Syntheses with stable isotopes: Urea‐13C, urea‐12C, and urea‐13C‐15N2

Abstract
Urea has been prepared from the reaction of carbon monoxide and ammonia in the presence of sulfur. The reaction has been applied to the synthesis of urea‐13C, urea‐12C, and urea‐13C‐15N2.

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