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Merck

56750

Sigma-Aldrich

咪唑

Imidazole
1 of 1 reviewers received a sample product or took part in a promotion

puriss. p.a., ≥99.5% (GC)

别名:

1,3-二氮杂-2,4-环戊二烯, 甘恶啉

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About This Item

经验公式(希尔记法):
C3H4N2
CAS号:
分子量:
68.08
Beilstein:
103853
EC 号:
MDL编号:
UNSPSC代码:
12352005
eCl@ss:
39161001
PubChem化学物质编号:
NACRES:
NA.21
价格与库存信息目前不能提供

蒸汽压

<1 mmHg ( 20 °C)

质量水平

等级

puriss. p.a.

方案

≥99.5% (GC)

表单

flakes
powder or crystals

灼烧残渣 (900 °C)

≤0.1%

pH值(酸碱度)

9.5-11.0 (25 °C, 50 mg/mL in H2O)

pKa (25 °C)

6.95

沸点

256 °C (lit.)

mp

88-91 °C (lit.)
88-91 °C

溶解性

alcohol: soluble(lit.)
chloroform: soluble(lit.)
pyridine: soluble(lit.)
water: soluble(lit.)

痕量阴离子

chloride (Cl-): ≤50 mg/kg
sulfate (SO42-): ≤50 mg/kg

痕量阳离子

Ca: ≤10 mg/kg
Cd: ≤5 mg/kg
Co: ≤5 mg/kg
Cr: ≤5 mg/kg
Cu: ≤5 mg/kg
Fe: ≤5 mg/kg
K: ≤50 mg/kg
Mg: ≤5 mg/kg
Mn: ≤5 mg/kg
Na: ≤50 mg/kg
Ni: ≤5 mg/kg
Pb: ≤5 mg/kg
Zn: ≤5 mg/kg

SMILES字符串

c1c[nH]cn1

InChI

1S/C3H4N2/c1-2-5-3-4-1/h1-3H,(H,4,5)

InChI key

RAXXELZNTBOGNW-UHFFFAOYSA-N

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一般描述

咪唑是一种具有五元平面环的芳香杂环化合物。它是一种两性化合物,因为同时存在酸性 NH 和碱性氮原子。咪唑是许多重要分子的重要成分,包括天然产物、生物活性分子、离子液体和咪唑鎓。可用作各种药物制备的合成砌块。[1][2]

应用

咪唑可以用作催化剂:      
  • 用于在 DMF 中甲硅烷基氯化物存在下,醇、羧酸和胺的甲硅烷基化。     
  • 在肽偶联中使用亚磷酸三苯酯。
  • 由相应的羧酸和光气制备酰氯。

它也可以用于以下反应:      
  • 咪唑-PPh3/I2 催化体系用于醇转化为碘化物
  • 咪唑-PPh3/I2 用于二醇脱氧反应。

特别适用于 pH 6.2-7.8 范围内的缓冲液

其他说明

用于滴定天冬氨酸和谷氨酸[3]

警示用语:

Danger

危险声明

危险分类

Acute Tox. 4 Oral - Eye Dam. 1 - Repr. 1B - Skin Corr. 1C

储存分类代码

6.1C - Combustible acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects

WGK

WGK 2

闪点(°F)

293.0 °F - closed cup

闪点(°C)

145 °C - closed cup

个人防护装备

Eyeshields, Faceshields, Gloves, type P3 (EN 143) respirator cartridges


历史批次信息供参考:

分析证书(COA)

Lot/Batch Number

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Three 3D Coordination Polymers Constructed by Cd (II) and Zn (II) with Imidazole-4, 5-Dicarboxylate and 4, 4 `-Bipyridyl Building Blocks
WG Lu, et al.
Crystal Growth & Design, 6, 564-571 (2006)
Eagleson M.
Concise Encyclopedia Chemistry, 523-524 (1994)
Novel palladium imidazole catalysts for Suzuki cross-coupling reactions
CJ Mathews, et al.
Journal of Molecular Catalysis. B, Enzymatic, 206, 77-82 (2003)
Z. Anal. Chem., 261, 38-38 (1972)
Peter Canning et al.
Journal of molecular biology, 426(13), 2457-2470 (2014-04-29)
The discoidin domain receptors (DDRs), DDR1 and DDR2, form a unique subfamily of receptor tyrosine kinases that are activated by the binding of triple-helical collagen. Excessive signaling by DDR1 and DDR2 has been linked to the progression of various human

Questions

1–2 of 2 Questions  
  1. How can I determine the shelf life / expiration / retest date of this product?

    1 answer
    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf

      Helpful?

  2. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer
    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

      Helpful?

Reviews

1 of 1 reviewers received a sample product or took part in a promotion

Active Filters

  1. Netherlands
    • Reviews 2
    • Votes 6
    4 out of 5 stars.

    Abs at 280, otherwise great

    Good imidazole. Does have absorbance at 280nm, am still looking for better quality in that area

    Helpful?

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