ChemicalBook CAS DataBase List 4-Methoxyphenylhydrazine hydrochloride

4-Methoxyphenylhydrazine hydrochloride synthesis

8synthesis methods

Product Name:4-Methoxyphenylhydrazine hydrochloride
CAS Number:19501-58-7
Molecular formula:C7H11ClN2O
Molecular Weight:174.63

4-Methoxyphenylhydrazine hydrochloride Preparation Process: Take hydrochloric acid and sodium nitrite and add them sequentially to aniline, where the molar ratio of aniline to hydrochloric acid to sodium nitrite is 1:2.3 to 3.2:1 to 1.1, and sodium nitrite is added at 0 to 5°C. The reaction temperature is 0 to 22°C, and the reaction time is 30 to 90 minutes. Then add ammonium sulfite and hydrochloric acid according to a molar ratio to aniline of 1:2 to 3.5:2.5 to 3.0. After reduction, hydrolysis, and acidification, the product can be obtained by filtration or centrifugation.

104-94-9 Synthesis

104-94-9
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$9.00/1g

19501-58-7
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$7.00/250mg

Yield:19501-58-7 77%

Reaction Conditions:

Stage #1: 4-methoxy-anilinewith hydrogenchloride;sodium nitrite in water; for 1.75 h;Cooling;
Stage #2: with hydrogenchloride;tin(ll) chloride in water at 0; for 0.5 h;

Steps:

(4-Methoxyphenyl)hydrazine (4)

To asolution of p-anisidine (4.93 g, 40mmol) in water (12 mL) and conc. HCl (12 mL) was added a solution of sodiumnitrite (3.3 g, 46.40 mmol) in water (10 mL) dropwise at -5 ^oC overthe period of 15 min. The reaction mixture was stirred for 1.5 h and a solutionof SnCl₂ (16.00 g, 84.40 mmol) in conc. HCl (25 mL) was addeddropwise and stirred manually in spite of bulky precipitation. After thereaction mixture was stirred at 0 ^oC for 30 min, the precipitate wascollected by filtration, washed with water (20 mL), ethanol (12 mL), and Et₂O(50 mL) and dried in vacuo to give compound 4 (5.40 g, 31.00 mmol, 77%) as a pink solid: R_f =0.23 (n-hexane : EtOAc = 2:1); ¹H NMR (400MHz, D₂O) δ6.94 (2H, d, J = 8.8 Hz), 6.84 (2H, d, J = 8.8Hz), 3.64 (3H, s).

References:

Gim, Hyo Jin;Li, Hua;Jeong, Ji Hye;Lee, Su Jeong;Sung, Mi-Kyung;Song, Mi-Young;Park, Byung-Hyun;Oh, Soo Jin;Ryu, Jae-Ha;Jeon, Raok [Bioorganic and Medicinal Chemistry,2015,vol. 23,# 13,art. no. 12258,p. 3322 - 3336] Location in patent:supporting information