![\"Coupling](\"https://chem.libretexts.org/@api/deki/files/5195/image080.png\")
\nWhat is the coupling type (e.g., 2JHC, etc.)?
", "messages": [ { "id": "539322", "postDate": "05/29/2019 22:37:10", "content": "What is the coupling type (e.g., 2JHC, etc.)?
", "rawMarkdown": "What is the coupling type (e.g., 2JHC, etc.)?", "votes": null }, { "id": "539451", "postDate": "05/30/2019 03:53:37", "content": "There are 8 types: 3JHC, 2JHC, 1JHC, 3JHH, 2JHH, 3JHN, 2JHN, 1JHN.
\n\nWe can express a coupling type as nJAB. n is the number of bonds in the atomic sequence between A and B atoms.
\n\nHere are some examples:\n\n
(Edit)\n@jzerox2 mentioned the following:\nhttp://sopnmr.ucsd.edu/coupling.htm
", "rawMarkdown": "There are 8 types: 3JHC, 2JHC, 1JHC, 3JHH, 2JHH, 3JHN, 2JHN, 1JHN.\n\nWe can express a coupling type as nJAB. n is the number of bonds in the atomic sequence between A and B atoms. \n\nHere are some examples:\n\n\n\n(Edit)\n@jzerox2 mentioned the following:\nhttp://sopnmr.ucsd.edu/coupling.htm", "votes": null }, { "id": "539456", "postDate": "05/30/2019 04:02:25", "content": "And here I am thinking I would never see this again after orgo.. haha
", "rawMarkdown": "And here I am thinking I would never see this again after orgo.. haha", "votes": null }, { "id": "539604", "postDate": "05/30/2019 09:11:48", "content": "thanks a lot
", "rawMarkdown": "thanks a lot", "votes": null }, { "id": "539898", "postDate": "05/30/2019 17:06:52", "content": "2nd semester organic chemistry was the only college course I ever failed. I did poorly in 1st semester, so had a shaky foundation for 2nd semester. The final, worth 40% of the grade, was the last one of the semester, and I went into it with a massive migraine. I think I got an 18% on the final. LOL.
\n\nThe good news was that I took it over from a new professor who taught via principles rather than memorization, and I got an A- the second time (without too much actual effort).
", "rawMarkdown": "2nd semester organic chemistry was the only college course I ever failed. I did poorly in 1st semester, so had a shaky foundation for 2nd semester. The final, worth 40% of the grade, was the last one of the semester, and I went into it with a massive migraine. I think I got an 18% on the final. LOL.\n\nThe good news was that I took it over from a new professor who taught via *principles* rather than memorization, and I got an A- the second time (without too much actual effort).", "votes": null }, { "id": "557114", "postDate": "06/21/2019 00:49:24", "content": "That was very helpful!
", "rawMarkdown": "That was very helpful!", "votes": null }, { "id": "558576", "postDate": "06/22/2019 15:29:05", "content": "I have a question concerning distance calculations and possible inner rotation in the molecule.
\n\nCan the internal distance of the two H atoms in the first and last examples change because of rotation in the C-C bond?
", "rawMarkdown": "I have a question concerning distance calculations and possible inner rotation in the molecule.\n\nCan the internal distance of the two H atoms in the first and last examples change because of rotation in the C-C bond?", "votes": null }, { "id": "559418", "postDate": "06/24/2019 05:20:42", "content": "http://www.chem.wisc.edu/areas/reich/nmr/notes-5-hmr-5-vic-coupling.pdf
\n\nThis article explains the effect of internal rotations, but doesn't give an answer to your question about distance calculations.
