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# Lecture 12. Coupling Analysis in First-Order and Near-First-Order Systems

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#### Automatisierte Medienanalyse

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I want to spend the next 3 lectures 3 classes talking really closely about first-order coupling and the reason is that there is so much to be gained by deeply understanding In a more respect as I said
In the 4th quarter so the
JOB it's going to be 1 minus 3 and to minus 4 they will within the limits of experimental error the the saying NJ being here will be the same within the limits of experimental error it would be 1 prime -minus 3 prime In 2 primary minus 4 per the in this case since it's an X pattern the coupling with the other protons so the coupling with the remote partner will call it a tax J A X equals 1 minus 2 In 3 miners working again those will be the same within experimental error so let's say for a moment this is 14 hurt that's also 14 hurt let's say for a moment that this is 6 hurts actually looks the Web drawn it it looks more like about 900 so let's say this is 9 hurts that's going to be about knowing that's going to be annoying hurts when limits of experimental error here this distance will also be 14 hurts as well lacked distance this distance who have drawn it looks like it's about 12 heard that looks like spam UK where 1 not under 1 minus 2 will not be equal to 2 minus and so on ,comma here J B X equals 1 1 prime minus 2 prime In 3 prime -minus 4 prior to any of you look at this pattern in you draws splitting a splitting tree diagrams we into a double sets are being changed and in each of those lines is further wet With a small so you get this pattern of lying line lying lying if I call my lines 1 2 3 In 4 1 minus 2 is the small J 3 minus for the small J 1 minus 3 as the big J 2 miners forced From the AB coupling the Germinal coupling in this particular case and the court source of the small is from the coupling to in this case this nucleus over here that's going beautiful question that's going to depend on the geometrical relationships on the cop was curve so typical EU you will not have exactly the same coupling between 1 of the 2 protons let's say the pro-West and this protons versus the other predators in this part of town and so rather than might let me put up some real data you'll see exactly the same thing but at least will be it'll be a nice nice chance for you to have a real spectrum and I know I passed this out before but we didn't work as deeply at the spectrum now let's look at it with a fresh pair of eyes let's look at it more deep voice so I didn't use this exact compound I just grabbed this right off of the old rich web page and remember you can go to SIA l . com www SIA AOL L . com to get yourself lots of suspect it's a great way to to check out your ideas and your understanding of things In so here we see a real compound I've shown you this before this is phenylalanine indeed to so unlike the example that I the hypothetical example I gave in chloroform this 1 doesn't have an here it has a meaning here and it has a carboxyl like said indeed to all those exchange and so this becomes in d to win you essentially see no coupling and don't see it and actually there's DC here so this really becomes indeed 3 plus and you don't see falling and this becomes date so this system here what remains of the 2 methylene Stanimir following so this isn't ABX
right over here typically aren't you still coupling across there coupling on pure Indians is going to come up on the homework and already I think why the fantasy that very soon now all of this is given in more detail in practice approach has wonderful examples for period means for fire fiends for all these types of systems offer real compounds and offers typical examples but here distilled into 2 really wonderful what appendix and really 1 page of the appendix is so much of a difference good stuff that's going to help you you out with some the problems that you were so can't think this is where I'd like to wrap it up today we're going to talk more about first-order splitting next time and we're going to walk through some examples of goblets of doublets
and triplets of doublets and doublets and triplets and upwards of doublets and prepare you for the work of the book assignment that comes later on
Chemische Forschung
Organische Verbindungen
Wasserstand
Stoffwechselweg
Feuer
Komplexbildungsreaktion
Setzen <Verfahrenstechnik>
Wasser
Computeranimation
Satelliten-DNS
Azokupplung
Protonierung
Verzerrung
Chemische Struktur
Chemische Verschiebung
Benzolring
Vorlesung/Konferenz
Operon
Abschrecken
Systemische Therapie <Pharmakologie>
Stereoselektivität
Emissionsspektrum
Kohlenstofffaser
Chloroform
Wasser
Alphaspektroskopie
Stickstoff
Massenspektrometrie
Lösung
Chemische Verbindungen
Wasserfall
Chemische Verschiebung
Zündholz
Methylgruppe
Vorlesung/Konferenz
Delta
Funktionelle Gruppe
Beta-Faltblatt
Wirbelstromverfahren
Deuterium
Systemische Therapie <Pharmakologie>
Substituent
Butter
Fettsäuremethylester
Hydrierung
Elektron <Legierung>
Wasserstand
Reaktionsführung
Setzen <Verfahrenstechnik>
Tellerseparator
Primärer Sektor
Isotropie
Azokupplung
Protonierung
Verzerrung
Nucleolus
Körpergewicht
Phenylalanin
Singulettzustand
Röntgenspektrometer
Mineralbildung
Single electron transfer
Zellkern
Emissionsspektrum
Quellgebiet
Chloroform
Chemische Verbindungen
Azokupplung
Protonierung
Keimzentrum
Bukett <Wein>
Systemische Therapie <Pharmakologie>
Chemischer Prozess
Carboxylierung
Stimmbruch
Emissionsspektrum
Kohlenstofffaser
Ammoniumverbindungen
Wasser
Alphaspektroskopie
Stickstoff
Doppelbindung
Chemische Bindung
Elektronegativität
Alkoholgehalt
Vorlesung/Konferenz
Wasserwelle
Hybridisierung <Chemie>
Deuterium
Krankengeschichte
Sonnenschutzmittel
Hydrierung
Elektron <Legierung>
Setzen <Verfahrenstechnik>
Quellgebiet
Phthise
Azokupplung
Protonierung
Nucleolus
Phenol
Blei-208
Phenylalanin
Benzolring
Sauerstoffverbindungen
Zelle
Hydrierung
Fülle <Speise>
Kohlenstofffaser
Setzen <Verfahrenstechnik>
Doppelbindung
Azokupplung
Keimzentrum
Chemische Bindung
Elektronegativität
Vorlesung/Konferenz
Gletscherzunge
Molekül
Funktionelle Gruppe
Systemische Therapie <Pharmakologie>
Substituent
Hydroxybuttersäure <gamma->
Azokupplung
Fülle <Speise>
Feuer
Setzen <Verfahrenstechnik>
Polyfluorethylenpropylene
Systemische Therapie <Pharmakologie>
Chemische Verbindungen
Periodate