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A robust medium‐scale (approximately 3 g) synthetic method for 15N labeling of pyridine (15N‐Py) is reported based on the Zincke reaction. 15N enrichment in excess of 81% was achieved with approximately 33% yield. 15N‐Py serves as a standard substrate in a wide range of studies employing a hyperpolarization technique for efficient polarization transfer from parahydrogen to heteronuclei; this technique,...
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