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1758-73-2

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1758-73-2 Usage

Chemical Properties

white crystalline powder

Uses

Different sources of media describe the Uses of 1758-73-2 differently. You can refer to the following data:
1. Convenient reagent for the reduction of ketones to secondary alcohols. Thiourea dioxide is an effective bleach when used alone or when used after hydrogen peroxide in a full bleaching process (Duffield, 1986; Cegarra et al, 1988). Bleaching with thiourea dioxide is not common practice but it is effective when used alone, and the process compares favorably with hydrogen peroxide bleaching. A formulation can include a commercial thiourea dioxide product, wetting agent and EDTA sequestering agent. Reductive bleaching is carried out at pH 7.0 at 70°C for 60 min (Duffield, 1986).
2. Convenient reagent for the reduction of ketones to secondary alcohols.

General Description

A white or light-yellow odorless crystalline powder. Mp:126°C. Soluble in water (27 g / L at room temperature). Decomposes exothermically at temperatures above 126°C with the emission of noxious gases (sulfur oxides, ammonia, carbon monoxide, nitrogen oxides and hydrogen sulfide) and carbon dioxide. Extended exposure to temperatures above 50°C and moisture may cause visible decomposition. Irritating to skin and mucous membranes. Corrosive to eye tissue. Used in leather processing, the paper industry, photographic industry, and in textile processing as a bleaching agent.

Air & Water Reactions

Soluble in water

Reactivity Profile

Thiourea dioxide is a reducing agent and a derivative of sulfinic acid (a weak inorganic acid). Decolorizes and bleaches materials by chemical reduction. Stable under normal temperatures and pressures. May decompose on exposure to moist air or water. Incompatible with strong oxidizing agents, strong bases. Aqueous solutions are acidic and corrosive.

Health Hazard

Fire will produce irritating, corrosive and/or toxic gases. Inhalation of decomposition products may cause severe injury or death. Contact with substance may cause severe burns to skin and eyes. Runoff from fire control may cause pollution.

Fire Hazard

Flammable/combustible material. May ignite on contact with moist air or moisture. May burn rapidly with flare-burning effect. Some react vigorously or explosively on contact with water. Some may decompose explosively when heated or involved in a fire. May re-ignite after fire is extinguished. Runoff may create fire or explosion hazard. Containers may explode when heated.

Flammability and Explosibility

Nonflammable

Purification Methods

Dissolve it in five parts of aqueous 1:1% NaHSO3 at 60-63o (charcoal), then allow it to crystallise slowly, with agitation, at 10o. Filter and dry it immediately at 60o [Koniecki & Linch Anal Chem 30 1134 1958]. [Beilstein 3 I 36, 3 IV 145.]

Check Digit Verification of cas no

The CAS Registry Mumber 1758-73-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,7,5 and 8 respectively; the second part has 2 digits, 7 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 1758-73:
(6*1)+(5*7)+(4*5)+(3*8)+(2*7)+(1*3)=102
102 % 10 = 2
So 1758-73-2 is a valid CAS Registry Number.
InChI:InChI=1/CH4N2O2S/c2-1(3-4)6-5/h2-3H2

1758-73-2 Well-known Company Product Price

  • Brand
  • (Code)Product description
  • CAS number
  • Packaging
  • Price
  • Detail
  • Alfa Aesar

  • (A11885)  Formamidinesulfinic acid, 98%   

  • 1758-73-2

  • 100g

  • 185.0CNY

  • Detail
  • Alfa Aesar

  • (A11885)  Formamidinesulfinic acid, 98%   

  • 1758-73-2

  • 500g

  • 888.0CNY

  • Detail
  • Aldrich

  • (F16001)  Formamidinesulfinicacid  ≥98%

  • 1758-73-2

  • F16001-100G

  • 279.63CNY

  • Detail

1758-73-2SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 10, 2017

Revision Date: Aug 10, 2017

1.Identification

1.1 GHS Product identifier

Product name Thiourea dioxide

1.2 Other means of identification

Product number -
Other names amino(imino)methanesulfinic acid

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only. Bleaching agents,Finishing agents
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:1758-73-2 SDS

