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  2. Proton nuclear magnetic resonance - Wikipedia

    en.wikipedia.org/wiki/Proton_nuclear_magnetic...

    Proton nuclear magnetic resonance (proton NMR, hydrogen-1 NMR, or 1 H NMR) is the application of nuclear magnetic resonance in NMR spectroscopy with respect to hydrogen-1 nuclei within the molecules of a substance, in order to determine the structure of its molecules. [1]

  3. Magnetic inequivalence - Wikipedia

    en.wikipedia.org/wiki/Magnetic_inequivalence

    For instance, magnetic inequivalence is found in 1,4-homodisubstituted butadienes. [2] It might be expected in a molecule such as a symmetrical 2,3,4,5-tetrasubstituted pyrrolidine , but less rigid and less flat sp 3 frameworks tend to show very weak long-range couplings (through 4 or more bonds) so as to not manifest much sign of magnetic ...

  4. Hexamethylbenzene - Wikipedia

    en.wikipedia.org/wiki/Hexamethylbenzene

    Hexamethylbenzene, also known as mellitene, is a hydrocarbon with the molecular formula C 12 H 18 and the condensed structural formula C 6 (CH 3) 6.It is an aromatic compound and a derivative of benzene, where benzene's six hydrogen atoms have each been replaced by a methyl group.

  5. Nuclear magnetic resonance spectroscopy - Wikipedia

    en.wikipedia.org/wiki/Nuclear_magnetic_resonance...

    A 900 MHz NMR instrument with a 21.1 T magnet at HWB-NMR, Birmingham, UK Nuclear magnetic resonance spectroscopy, most commonly known as NMR spectroscopy or magnetic resonance spectroscopy (MRS), is a spectroscopic technique based on re-orientation of atomic nuclei with non-zero nuclear spins in an external magnetic field.

  6. Mesitylene - Wikipedia

    en.wikipedia.org/wiki/Mesitylene

    Mesitylene or 1,3,5-trimethylbenzene is a derivative of benzene with three methyl substituents positioned symmetrically around the ring. The other two isomeric trimethylbenzenes are 1,2,4-trimethylbenzene (pseudocumene) and 1,2,3-trimethylbenzene (hemimellitene).

  7. Costco membership growth 'robust,' even amid fee increase ...

    www.aol.com/costco-membership-growth-robust-even...

    More shoppers came to Costco stores in the three months ending Nov. 24, just days ahead of Black Friday. The company saw sales up 7.5% over last year.

  8. This Nighttime Habit Could Be A Key Indicator Of Dementia ...

    www.aol.com/nighttime-habit-could-key-indicator...

    This isn’t the first time that better sleep has been linked with a lower risk of dementia: A study published in October even found that people with sleep apnea are more likely to develop dementia.

  9. The Navy knows thousands may have been exposed to cancer ...

    www.aol.com/news/shipyard-veterans-may-exposed...

    It poisoned the groundwater with high levels of dichloroethene, trichloroethylene, vinyl chloride and benzene, a Navy report released in 2000 said.The colorless chemicals can cause several ...