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2-Amino-5-mercapto-1,3,4-thiadiazole (AMTD);5-Amino-1,3,4-thiadiazole-2-thiol
Molecular formula : C2H3N3S2
MW : 133.19
CAS No. :2349-67-9

nature : from the water in crystallization temperature 233-234 ° C (decomposition)

Preparation : hydrazine sulfate, ammonium thiocyanate condensation heavy schedule Two-thiourea, and then derived cyclization reaction. Process is as follows : (1) condensation, rearrangement of ammonium thiocyanate and hydrazine sulfate is added to the water, heated to 75 ° C, holding 2.5 hours at 100 ° C for 2 h return. By adding 45% sulfuric acid to reflux 1h, Leng to 40 ° C, was expected to continue cooling to 25 ° C, sodium hydroxide solution and adjust to pH3-4, filter, filter cake washed with ice to pH4-5, double thiourea crude. Crude goods and water, activated carbon, 90 ° C for 1 hour bleaching, filtration, liquid cooling and crystallization. Filtration, filtrate water use for the reaction. Filter cake drying, double-thiourea products. The yield of 60%. (2) cyclization of water (or two-thiourea refined liquor) and hydrochloric acid blending, 60 ° C by adding 0.07 (about total 1 / 15) - thiourea. 80 ° C by adding calcium phosphate Asian (or Asian scales sodium), 85 ° C accession to the remaining two-thiourea. Returning 4h. Leng to 20 ° C, filter, filter cake washed with ice water to pH4-5, drying, 2-amino-5-mercapto-1 ,3,4 - thiadiazole.

purposes : pesticide and pharmaceutical intermediates.


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Structure:
More Detailed Data:
1) 2-Amino-5-mercapto-1,3,4-thiadiazole;5-Amino-1,3,4-thiadiazole-2-thiol
2) 3,4-Thiadiazole-2(3H)-thione, 5-amino-1;2-Amino-5-mercapto-1,3,4-thiadiazole;4-thiadiazole-2-thiol, 5-amino-3;4-thiadiazole-2(3h)-thione, 5-amino-3;2-amino-1,3,4-thiadiazole-5-thiol;2-thiol-5-amino-1,3,4-thiadiazole;5-amino-1,3,4-thiadiazole-2(3h)-thione
3) 2-amino-5-mercapto-1,3,4-thiiodiazole;5-Amino-1,3,4-thiadiazole-2-thiol;5-amino-1,3,,4-thialiazoline-2(3H)-thione
4) 1,3,4-thiadiazole-2(3h)-thione;2-mercapto-1,3,4-thiadiazole;1,3,4-Thiadiazole-2-thiol
5) 2-Mercapto-1,3,4-thiadiazole;1,3,4-Thiadiazole-2-thiol
6) 2-mercapto-1,3,4-thiadiazole;1,3,4-thiadiazole-2-thiol
7) Thiadiazole;2-mercapto-5-methyl-1,3,4-thiadiazole;5-Methyl-1,3,4-thiadiazole-2-thiol;2-Mercapto-5-methyl-1,3,4-thiadiazde;methyl mercapto thiadiazole;1,3,4-thiadiazole;1,3.4-Thiadiazole
8) Thiadiazole;5-Methyl-1,3,4-thiadiazole-2-thiol;2-Mercapto-5-methyl-1,3,4-thiadiazde
9) N,N'-Methylene-bis(2-amino-5-mercapto-1,3,4-thiadiazole
10) Saikuzuo;Teqingshuang;Chuanhua-018;Yekuzuo
Notice Some description was translated by software and the data is only as a reference.
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