1758-73-2Synthetic route

thiourea
17356-08-0

thiourea

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

Conditions
ConditionsYield
With peracetic acid In methanol; water at 10℃;86%
With dihydrogen peroxide In water at 8 - 10℃; for 1.5h;75%
With dihydrogen peroxide at 8 - 15℃; for 3h; pH=3 - 5;57.3%
peracetic acid
79-21-0

peracetic acid

acetic acid
64-19-7

acetic acid

thiourea
17356-08-0

thiourea

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

Conditions
ConditionsYield
je nach den Mengenverhaeltnissen;
ammonium thiocyanate
1147550-11-5

ammonium thiocyanate

thiourea
17356-08-0

thiourea

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

Conditions
ConditionsYield
With water; dihydrogen peroxide at 10 - 30℃;
formamidine disulfide dihydrochloride
14807-75-1

formamidine disulfide dihydrochloride

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

Conditions
ConditionsYield
With ammonium hydroxide; ammonium molybdate tetrahydrate; dihydrogen peroxide
methanol
67-56-1

methanol

thiourea
17356-08-0

thiourea

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

water
7732-18-5

water

thiourea
17356-08-0

thiourea

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

acetic acid
64-19-7

acetic acid

thiourea
17356-08-0

thiourea

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

thiourea
17356-08-0

thiourea

neutr.aqueous hydrogen peroxide

neutr.aqueous hydrogen peroxide

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

Conditions
ConditionsYield
at 0℃;
water
7732-18-5

water

dihydrogen peroxide
7722-84-1

dihydrogen peroxide

thiourea
17356-08-0

thiourea

A

formamidine disulfide
3256-06-2

formamidine disulfide

B

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

Conditions
ConditionsYield
vom pH 7.4;
formamidine disulfide
3256-06-2

formamidine disulfide

A

thiocyanogen
505-14-6

thiocyanogen

B

aminoiminomethanesulfonic acid
1184-90-3

aminoiminomethanesulfonic acid

C

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

D

thiourea
17356-08-0

thiourea

E

urea
57-13-6

urea

F

Thiourea sulfoxide

Thiourea sulfoxide

Conditions
ConditionsYield
With water; dihydrogen peroxide at 25℃; pH=2; Kinetics; pH-value;
formamidine disulfide
3256-06-2

formamidine disulfide

A

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

B

thiourea
17356-08-0

thiourea

C

urea
57-13-6

urea

Conditions
ConditionsYield
With sodium chlorate; sulfuric acid; sodium perchlorate; oxalic acid In water at 25℃; Kinetics;
[RuIII(ethylenediaminetetraacetate)(thiourea)](1-)

[RuIII(ethylenediaminetetraacetate)(thiourea)](1-)

dihydrogen peroxide
7722-84-1

dihydrogen peroxide

A

aminoiminomethanesulfonic acid
1184-90-3

aminoiminomethanesulfonic acid

B

formamidine disulfide
3256-06-2

formamidine disulfide

C

C9H10N2O8(4-)*HO2(1-)*Ru(3+)

C9H10N2O8(4-)*HO2(1-)*Ru(3+)

D

C9H10N2O8(4-)*O(2-)*Ru(5+)

C9H10N2O8(4-)*O(2-)*Ru(5+)

E

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

Conditions
ConditionsYield
In water at 25℃; pH=4.9; Kinetics; Mechanism;
[Ru(ethylenediaminetetraacetate)(H2O)]
15282-93-6, 199015-49-1

[Ru(ethylenediaminetetraacetate)(H2O)]

thiourea
17356-08-0

thiourea

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

Conditions
ConditionsYield
With 1 mM phosphate buffer In water at 25℃; pH=6.2;
[ruthenium(III)(ethylenediaminetetraacetic acid)(thiourea)]

[ruthenium(III)(ethylenediaminetetraacetic acid)(thiourea)]

thiourea
17356-08-0

thiourea

A

[Ru(ethylenediaminetetraacetate)(H2O)]
15282-93-6, 199015-49-1

[Ru(ethylenediaminetetraacetate)(H2O)]

B

formamidine disulfide
3256-06-2

formamidine disulfide

C

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

Conditions
ConditionsYield
With oxone In water at 25℃; pH=6.2; Kinetics; Mechanism; Concentration;
thiourea
17356-08-0

thiourea

A

formamidine disulfide
3256-06-2

formamidine disulfide

B

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

Conditions
ConditionsYield
With sodium perchlorate; hypochloric acid; sodium hydroxide In water at 25℃; Kinetics;
Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

aminoiminomethanesulfonic acid
1184-90-3

aminoiminomethanesulfonic acid

Conditions
ConditionsYield
With peracetic acid In acetic acid 1.) at addition below 20 deg C, 2.) after addition room temp. 2 h.;97%
With sulfuric acid; dihydrogen peroxide at 50℃; for 1.16667h;93%
With sulfuric acid; dihydrogen peroxide at 55℃; for 1.58333h;83.3%
3-(1-(trifluoromethyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-1-yl)propan-1-amine

