Organic Definition and 432 Threads

Hello again, sorry I had been idle for months. At that time I was relatively active in the Physics section. Thank God now I'm at the Fac. of Medicine, University of Sriwijaya. In the beginning of my college we had a Chemistry Lab Practice and are assigned to make the report, in which the...

1. Homework Statement Okay, I just started working on my unknown in Lab and I got stuck with a liquid. First I determined the boiling point, my professor told me to let this step go for 30 minutes and it plateaued at around 147°C. I did this twice the first time I didn't do it as long and got...

Homework Statement (see uploaded attachment for picture). I basically have to name this molecule. The Attempt at a Solution I don't know where to start counting for the longest carbon chain and I'm not sure if it's a nonane or octane. If you guys can help it'd be much appreciated

I am having difficulties studying for organic chemistry. The concepts don't seem especially difficult, but I am not performing where I want to be at in this class (1st semester organic chemistry). I do fine in math and physics, and even did well in general chemistry, but it seems the skills...

Homework Statement Hi. I'm pretty much a beginner in organic chemistry and I'm just wondering something. For example, I know that HCl is a stronger acid than HF. But... then why the following happens if a have an organic acid (e.g a carboxylic acid)? According to what I see, a...

I suppose this is the right place to post this. I have been studying organic chemistry from more than three-four months and i can't even remember the basic reactions. There seems to be so many reactions which i need to memorize. Whenever i sit to do questions on the reactions, i always need to...

Homework Statement But-2-ene reacts with bromine in the presence of concentrated aqueous sodium nitrate to give the following compound CH3-C(H)(ONO2)-C(H)(Br)-CH3 Which of the following statement is correct. a.the electrophile is NO2+ b.Only 2,3-dibromobutane is formed. c.Resultant...

Why is it that when you have an organic compound with a charge on the C, that charge takes the place of one hydrogen bonded to that C?

Hi, I just read a paper about charge transport in organic semiconductor. There, it was mention that from electrochemical experiments, it is well known that after the removal of one electron from an individual molecule, more energy is required to remove a second electron. I'm still confuse...

Hi, During fractional distillation,crude oil is heated to a certain temperature,then it is pumped into the fractional tower. As you know,petroleum is a mixture of alkanes.When it is heated in the furnace(to about 400°C),it does not burn.But lower alkanes(e.g.CH4) are extremely flammable,why it...

In substitution reaction between bromine and hexane, why the bromine should be in organic solvent? Bromine is already a liquid!

Homework Statement In an organic compound of molar mass > 100 containing only C, H , N, the percentage of C is 6 times the percentage of H while the sum of the percentages of C and H is 1.5 times the percentage of N. What is the least molar mass? Homework Equations C% + N% + H%= 100%...

Homework Statement find the functional groups in the following compound: Homework Equations C8H16O4The Attempt at a Solution I know there is an ether but there is also something else. What is it? I have tried to find a group that is in the compound, but I have had no luck. It seems to be only...

Homework Statement http://img51.imageshack.us/img51/9563/chem3.png Homework Equations The Attempt at a Solution I know the answer has to be a or c because you need the ammonia to make this reaction happen but I don't know whether you would want to use 3-oxobutanenitrile or...

How to see if there is a nucleophilic or electrophilic attack? Nucleophilic or electrophilic attack? What type of attack performs a) the water molecule in the attack with one of its free electron pairs? b) bromine molecule when in an attack with a double bond? Motivate! I think...

So I came across a cool toxin, and saw that people have not assigned an IUPAC name to it, so I took on the challenge. The compound of interest is Batrachotoxinin A unc. edu/depts/mtcgroup/litmeetings/batrachotoxinin.pdf In the second slide Batrachotoxinin A has an R which is an H...

Attached is the image of the desired structure, my question is based on what is pictured as (CH3)2HC- I represented this group as C3H7 which does seem like the logical equivalent, but just being safe here. Am I right? Thank you!

I am chem major currently taking organic chemistry. I am ashamed of admitting I hate organic chemistry. This is not even science. It seems to me though, it is a branch of engineering. You have stuff, you make new stuff. You increase your yield and figure out steps to synthesize something. I...

