Process for the preparation of 1-carbamoyl-3-methylpyrazole

• Main Authors: THIEME, HERMANN., DDR 4600 WITTENBERG, DD, KANDZORRA, ELMAR, SCHUNK, WOLFGANG., DDR 4600 WITTENBERG, DD, HOHN, RICHARD, DDR 4600 WITTENBERG, DD, JOEDICKE, REINHARD, ELBE, WERNER, DDR 4604 KEMBERG, DD, MEYER, WALTRAUD, DDR 4522 COSWIG, DD, WINTERGERST, PETRA, DDR 4601 APOLLENSDORF, DD
• Format: Patent
• Language: English; German
• Published: 16.03.1989
• Subjects: CHEMISTRY; HETEROCYCLIC COMPOUNDS; METALLURGY; ORGANIC CHEMISTRY

The invention relates to a process for the preparation of 1-carbamoyl-3-methylpyrazole (CMP) from the reactants 3(5)-methylpyrazole (MP) and alkali metal cyanate in the presence of acid. CMP is an effective agent for inhibiting the nitrification of ammonium nitrogen in cultivated soils. The reaction...