Organic Chemistry

I want to extract some caffeine from coffee. Is it plausible, and if so, how is it done? Thanks in advance!

I got a IR spectrum of my unknown compound and it shows a peak which is sharp(small in size) but not as strong as it should be for a carbonyl stretching at 1732. Also a small and bit broad peak at 3356 which confuses me the possibility of O-H stretching which is normally very broad. Please help me regarding this

Hey guys I'm looking for a nice drawing of a lab device for fractional distillation at low pressure with reflux ratio. I just can't find anywhere a reflux associated to a fractional distillation. I've seen Perkin triangle but I don't know how it gives me reflux ratio. Thank you! Antonio.

What would be a better nucleophile, ethanol or a bulkier alcohol? Such as isopropyl alcohol? Does size affect nucleophilicity? Thanks!

® 2-chloro- 2,3-dimethylpntane is monochlorinated to give C7H14Cl2 . Can anyone tell me how many optically inactive compounds\isomers will be formed and their structures with their rs designation?

Hi, I was wondering why the nitration of acetanilide requires the use of sulfuric acid AND acetic acid. I understand that the acid medium is used to solubilize the acetanilide, so why is concentrated sulfuric acid alone not enough? On a side note, the sulfonitric solution is prepared in another tube and later added to the acetanilide mix. As far as I know, the use of glacial acetic acid is to keep a low percentage of water, and thus, prevent hydrolysis, but this can be achieved using only the concentrated sulfuric acid. So, why is (glacial) acetic acid needed?

1) Discuss the characteristic functional features found in the alohols and acids that is missing in the ester. Discuss how its presence or absence allows the reactants to dissolve well in water but limits the ability of the product to dissolve in water and therefore causes it to float on the cold water in the watch glass. 2) Esters are oten a key component of oils pesent in flowers. What purpose would the ester serve in flowers? 3) Why do flowers have less smellon rainy cool dyas ad why does the rain not wash the esters away? Why did weplce the ester on a cooled watch glass in the lab and not on your skin? I have spend an hour researching these que…

Hello, I'm a writer. A character in my story commits suicide in a high school science lab. I based this character on a real life event from about 15 years ago. I remembered that the boy covered his mouth with formaldehyde, but as everyone here probably knows, that's unlikely to have happened. For the metaphor that I've set up to work, the child needs to do it in the lab, and I'm having a dickens of a time figuring out how to do it. Will anyone help me? Wanda

Hi, I'm a chemistry student and I'm having a lot of trouble understanding how to interpret NMR spectra... We were given an unknown molecule that we have to identify. I have done 13C , 1H, COSY, HQMC and HSQC nmr measurements and also an infrared spectra and mass spectra... and even with all these I can't figure out what my molecule is!! Here are the spectra: http://s294.photobuc...14/freya-freya/ So far from the 1H and 13C I think I have 6 carbons and 14 hydrogens, and I think there might be an N in there somewhere... But the mass says 387.1 (?!?!) (and I'm not even sure that's my base peak - how can you tell which peak is the base peak anyway?). I think the i…

I'm confused as to how hyperconjugation can exist in trans alkene isomers. In order for this to happen the antibonding and bonding pi orbitals have to physically overlap - how is this possible? Also, how does hyperconjugation provide a stabilizing effect - does it make it so the double bonded carbons "think" there's 8 electrons around them/next to them all the time vs. only part of the time like with pi bonds?

....................................CH3 ......................................| .............................CH3 - C – CH3 ......................................| ...........................CH3 - CH – CH2 – CH –CH3 ......................................................| ....................................................CH2 .......................................................| ............................CH3 – CH2 – CH2 – C – CH2 – CH2 – CH3 .......................................................| ............................................ CH3 – C – CH3 .......................................................| ...........................................…

Hi everybody, I am a new member to this forum and i want your help to get out of a synthetic problem with which i am strugling. I am trying to prepare a organic compound in which i have started with 2,6 dibromo 4-nitro pyridine(self preparaed), one bromo to be suzuki coupled with azaindole and the other bromo buchwald to be done with benzyl amine and finally the nitro to be converted to fluoro which gives me desired compound. Now the problem comes when all the couplings were done, the conversion of nitro to fluoro was failing. I tried in the following methods TBAF/dmf,sandmeyer reaction,HBF4/NaNo2 but failed. I also tried to fluorinate 2,6,dibromo …

So guys I had a look at Corey's 1988 synthesis of Ginkgolide B and came over an innocent-looking step - a Baeyer-Villiger-reaction...: Now, it took me a while to see, why it proceeded totally regioselective. Who knows the answer? (I mean, besides me ) (Note: I is not going to be the "usual" reason of migration preference, since the carbons next to the carbonyl are both secondary alkyls...) Hint: From which side is the peroxide going to come from?

