BioNMR
NMR aggregator & online community since 2003
BioNMR    
Learn or help to learn NMR - get free NMR books!
 

Go Back   BioNMR > Educational resources > NMR Questions and Answers
Advanced Search
Home Forums Wiki NMR feeds Downloads Register Today's Posts



Jobs Groups Conferences Literature Pulse sequences Software forums Programs Sample preps Web resources BioNMR issues


Webservers
NMR processing:
MDD
NMR assignment:
Backbone:
Autoassign
MARS
UNIO Match
PINE
Side-chains:
UNIO ATNOS-Ascan
NOEs:
UNIO ATNOS-Candid
UNIO Candid
ASDP
Structure from NMR restraints:
Ab initio:
GeNMR
Cyana
XPLOR-NIH
ASDP
UNIO ATNOS-Candid
UNIO Candid
Fragment-based:
BMRB CS-Rosetta
Rosetta-NMR (Robetta)
Template-based:
GeNMR
I-TASSER
Refinement:
Amber
Structure from chemical shifts:
Fragment-based:
WeNMR CS-Rosetta
BMRB CS-Rosetta
Homology-based:
CS23D
Simshift
Torsion angles from chemical shifts:
Preditor
TALOS
Promega- Proline
Secondary structure from chemical shifts:
CSI (via RCI server)
TALOS
MICS caps, β-turns
d2D
PECAN
Flexibility from chemical shifts:
RCI
Interactions from chemical shifts:
HADDOCK
Chemical shifts re-referencing:
Shiftcor
UNIO Shiftinspector
LACS
CheckShift
RefDB
NMR model quality:
NOEs, other restraints:
PROSESS
PSVS
RPF scores
iCing
Chemical shifts:
PROSESS
CheShift2
Vasco
iCing
RDCs:
DC
Anisofit
Pseudocontact shifts:
Anisofit
Protein geomtery:
Resolution-by-Proxy
PROSESS
What-If
iCing
PSVS
MolProbity
SAVES2 or SAVES4
Vadar
Prosa
ProQ
MetaMQAPII
PSQS
Eval123D
STAN
Ramachandran Plot
Rampage
ERRAT
Verify_3D
Harmony
Quality Control Check
NMR spectrum prediction:
FANDAS
MestReS
V-NMR
Flexibility from structure:
Backbone S2
Methyl S2
B-factor
Molecular dynamics:
Gromacs
Amber
Antechamber
Chemical shifts prediction:
From structure:
Shiftx2
Sparta+
Camshift
CH3shift- Methyl
ArShift- Aromatic
ShiftS
Proshift
PPM
CheShift-2- Cα
From sequence:
Shifty
Camcoil
Poulsen_rc_CS
Disordered proteins:
MAXOCC
Format conversion & validation:
CCPN
From NMR-STAR 3.1
Validate NMR-STAR 3.1
NMR sample preparation:
Protein disorder:
DisMeta
Protein solubility:
camLILA
ccSOL
Camfold
camGroEL
Zyggregator
Isotope labeling:
UPLABEL
Solid-state NMR:
sedNMR


Reply
Thread Tools Search this Thread Rate Thread Display Modes
  #1  
Unread 01-01-2003, 05:34 PM
Junior Member
 
Join Date: Jan 2003
Posts: 1
Points: 12, Level: 1
Points: 12, Level: 1 Points: 12, Level: 1 Points: 12, Level: 1
Level up: 23%, 38 Points needed
Level up: 23% Level up: 23% Level up: 23%
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
NMR Credits: 0
NMR Points: 12
Downloads: 0
Uploads: 0
Default Answered: Where do ketones and carboxylic acids show up on a proton NMR?

Where do ketones and carboxylic acids show up on a proton NMR?
Reply With Quote


Did you find this post helpful? Yes | No
Best Answer - Posted by Cubbi
Ketones in general don't have to show up on a proton NMR since ketone is defined as R-CO-R', no protons necessary. But in practice, there's usually the alpha proton on the next carbon: RR'CH-CO-R", and that proton shows up about 2 - 2.5 ppm (2.1 ppm for acetone, 2.4 ppm diethylketone, 2.6 ppm acetophenone).With carboxylic acids, you have the acidic hydrogen in the -COOH group which shows up way on the left, 10-15 ppm, and is often exchanged with the solvent (so it may be a very wide low signal, or disappear completely if your solvent is/contains D2O)Notice also that a typical carboxylic acid has the alpha-carbon, RR'CH-CO(OH) which has a hydrogen, and is attached to -CO- just like a ketone. That hydrogen also shows up in 2 - 2.5 ppm region (2.1 for acetic acid, 2.3 for valeric acid, etc)
Content provided by Yahoo Answers.