3-(1-(trifluoromethyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-1-yl)propan-1-amine

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

1-(3-(1-(trifluoromethyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-1-yl)propyl)guanidine

1-(3-(1-(trifluoromethyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-1-yl)propyl)guanidine

Conditions
ConditionsYield
With triethylamine In methanol; water95%
5-(1-(trifluoromethyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-1-yl)pentan-1-amine

5-(1-(trifluoromethyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-1-yl)pentan-1-amine

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

1-(5-(1-(trifluoromethyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-1-yl)pentyl)guanidine

1-(5-(1-(trifluoromethyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-1-yl)pentyl)guanidine

Conditions
ConditionsYield
With triethylamine In methanol; water92%
Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

L-Tryptophan
73-22-3

L-Tryptophan

L-N-Formamidinetryptophan
91568-61-5

L-N-Formamidinetryptophan

Conditions
ConditionsYield
With sodium hydroxide at 20℃; Substitution; N-Formamidinylation;91.8%
4-(1-(trifluoromethyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-1-yl)butan-1-amine

4-(1-(trifluoromethyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-1-yl)butan-1-amine

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

1-(4-(1-(trifluoromethyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-1-yl)butyl)guanidine

1-(4-(1-(trifluoromethyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-1-yl)butyl)guanidine

Conditions
ConditionsYield
With triethylamine In methanol; water91%
Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

17-(cyclopropylmethyl)-17'-(ethylamino)-6,6',7,7'-tetradehydro-4,5α:4',5α'-diepoxy-6,6'-imino-7,7'-bimorphinan-3,3',14,14'-tetrol hydrochloride

17-(cyclopropylmethyl)-17'-(ethylamino)-6,6',7,7'-tetradehydro-4,5α:4',5α'-diepoxy-6,6'-imino-7,7'-bimorphinan-3,3',14,14'-tetrol hydrochloride

17-(cyclopropylmethyl)-17'-(2-guanidinoethyl)-6,6',7,7'-tetradehydro-4,5α:4',5α'-diepoxy-6,6'-imino-7,7'-bimorphinan-3,3',14,14'-tetrol sulfinate

17-(cyclopropylmethyl)-17'-(2-guanidinoethyl)-6,6',7,7'-tetradehydro-4,5α:4',5α'-diepoxy-6,6'-imino-7,7'-bimorphinan-3,3',14,14'-tetrol sulfinate

Conditions
ConditionsYield
With triethylamine In N,N-dimethyl-formamide Ambient temperature;90%
((E)-3-Oxo-but-1-enyl)-triphenyl-phosphonium; chloride
135425-59-1

((E)-3-Oxo-but-1-enyl)-triphenyl-phosphonium; chloride

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

<4-methyl-(5-methylimidazolyl)>triphenylphosphonium chloride
63612-38-4

<4-methyl-(5-methylimidazolyl)>triphenylphosphonium chloride

Conditions
ConditionsYield
With N,N,N',N'-tetramethyl-1,8-diaminonaphthalene In dimethyl sulfoxide at 80℃; var. bases;89%
hexan-1-amine
111-26-2

hexan-1-amine

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

N-hexylguanidine

N-hexylguanidine

Conditions
ConditionsYield
With sodium hydroxide In water at 20 - 60℃;85%
sarcosine
107-97-1

sarcosine

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

Creatinine
57-00-1

Creatinine

Conditions
ConditionsYield
With sodium hydroxide at 20℃; Substitution; N-Formamidinylation;83.2%
(S)-2-phenylglycine
2935-35-5

(S)-2-phenylglycine

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

N-Formamidine-L-phenylglycine

N-Formamidine-L-phenylglycine

Conditions
ConditionsYield
With sodium hydroxide at 20 - 60℃; Substitution; N-Formamidinylation;82.4%
Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

tert-butyl (piperidin-3-ylmethyl)carbamate
142643-29-6

tert-butyl (piperidin-3-ylmethyl)carbamate

(RS)-<<1-(aminoiminomethyl)piperidin-3-yl>methyl>carbamic acid tert-butyl ester
140645-13-2

