an excessive amount of cotton wool affect the column resolution?
| 1 | Thu Jan 19
|
| I can' revel the N-acetylglucosamin on TLC silice. Is there a specific revelation for this oligossacharide?
| 1 | Sat Jun 17
|
| what precautions should be carried out to avoid the blockage of column after chromatography?
| 1 | Fri Aug 19
|
| What kind of TLC Solvent should I use for separation of maleimide group from maleiimic acid
| 4 | Thu Sep 7
|
| 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)
| 4 | Thu Apr 19
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| 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?
| 1 | Fri Mar 25 2005
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| Why doesn't the nitro group show dipole reactivity?
| 4 | Thu Nov 23
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