  #2  
Unread 01-01-2003, 05:34 PM
Junior Member
 
Join Date: Jan 2003
Posts: 1
Points: 2, Level: 1
Points: 2, Level: 1 Points: 2, Level: 1 Points: 2, Level: 1
Level up: 3%, 48 Points needed
Level up: 3% Level up: 3% Level up: 3%
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
NMR Credits: 0
NMR Points: 2
Downloads: 0
Uploads: 0
Provided Answers: 1
Default Where do ketones and carboxylic acids show up on a proton NMR?

Ketones in general don't have to show up on a proton NMR since ketone is defined as R-CO-R', no protons necessary. But in practice, there's usually the alpha proton on the next carbon: RR'CH-CO-R", and that proton shows up about 2 - 2.5 ppm (2.1 ppm for acetone, 2.4 ppm diethylketone, 2.6 ppm acetophenone).With carboxylic acids, you have the acidic hydrogen in the -COOH group which shows up way on the left, 10-15 ppm, and is often exchanged with the solvent (so it may be a very wide low signal, or disappear completely if your solvent is/contains D2O)Notice also that a typical carboxylic acid has the alpha-carbon, RR'CH-CO(OH) which has a hydrogen, and is attached to -CO- just like a ketone. That hydrogen also shows up in 2 - 2.5 ppm region (2.1 for acetic acid, 2.3 for valeric acid, etc)
Content provided by Yahoo Answers.
Reply With Quote


1 out of 1 members found this post helpful. Did you find this post helpful? Yes | No
Reply
Similar Threads
Thread Thread Starter Forum Replies Last Post
Metabolic profiles show specific mitochondrial toxicities in vitro in myotube cells
Metabolic profiles show specific mitochondrial toxicities in vitro in myotube cells Abstract Mitochondrial toxicity has been a serious concern, not only in preclinical drug development but also in clinical trials. In mitochondria, there are several distinct metabolic processes including fatty acid β-oxidation, the tricarboxylic acid (TCA) cycle, and oxidative phosphorylation (OXPHOS), and each process contains discrete but often intimately linked steps. Interruption in any one of those steps can cause mitochondrial dysfunction. Detection of inhibition to OXPHOS can be complicated in...
nmrlearner Journal club 0 03-03-2011 02:06 AM
[NMR paper] Synthesis of 5-methylaminomethyl-2-selenouridine in tRNAs: 31P NMR studies show the l
Synthesis of 5-methylaminomethyl-2-selenouridine in tRNAs: 31P NMR studies show the labile selenium donor synthesized by the selD gene product contains selenium bonded to phosphorus. http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--www.pubmedcentral.nih.gov-corehtml-pmc-pmcgifs-pubmed-pmc.gif Related Articles Synthesis of 5-methylaminomethyl-2-selenouridine in tRNAs: 31P NMR studies show the labile selenium donor synthesized by the selD gene product contains selenium bonded to phosphorus. Proc Natl Acad Sci U S A. 1992 Apr 1;89(7):2975-9 Authors: ...
nmrlearner Journal club 0 08-21-2010 11:41 PM
[NMR paper] Proton NMR assignments of heme contacts and catalytically implicated amino acids in c
Proton NMR assignments of heme contacts and catalytically implicated amino acids in cyanide-ligated cytochrome c peroxidase determined from one- and two-dimensional nuclear Overhauser effects. Related Articles Proton NMR assignments of heme contacts and catalytically implicated amino acids in cyanide-ligated cytochrome c peroxidase determined from one- and two-dimensional nuclear Overhauser effects. Biochemistry. 1991 May 7;30(18):4398-405 Authors: Satterlee JD, Erman JE Proton NMR assignments of the heme pocket and catalytically relevant...
nmrlearner Journal club 0 08-21-2010 11:16 PM



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



BioNMR advertisements to pay for website hosting and domain registration. Nobody does it for us.



Powered by vBulletin® Version 3.7.3
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright, BioNMR.com, 2003-2013
Search Engine Friendly URLs by vBSEO 3.6.0

All times are GMT. The time now is 09:23 AM.


Map