Hi, this is my first post. I'm generally more of a blog/message board reader than a contributor, but there's really been something that has been eating away at me, making it difficult for me sleep at night. (Note: long post coming up) Last semester in Organic Chemistry I, I made a huge...

Can someone tell me how to name BINAP R or S? IT has NO chiral centres and I haven't got a clue of how to name it!

Hey, How would I name (IUPAC) the isomer of C2H4O that is a triangular ring with C at two vertices and O at the third? Also, I'm trying to name the 11 isomers of C3H6O. So far I have 10 and I can't seem to get the last one. The ones I have are: propanal propan-2-one prop-2-en-1-ol...

Organic chemistry reaction Help . !URGENT! Homework Statement I can't type the O-Compounds so here's the Question http://dl.dropbox.com/u/41389643/Photo%2001-03-12%204%2047%2021%20PM%20%281%29.jpg Homework Equations The Attempt at a Solution This is the first time I came...

which is the best leaving group? Cl- enolate NR3 I couldn't figure out how to draw the enolate here, but it is a basic 3 carbon one. I believe the answer is Cl because resonance on the enolate will disperse the neg. charge. Am I on the right track or is there a factor I am missing?

Homework Statement Find the product of this http://www.webassign.net/ksorgchem2/14-P-019e1.jpg The Attempt at a Solution I tried this but it is wrong. http://www.webassign.net/marvinimages/e/d/b3dfb33e165ce17f7b0a8bab7b9d9d.png Not really sure what to do now.

dienophile and diene help?? organic chemistry We never really covered how to do diels alder reactions and I am having trouble how to do these. Here is a photo of the lab page with the questions. I just need help with 2a-e and 3b-3d. Thanks.

There is a compound 1-fluoro,1-chloro,1-bromo, propanone (a substituted ketone). If we react it with an alkali, we know alkali will attack carbonyl carbon and chloro-fluoro-bromo- methyl carbanion will be the leaving group, finally acetic acid and chloro-fluoro-bromo- methane will be formed...

Homework Statement A carbanion is a species that contains a negatively charged, trivalent carbon. (a) What is the electronic relationship between a carbanion and a trivalent nitrogen compound such as NH3? (b) How many valence electrons does the negatively charged carbon atom have? (c) What...

Hello! I am confused about the protein interactions that occur when either salt concentration is increased or an organic solvent is introduced. When salting out, wiki says: "Addition of a neutral salt, such as ammonium sulfate, compresses the solvation layer and increases protein-protein...

Homework Statement 4-isopropyl-2,5-octene or 4-isopropyl-2,5-dioctene? 2. The attempt at a solution 4-isopropyl-2,5-octene

I don't know where to ask this question, but anyways, since it was asked in an exam, so finding out the correct answer afterwards is a moral responsibility as a homework. So here I am. My question is whether the compound 2-Hydroxy-5-nitrobenzaldehyde (Did I named correctly?) gives positive...

As the title states, what is the best book? The book I'm using now is Vollhardt and Schore. I don't like it very much. The book is very spammy, if you know what I mean. I'd like a book that builds on previous facts. My current book just presents facts with little relation to previous topics...

Hi all, I have a question regarding the nomenclature of organic compounds. What is the significance of -5-yl in bicyclo[2,1,0]pent-5-ylbicyclo[3,3,0]octane ? In general, what is the significance of the # in -#-yl in compounds? Additionally, in (E)-1,2-diiodo-1methylcyclohexane, does the E...

I'm really interested in how psychedelics and their alkaloids do what they do. I'd really like to get a graduate degree in organic chemistry with a focus on alkaloids or a subdivision thereof. But, I'm worried about how I'd make a living by studying things or things similar to things that are...

Homework Statement 8) How might you prepare each of the following molecules using a nucleophilic substitution at some step? a) (CH3)3-O-CH3 b)CH3CH2CH2CH2CN Homework Equations none The Attempt at a Solution I'm really not sure what's being asked. I'm going to assume that I...

