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62-56-6 - Thiourea, 99% - Thiocarbamide - A12828 - Alfa Aesar

A12828 Thiourea, 99%

Numéro de CAS
62-56-6
Synonymes
Thiocarbamide

Conditionnement Prix ($) Quantité Disponibilité
100g 24,70
500g 36,10
2500g 114,00
10000g 355,00
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Thiourea, 99%

MDL
MFCD00008067
EINECS
200-543-5

Propriétés chimiques

Formule
CH4N2S
Poids moleculaire
76.12
Point de fusion
172-178°
Densité
1.405
Solubilité
Soluble in water.

Applications

Reagent for organic synthesisUsed as a reagent for organic synthesis. Thiourea is a photographic fixative, and used in manufacture of resins. It acts as a catalyst for asymmetric reactions. It plays an essential role as a catalyst for highly enantio- and diastereoselective additions reaction of oxindoles to nitroolefins. It is also useful to improve the productivity of mung bean.

Notes

Stable. Incompatible with strong acids. Store in cool place. Keep container tightly closed in a dry and well-ventilated place. Handle and store under inert gas.

Références bibliographiques

Reagent for the conversion of alkyl halides to thiols by base hydrolysis of the isothiouronium salts; see also N-Acetyl­thiourea, B21198. Cleavage of isothiouronium salts with base and alkylation of the resulting thiolate has been used as a convenient synthesis of unsymmetrical sulfides: Synth. Commun., 14, 209 (1984).

Epoxides are converted to episulfides: J. Org. Chem., 26, 3467 (1961). The 2,3-epoxy alcohols resulting from the Sharpless enantioselective epoxidation can be converted to the corresponding episulfides with retention at both centers, using Ti(O-i-Pr)4 as mediator: J. Org. Chem., 53, 4114 (1988).

Widely used in heterocyclic syntheses, e.g. of thiazoles and pyrimidines.

Has been used in a convenient synthesis of isothiocyanates from oximes via the nitrile oxide: Tetrahedron Lett., 34, 8283 (1993); see also Benzaldoxime, A12053:

Bui, T.; Syed, S.; Barbas, C. F. Thiourea-Catalyzed Highly Enantio- and Diastereoselective Additions of Oxindoles to Nitroolefins: Application to the Formal Synthesis of (+) -Physostigmine. J. Am. Chem. Soc. 2009, 131 (25), 8758-8759.

Takemoto, Y. Development of Chiral Thiourea Catalysts and Its Application to Asymmetric Catalytic Reactions. Chem. Pharm. Bull. 2010, 58 (5), 593-601.

Mentions de danger et de prudence du SGH

Mentions de danger (UE): H302-H351-H361

Harmful if swallowed. Suspected of causing cancer. Suspected of damaging fertility or the unborn child.

Mentions de prudence: P201-P280-P301+P312a-P308+P313-P405-P501a

Obtain special instructions before use. Wear protective gloves/protective clothing/eye protection/face protection. IF SWALLOWED: Call a POISON CENTER/doctor if you feel unwell. IF exposed or concerned: Get medical advice/attention. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.

Autres références

Merck
14,9367
Beilstein
605327
Classe de danger
9
Groupe d'emballage
III
Code tarifaire harmonisé
2930.90
TSCA
Yes
RTECS
YU2800000

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