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178681-99-7

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178681-99-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 178681-99-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,8,6,8 and 1 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 178681-99:
(8*1)+(7*7)+(6*8)+(5*6)+(4*8)+(3*1)+(2*9)+(1*9)=197
197 % 10 = 7
So 178681-99-7 is a valid CAS Registry Number.

178681-99-7Relevant articles and documents

Synthesis of some new pyrimidothienopyridazines and related heterocycles

Radwan,Kamal El-Dean,Bakhite

, p. 303 - 308 (2007/10/03)

5-Amino-3,4-diphenylthieno[2,3-c]pyridazine-6-carbonitrile 2a was reacted with propylene diamine to give tetrahydropyrimidinyl derivative 3. The latter compound (3) underwent certain cyclocondensation reactions to produce pyrimidothienopyridazines 4-6. Al

A General Route for the Synthesis of Pyrimidothienopyridazine Derivatives

Quintela, J. M.,Veiga, M. C.,Conde, S.,Peinador, C.

, p. 739 - 746 (2007/10/03)

A facile synthesis of 8-substituted pyrimidothienopyridazines (6a-i) has been accomplished.The sequence involves the ring closure of a heterocyclic aminonitrile precursor (3) after reaction with (dichlomethylene)-dimethylammonium chloride. - Keywords: Pyrimidothienopyridazine derivatives; Thienopyridazine-6-carbonitrile; N,N-Dimethyldichloromethyleniminium chloride; Enaminonitrile

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