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81556-13-0

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81556-13-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 81556-13-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,5,5 and 6 respectively; the second part has 2 digits, 1 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 81556-13:
(7*8)+(6*1)+(5*5)+(4*5)+(3*6)+(2*1)+(1*3)=130
130 % 10 = 0
So 81556-13-0 is a valid CAS Registry Number.

81556-13-0Downstream Products

81556-13-0Relevant articles and documents

Ring Transformation of 1,3,4-Oxadiazole to s-Triazole-Fused Heterocycles. New Synthetic Route for Thiazolo-s-triazole and 7H-s-Triazolothiadiazine

Sasaki, Tadashi,Ito, Eikoh,Shimizu, Ikuo

, p. 2757 - 2760 (2007/10/02)

s-Triazole-fused heterocycles have been synthesized by an intramolecular transformation of some 1,3,4-oxadiazole ketones with ammonia or hydrazine.The α- ketone 2m gave thiazolo-s-triazole (4m), accompanied by a small amount of the hydrazide 9m on treatment with ammonium acetate in acetic acid.Similar treatment of ketones 2a and 2b afforded only the hydrazides 9a and 9b, respectively.Ketones 2a-n reacted with hydrazine hydrate in acetic acid to give 7H-s-triazolothiadiazines 5a-n.However, ketones 2o-q, with substituents α to the carbonyl group, could not be converted to the corresponding fused-ring systems.Mechanisms for these transformations are proposed.

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