", "rawMarkdown": "http://www.chem.wisc.edu/areas/reich/nmr/notes-5-hmr-5-vic-coupling.pdf\n\nThis article explains the effect of internal rotations, but doesn't give an answer to your question about distance calculations.", "votes": null }, { "id": "559570", "postDate": "06/24/2019 09:41:50", "content": "Thank you. It seems very complicated for a non-chemist :-)
", "rawMarkdown": "Thank you. It seems very complicated for a non-chemist :-)", "votes": null }, { "id": "567978", "postDate": "07/04/2019 08:08:59", "content": "😯 Still confused about which example corresponds to which type.
", "rawMarkdown": "😯 Still confused about which example corresponds to which type.", "votes": null }, { "id": "568001", "postDate": "07/04/2019 08:46:10", "content": "Examples for 2JHH, 3JHH, and 4JHH
", "rawMarkdown": "Examples for 2JHH, 3JHH, and 4JHH", "votes": null }, { "id": "583149", "postDate": "07/24/2019 05:24:33", "content": "You said the distance value will change due to bond. How to find whether carbon- carbon bond is alkene type or alkane type(i.e.. double or single bond)
", "rawMarkdown": "You said the distance value will change due to bond. How to find whether carbon- carbon bond is alkene type or alkane type(i.e.. double or single bond)", "votes": null }, { "id": "586864", "postDate": "07/29/2019 20:07:55", "content": "@saravanansaminathan \nBasic chemistry: Carbon has four bonds, nitrogen three, oxygen two, fluorine and hydrogen one. With these rules, you should be able to draw every molecule by yourself, including bond types.\nThere are also kernels which use OpenBabel or RDKit and these packages can identify bond types for you.
", "rawMarkdown": "saravanansaminathan \nBasic chemistry: Carbon has four bonds, nitrogen three, oxygen two, fluorine and hydrogen one. With these rules, you should be able to draw every molecule by yourself, including bond types.\nThere are also kernels which use OpenBabel or RDKit and these packages can identify bond types for you.", "votes": null } ], "comments": [ { "id": 539451, "author_name": "tonyyy", "author_url": "", "post_date": "05/30/2019 03:53:37", "content": "There are 8 types: 3JHC, 2JHC, 1JHC, 3JHH, 2JHH, 3JHN, 2JHN, 1JHN.
\n\nWe can express a coupling type as nJAB. n is the number of bonds in the atomic sequence between A and B atoms.
\n\nHere are some examples:\n\n
(Edit)\n@jzerox2 mentioned the following:\nhttp://sopnmr.ucsd.edu/coupling.htm
", "votes": null, "replies": [ { "id": 539456, "author_name": "matthewmasters", "author_url": "", "post_date": "05/30/2019 04:02:25", "content": "And here I am thinking I would never see this again after orgo.. haha
", "votes": null, "replies": [] }, { "id": 539898, "author_name": "inversion", "author_url": "", "post_date": "05/30/2019 17:06:52", "content": "2nd semester organic chemistry was the only college course I ever failed. I did poorly in 1st semester, so had a shaky foundation for 2nd semester. The final, worth 40% of the grade, was the last one of the semester, and I went into it with a massive migraine. I think I got an 18% on the final. LOL.
\n\nThe good news was that I took it over from a new professor who taught via principles rather than memorization, and I got an A- the second time (without too much actual effort).
", "votes": null, "replies": [] }, { "id": 567978, "author_name": "usherbob", "author_url": "", "post_date": "07/04/2019 08:08:59", "content": "😯 Still confused about which example corresponds to which type.
", "votes": null, "replies": [] }, { "id": 568001, "author_name": "tonyyy", "author_url": "", "post_date": "07/04/2019 08:46:10", "content": "Examples for 2JHH, 3JHH, and 4JHH
", "votes": null, "replies": [] } ] }, { "id": 539604, "author_name": "mutlusimsek", "author_url": "", "post_date": "05/30/2019 09:11:48", "content": "thanks a lot
", "votes": null, "replies": [] }, { "id": 557114, "author_name": "", "author_url": "", "post_date": "06/21/2019 00:49:24", "content": "That was very helpful!
