The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. 455-24-3, Name is 4-(Trifluoromethyl)benzoic acid, SMILES is C1=C(C=CC(=C1)C(O)=O)C(F)(F)F, in an article , author is Roy, Soumya S., once mentioned of 455-24-3, Product Details of 455-24-3.
A Simple Route to Strong Carbon-13 NMR Signals Detectable for Several Minutes
Nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) suffer from low sensitivity and limited nuclear spin memory lifetimes. Although hyperpolarization techniques increase sensitivity, there is also a desire to increase relaxation times to expand the range of applications addressable by these methods. Here, we demonstrate a route to create hyperpolarized magnetization in C-13 nuclear spin pairs that last much longer than normal lifetimes by storage in a singlet state. By combining molecular design and low-field storage with para-hydrogen derived hyperpolarization, we achieve more than three orders of signal amplification relative to equilibrium Zeeman polarization and an order of magnitude extension in state lifetime. These studies use a range of specifically synthesized pyridazine derivatives and dimethyl p-tolyl phenyl pyridazine is the most successful, achieving a lifetime of about 190 s in low-field, which leads to a C-13-signal that is visible for 10 minutes.
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Reference:
Pyridazine – Wikipedia,
,Pyridazine | C4H4N2 – PubChem