guanidine

그림문자(GHS)

• 그림문자(GHS)

  

• 신호 어

  Warning

• 유해·위험 문구

  H319：눈에 심한 자극을 일으킴

  H410：장기적 영향에 의해 수생생물에 매우 유독함

• 예방조치문구

  P264：취급 후에는 손을 철저히 씻으시오.

  P264：취급 후에는 손을 철저히 씻으시오.

  P273：환경으로 배출하지 마시오.

  P280：보호장갑/보호의/보안경/안면보호구를 착용하시오.

  P337+P313：눈에 대한 자극이 지속되면 의학적인 조치· 조언를 구하시오.

  P391：누출물을 모으시오.

  P501：...에 내용물 / 용기를 폐기 하시오.

guanidine 화학적 특성, 용도, 생산

• 화학적 성질

  Colorless crystals. Soluble inwater and alcohol. Combustible. Guanidine is a strong monobasic Bronsted base, which absorbs water and carbon dioxide from the air and forms strongly alkaline solutions with water and alcohols; the pH of a 20 wt % aqueous solution is ca. 13.5 (25 ℃). In aqueous solution at elevated temperature guanidine is hydrolyzed to urea; airtight alcohol solutions are stable. Guanidine is infinitely soluble in water, ethanol, methanol, and dimethylformamide.

• 용도

  Guanidine is an intermediate in synthesizing N-Formylguanidine (F700505), which is used in the preparation of Amiloride (A578700), a sodium channel blocker used as a diuretic drug.

• 생산 방법

  Guanidine is formed (1) by heating ammonium thiocyanate to 180 °C, (2) by ammonolysis of orthocarbonates, C(OC2H5)4 + 3NH3 → (NH2)2C=NH + 4C2H5OH, (3) by ammonolysis of chloropicrin, Cl3CNO2 + 7NH3 → NH2)2 C=NH + 3NH4Cl + N2 + 3H2O, (4) by ammonolysis of cyanogen chloride, ClCN + NH3 → ClC(NH2)=NH → HN=C=NH → (NH2)2 C=NH.
  Guanidine forms salts with acids, e.g., guanidine nitrate, HNC(NH2)2 · HNO3. By heating at 120 °C for several hours, a mixture of ammonium thiocyanate and dicyanodiamide, guanidine thiocyanate solution is obtained by extracting with water. Treating guanidine with a mixture of nitric and sulfuric acids forms nitroguanidine which is reduced by zinc and acetic acid to aminoguanidine.
  By treating aminoguanidine (1) with dilute acid or alkali, there is obtained, first, semicarbazide, finally hydrazine; (2) with nitrous acid, diazoguanidine which is decomposed by alkali into alkali azide (e.g., NaN3) plus cyanamide (H2N·CN) plus water.

• 농업용

  Carbamidine is another name for guanidine. It is a crystalline basic compound related to urea. It forms a number of salts which are used as fertilizers. Guanidine phosphate is an example.

• Purification Methods

  Crystallise it from water/EtOH under nitrogen. It is very deliquescent and absorbs CO2 from the air readily. [Jones Trans Faraday Soc 55 524 1959, Beilstein 3 H 82, 3 I 39, 3 II 69, 3 III 154, 3 IV 148.]

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