", "votes": null, "replies": [] }, { "id": 558576, "author_name": "petersorensen360", "author_url": "", "post_date": "06/22/2019 15:29:05", "content": "I have a question concerning distance calculations and possible inner rotation in the molecule.
\n\nCan the internal distance of the two H atoms in the first and last examples change because of rotation in the C-C bond?
", "votes": null, "replies": [ { "id": 559418, "author_name": "tonyyy", "author_url": "", "post_date": "06/24/2019 05:20:42", "content": "http://www.chem.wisc.edu/areas/reich/nmr/notes-5-hmr-5-vic-coupling.pdf
\n\nThis article explains the effect of internal rotations, but doesn't give an answer to your question about distance calculations.
", "votes": null, "replies": [] }, { "id": 559570, "author_name": "petersorensen360", "author_url": "", "post_date": "06/24/2019 09:41:50", "content": "Thank you. It seems very complicated for a non-chemist :-)
", "votes": null, "replies": [] }, { "id": 583149, "author_name": "saravanansaminathan", "author_url": "", "post_date": "07/24/2019 05:24:33", "content": "You said the distance value will change due to bond. How to find whether carbon- carbon bond is alkene type or alkane type(i.e.. double or single bond)
", "votes": null, "replies": [] }, { "id": 586864, "author_name": "somnambwl", "author_url": "", "post_date": "07/29/2019 20:07:55", "content": "@saravanansaminathan \nBasic chemistry: Carbon has four bonds, nitrogen three, oxygen two, fluorine and hydrogen one. With these rules, you should be able to draw every molecule by yourself, including bond types.\nThere are also kernels which use OpenBabel or RDKit and these packages can identify bond types for you.
", "votes": null, "replies": [] } ] } ], "raw_markdown_by_id": { "539322": "What is the coupling type (e.g., 2JHC, etc.)?", "539451": "There are 8 types: 3JHC, 2JHC, 1JHC, 3JHH, 2JHH, 3JHN, 2JHN, 1JHN.\n\nWe can express a coupling type as nJAB. n is the number of bonds in the atomic sequence between A and B atoms. \n\nHere are some examples:\n\n\n\n(Edit)\n@jzerox2 mentioned the following:\nhttp://sopnmr.ucsd.edu/coupling.htm", "539456": "And here I am thinking I would never see this again after orgo.. haha", "539604": "thanks a lot", "539898": "2nd semester organic chemistry was the only college course I ever failed. I did poorly in 1st semester, so had a shaky foundation for 2nd semester. The final, worth 40% of the grade, was the last one of the semester, and I went into it with a massive migraine. I think I got an 18% on the final. LOL.\n\nThe good news was that I took it over from a new professor who taught via *principles* rather than memorization, and I got an A- the second time (without too much actual effort).", "557114": "That was very helpful!", "558576": "I have a question concerning distance calculations and possible inner rotation in the molecule.\n\nCan the internal distance of the two H atoms in the first and last examples change because of rotation in the C-C bond?", "559418": "http://www.chem.wisc.edu/areas/reich/nmr/notes-5-hmr-5-vic-coupling.pdf\n\nThis article explains the effect of internal rotations, but doesn't give an answer to your question about distance calculations.", "559570": "Thank you. It seems very complicated for a non-chemist :-)", "567978": "😯 Still confused about which example corresponds to which type.", "568001": "Examples for 2JHH, 3JHH, and 4JHH", "583149": "You said the distance value will change due to bond. How to find whether carbon- carbon bond is alkene type or alkane type(i.e.. double or single bond)", "586864": "saravanansaminathan \nBasic chemistry: Carbon has four bonds, nitrogen three, oxygen two, fluorine and hydrogen one. With these rules, you should be able to draw every molecule by yourself, including bond types.\nThere are also kernels which use OpenBabel or RDKit and these packages can identify bond types for you." }, "source": "meta" }