The application describes an MRD-based reactor. The reactor is characterized by a continuous wall portion, and is in connection with a MRD, adapted for performing localized NMR spectroscopy of the medium inside the reactor. MRD-based reactors, in which the MRD is at least partially inside the reactor or reaction media, and those in which the MRD accommodates the reactor, are also introduced. Lastly, the invention teaches an in situ method for controlling and analyzing of a reaction. The method makes use of an MRD-based reactor; and comprises applying a magnetic field within the reactor, especially for performing a plurality of localized spectroscopic measurements and either real time or offline analyzing and/or controlling of reactions in the flowing media.
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