Draw Newman projections depicting the (R)-enantiomer of each of the following: a) 1-bromo-1-chloroethane b) 1-bromo-1-methoxypropane Now, I am SURE that I am mistaken, but isn't that an (S)-enantiomer for each? Assigning priorities: For a) Br > Cl > CH3 > H...right? So, wouldn't the...

This is a tough one! Shown is the biosynthetic cyclization of oxidosqualene catalyzed by oxidosqualene cyclase (OSC) leading to lanosterol as the final product. The reaction starts with a protononation step as shown. Indicate the flow of electrons after the initial protonation step...

Organic: Alkene to Alkyne I am trying to do a synthesis of 2-Octyne from 1-heptene. Conversion of the triple bond to a double bond is pretty easy, but i also have to add an alkyl group, and the double bond must remain on the original triple bond location. Thus, so far thoughts: 1. remove...

" Write an alternate reaction that can be used to prepare the same product that we got in our lab ( changing the metal in the alkoxide or halide leaving group is not sufficient.) Explain the reaction you used, is it expected to be cheaper cost wise, and or produce a higher yield, based on the...

I'm taking orgo 1 this semester, and we just had our first test. I know that's supposed to be the "easiest" test, but let's just say I was pretty lost. I haven't put in much effort so far in chem, and I know I have to get on track now. Is it too late for me to redeem myself? Like do I still...

I am currently learning about stereochemistry in my O-chem class. I just have a few questions that I were running through my head. I know there are a lot of questions here, but they're not HW-related at all; my prof. just taught the lecture and I have had these questions on my mind. 1. How...

Homework Statement Histidine is an amino acid. It is not soluble in water but it will dissolve in water when dilute sodium hydroxide is added. The question has two parts to it: part-a) Write an equation for the reaction that occurs between histidine and dilute sodium hydroxide...

Is there any particular reason other than "law of nature" for us to consume organic compounds which are high energy compounds. Are inorganic compounds not so energy rich like organic compounds? What are the reasons? I couldn't really figure out where to post this question, in bio or chem.

So my mother buried her cat 5 years ago this month. I remember I wasn't home back then and it was a hard time. Yesterday we were talking about this and she asked me if I think the body is completely gone, and I said of course until she mentioned she put the cat in a plastic bag before buring it...

Homework Statement Im having some problems with some oxidation and reduction mechanisms. I am not sure if I am doing them correctly. Homework Equations 1. O=C=O + CH3-MG++I- 2. Acetone + NH4+, Na+ H3BCN The Attempt at a Solution 1. I break one of the bonds from the oxygen...

What do the indices 6 and 13 stand for in 6,13-pentacenequinone? I know that is related to the position of the substituents in the molecule, but I cannot figure out how to interpret it. Can some one point me to a reference where the basics the nomenclature are explained? Thanks,

Homework Statement Why is petrol suitable to be used as a fuel whereas lubricating oil is more suited to lubricate machine joints? Homework Equations The Attempt at a Solution Petrol has a low boiling point. It combusts more easily to provide energy to the car. However...

Help with Organic Rankine Cycle Project please! Moderator's note: this thread is from May 2011 Hi there everyone, I'm posting here in the hope that someone will be willing to help an engineering layman do some calculations, I'm a plumber not an engineer. Thanks to anyone who decides to help...

Homework Statement I'm trying to figure out the mechanism for a reaction catalyzed by MacMillan Generation 1 and 2 organocatalysts. Not going so well. I don't understand what role the organocatalyst plays in the reaction. I read a paper about MacMillan and I think it was saying that the...

Homework Statement Name the following Compound Homework Equations I attached an image of the compound The Attempt at a Solution This is my attempt, although I don't know if it's correct or not, because I don't have an answer key. 2,3-chloro-methyl-4-bromo pentene but...

For Calculus, there is Spivsk. For Physics, there is Kleppner and Morin. For General Chemistry, there is Pauling. All of these books are introductory, and focus on hardcore conceptual understanding. They are widely received as the most rigorous and best way to learn these subjects. Now...