(RS)-<<1-(aminoiminomethyl)piperidin-3-yl>methyl>carbamic acid tert-butyl ester

Conditions
ConditionsYield
With triethylamine In N,N-dimethyl-formamide for 15h; Ambient temperature;82%
tris[2-perfluorohexylethyl]tin-3-benzylamine

tris[2-perfluorohexylethyl]tin-3-benzylamine

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

tris[2-perfluorohexylethyl]tin-3-benzylguanidine

tris[2-perfluorohexylethyl]tin-3-benzylguanidine

Conditions
ConditionsYield
In methanol at 20℃; for 16h;82%
Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

nitensidine D

nitensidine D

Conditions
ConditionsYield
With sodium hydroxide In water at 20 - 60℃;81%
Phenylalanine
150-30-1

Phenylalanine

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

α-guanidino-β-phenylpropionic acid
88728-27-2

α-guanidino-β-phenylpropionic acid

Conditions
ConditionsYield
With sodium hydroxide at 20 - 60℃; Substitution; N-Formamidinylation;78.2%
Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

Conditions
ConditionsYield
With sodium hydroxide In water at 20 - 60℃; Inert atmosphere;76%
L-alanin
56-41-7

L-alanin

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

N-Formamidine-L-alanine
1758-74-3

N-Formamidine-L-alanine

Conditions
ConditionsYield
With sodium hydroxide at 20℃; Substitution; N-Formamidinylation;73.2%
Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

3-amino propanoic acid
107-95-9

3-amino propanoic acid

3-guanidinopropionic acid
353-09-3

3-guanidinopropionic acid

Conditions
ConditionsYield
With sodium hydroxide at 20℃; Substitution; N-Formamidinylation;72.1%
glycylglycine
556-50-3

glycylglycine

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

N-Formamidineglycylglycine
2446-72-2

N-Formamidineglycylglycine

Conditions
ConditionsYield
With sodium hydroxide at 20 - 60℃; Substitution; N-Formamidinylation;70.2%
Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

glycine
56-40-6

glycine

guanidineacetic acid
352-97-6

guanidineacetic acid

Conditions
ConditionsYield
With sodium hydroxide at 20℃; Substitution; N-Formamidinylation;70.2%
4-Bromo-2-nitroaniline
875-51-4

4-Bromo-2-nitroaniline

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

5-bromo-1H-benzo[d]imidazole
4887-88-1

5-bromo-1H-benzo[d]imidazole

Conditions
ConditionsYield
With sodium hydroxide In ethanol; water at 70℃; for 1.5h; Green chemistry;68%
Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

2-nitro-aniline
88-74-4

2-nitro-aniline

benzoimidazole
51-17-2

benzoimidazole

Conditions
ConditionsYield
With sodium hydroxide In ethanol; water at 70℃; for 1h; Solvent; Green chemistry;65%
Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

4-Chloro-2-nitroaniline
89-63-4

4-Chloro-2-nitroaniline

5-chloro-1H-benzimidazole
4887-82-5

5-chloro-1H-benzimidazole

Conditions
ConditionsYield
With sodium hydroxide In ethanol; water at 70℃; for 1h; Green chemistry;64%
L-leucine
61-90-5

L-leucine

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

N-Formamidine-L-leucine
79198-90-6

N-Formamidine-L-leucine

Conditions
ConditionsYield
With sodium hydroxide at 20 - 60℃; Substitution; N-Formamidinylation;63.2%
2-nitro-4-fluoroaniline
364-78-3

2-nitro-4-fluoroaniline

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

5-fluoro-1H-benzoimidazole
1977-72-6

5-fluoro-1H-benzoimidazole

Conditions
ConditionsYield
With sodium hydroxide In ethanol; water at 70℃; for 1h; Green chemistry;62%
Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

4-methyl-2-nitroaniline
89-62-3

4-methyl-2-nitroaniline

5-methylbenzimidazole
614-97-1

5-methylbenzimidazole

Conditions
ConditionsYield
With sodium hydroxide In ethanol; water at 70℃; for 2h; Green chemistry;60%
Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

4-methoxy-2-nitroaniline
96-96-8

4-methoxy-2-nitroaniline

5-methoxy-1H-benzimidazole
4887-80-3

5-methoxy-1H-benzimidazole

Conditions
ConditionsYield
With sodium hydroxide In ethanol; water at 70℃; for 1.5h; Green chemistry;59%
2-Methyl-6-nitroaniline
570-24-1

2-Methyl-6-nitroaniline

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

4-methylbenzimidazole
4887-83-6

4-methylbenzimidazole

Conditions
ConditionsYield
With sodium hydroxide In ethanol; water at 70℃; for 2h; Green chemistry;57%
2-ethylanthraquinone
84-51-5