Hi guys, I need some help working out this question It says, calculate the standard enthalpy of formation of NH3 from the following data H2 + 1/2 O2 = H2O. DeltaH=-286kJmol^-1 4NH3 + 3O2 = 2N2 + 6H2O. DeltaH=-1537kJmol^-1 My first thought was to draw out a thermochemistry cycle, but I'm not sure whether the enthalpy values given are for formation or combustion. Does it matter which of the two they are? Also, how would I go about working this out? The previous two questions asked for the equation of the first law of thermodynamics, which is deltaU=q+w and and equation that relates internal energy, enthalpy, pressure and volume, which would be deltaH=delt…

Hi everyone, I was wondering if anyone could help me with the following problem. We are supposed to make an ester by heating up an alcohol, an organic acid and sulfuric acid together. When the reaction is complete, we add a saturated aqueous solution of table salt to aid in the separation of the organic and inorganic layers. A precipitate of table salt will form when this is done. My question is, why does this occur? Is it maybe because the organic molecules interfere with the water's ability to interact with the salt's ions? Thanks in advance!

Hi All I would like to label some lipids that I have in order to produce labelled liposomes (I know that you can by Rhodamine-labeled lipid from Avanti, but I would like to use a different dye in my own lipids if possible). I cannot find any protocols in the literature or internet for this. My current lipids are: DOTAP, DSPC, PEG-CerC16 and Cholesterol. Is there any procedure to incorporate FITC or TRITC in any of these lipids? Thank you very much.

Dear All, As a project I need to analys oil content in a water sample. the sample is taken from the treated waste water plant. Already we have added some reagent to remove oil by scraping in DAF tank. But further I need to know whether the presence of oil in treated water. I have small in house lab and I kindly ask you to help me to do this by simple methods. Im seeking simple test method to quantify oil in water. Thank you

Hey there, I've tried doing these questions but it seems that I've some difficulties to work them out Could anyone please help me !!? Thanks a lot For the two compounds below, determine the order of priority of the substituents at the asymmetric centre and determine if it's R or S 1-Prozac: Choose 1-4 to assign the priorities. Priority of CH2CH2NHMe is (......) . Prioirty of H is (.....) . Priority of O-Ph-CF3 is (......) Priority of Ph is (......) 2-Efavirenz: Choose 1-4 to assign the priorities. Priority of C-(part of benzene) is (......) . Prioirty of C-(part of triple bond) is (......) . Priority of CF3 is (.....) . Priority of O-C=O is …

I did a test with the below question Which of the following is a reducing agent? a. cyclohexanol b. Na2CO3 c. MgSO4 d. NaOCl I couldnt figure out the answer I understood the following about each compound cyclohexanol is an alcohol and might be the product of a reduction Na2Co3 is a base sometimes used in acid neutralization MgSO4 I believe is a drying agent NaOCl is an oxidizing agent I thought there might have been a mistake in the question Anyone know what the correct answer should have been?

Hi , I am a postgraduate student of chemistry , I want to know about chemo informatics. Can any one help me in this regard thanks in Advance.....................

In studying Sn1, Sn2, E1, and E2 reactions; my textbook states that the bimolecular mechanisms are generally favored over the unimolecular ones. However, it doesn't elaborate much on why. Anyone care to shed some light on this?

Hello all, I have enjoyed the short time I have been on this forum reading all your questions and comments and learned a lot, having thought to myself "yes, I have had that same question as well!" I can see from the quality of the answers that there are some very smart people on here too I want to know if anyone who has some experience with polarimetry can direct me to some good resources for learning more about its use such as an internet site or a comprehensive book. I have found many websites that give the specific rotation for many of the sugars and other compunds such as organic acids and vitamins and some general information about the theory and how to cal…

I have a compound that looks like this COOH { H [[[[[[[[[[[[[[C1[[[[[[[[[[[[[ NH2 } NH2[[[[[[[[[[[C2[[[[[[[[[[[[[ COOH [ H I know that NH2>COOH so NH2 is 1st priority. But when I am assigning second priority to I give it the COOH at the top or do I look below and use the NH2 attached to the second stereocenter C2? I am unsure with a group such as NH2 which normally has higher priority than COOH will still still have higher priority when it is attached to another carbon and not attached to the stereocenter. Any ideas?

Hi everyone, I was just wondering if any knows of a simple way of extracting hesperidin from orange peels, preferably using easily obtained equipment. any ideas?

Hello Organic Chemists, I wanted to ask your advice as to what would be the most efficient process to convert hydroxymethylfurfural (HMF) to 2,5-dimethylfuran (DMF). Thanks!!