2-ethylanthraquinone

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

2-ethyl-9,10-bis(2,3-dihydroxypropoxy)anthracene

2-ethyl-9,10-bis(2,3-dihydroxypropoxy)anthracene

Conditions
ConditionsYield
Stage #1: 2-ethylanthraquinone; Aminoiminomethanesulfinic acid With sodium hydroxide at 60℃; for 1h;
Stage #2: With oxiranyl-methanol In ethanol at 55℃; for 3h;
52%
2,4-dibromo-6-nitroaniline
827-23-6

2,4-dibromo-6-nitroaniline

Aminoiminomethanesulfinic acid
1758-73-2

Aminoiminomethanesulfinic acid

5,7-dibromo-1H-benzoimidazole
69038-75-1

5,7-dibromo-1H-benzoimidazole

Conditions
ConditionsYield
With sodium hydroxide In ethanol; water at 70℃; for 3h; Green chemistry;50%

1758-73-2Relevant articles and documents

HETEROGENEOUS SYNTHESIS OF METHYLENE DIANILINE

-

Page/Page column 33-35, (2021/06/22)

The present invention relates to a catalytic material for the preparation of one or more of 4,4'- methylenedianiline, 2,2'-methylenedianiline, 2,4'-methylenedianiline, and oligomers of two or more thereof, the catalytic material comprising an oxidic support, wherein the oxidic support comprises an element EOS1 selected from the group consisting of Ti, Zr, Al, Si, and mixtures of two or more thereof, and further comprising a supported material supported on the oxidic support, wherein the supported material comprises an element ESM1 selected from the group consisting of Ti, Zr, V, Nb, Ta, Mo, W, Ge, Sn, Sc, Y, La, Ce, Nd, Pr, Hf, Cr, Fe, Co, Ni, Cu, Zn, Pb, and mixtures of two or more thereof. Further, the present invention relates in particular to a process for the preparation of a catalytic material and to a process for the preparation of one or more of 4,4'-methylenedianiline, 2,2'-methylenedianiline, 2,4'-methylenedianiline and oligomers of two or more thereof.

Electrooxidation of Formamidine Disulfide Simultaneously Investigated by On-Line High Performance Liquid Chromatography and Cyclic Voltammetry

Feng, Na,Li, Fengli,Liu, Yang,Luo, Hainan,Zhang, Baoying,Zhang, Wei,Zhao, Yuyan

, p. 1074 - 1080 (2021/11/03)

The electro-oxidation of formamidine disulfide, an important sulfur-containing compound, was simultaneously investigated with on-line high-performance liquid chromatography and cyclic voltammetry. Using a home-made microporous sampler located at the electrode interface, the solution on the electrode surface was in situ sampled and analyzed. The electrochemical scanning was synchronously performed, which allowed the electro-oxidation products to be detected at a given potential. The main products on the surface of platinum electrode were found to be thiourea, formamidine sulfinic acid, cyanamide, and elemental sulfur. Forced convection arising from the sampling played an important role in the electrochemical oxidation. The extraction of electrode surface solution promoted the renewal of reactant and its intermediates, which induced the change of cyclic voltammetry curve. The forced convection also contributed to the redox peak current of the species on the cyclic voltammetry curves through the change of concentration of reactant and its intermediates. This technique can help to explore the reaction mechanism of complex electrochemical reactions.

Selective oxidation of thiourea with H2O2 catalyzed by [RuIII(edta)(H2O)]-: Kinetic and mechanistic studies

Chatterjee, Debabrata,Rothbart, Sabine,Van Eldik, Rudi

, p. 4725 - 4729 (2013/05/09)

Reported here is the first example of a ruthenium complex, [Ru III(edta)(H2O)]- (edta4- = ethylenediaminetetraacetate), that catalyzes the oxidation of thiourea (TU) in the presence of H2O2. The kinetics and mechanism of this reaction were investigated in detail by using rapid-scan spectrophotometry as a function of both the hydrogen peroxide and thiourea concentrations at pH 4.9 and 25 °C. Spectral analyses and kinetic data clearly support a catalytic process in which hydrogen peroxide reacts directly with thiourea coordinated to the RuIII(edta) complex. HPLC product analyses revealed the formation of formamidine disulfide (TU2) as a major product at the end of the catalytic process, however, formation of other products like thiourea dioxide (TUO2), thiourea dioxide (TUO3) and sulfate was also observed after longer reaction times. Catalytic intermediates such as [Ru III(edta)(OOH)]2- and [RuV(edta)(O)] - were evidently found to be non-reactive in catalyzing the oxidation of thiourea by H2O2 under the specified conditions. The Royal Society of Chemistry 2013.

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