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77746-63-5

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77746-63-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 77746-63-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,7,4 and 6 respectively; the second part has 2 digits, 6 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 77746-63:
(7*7)+(6*7)+(5*7)+(4*4)+(3*6)+(2*6)+(1*3)=175
175 % 10 = 5
So 77746-63-5 is a valid CAS Registry Number.

77746-63-5Relevant articles and documents

One-Pot Acid-Promoted Synthesis of 6-Aminopyrazolopyrimidines from 1 H-Pyrazol-5-yl- N, N-dimethylformamidines or 5-Amino-1 H-pyrazole-4-carbaldehydes with Cyanamide

Tseng, Ching-Chun,Tsai, Shuo-En,Li, Sin-Min,Wong, Fung Fuh

, p. 16157 - 16170 (2019/12/24)

A convenient and efficient one-pot acid-promoted synthesis of 6-aminopyrazolo[3,4-d]pyrimidine has been developed by treatment of 1H-pyrazol-5-yl-N,N-dimethylformamidines or 5-amino-1H-pyrazole-4-carbaldehydes with cyanamide (NH2CN) in an acid-

VILSMEIER-HAACK REACTION OF 5-AMINO- AND 5-ACYLAMINO-PYRAZOLES

Simay, A.,Takacs, K.,Horvath, K.,Dvortsak, P.

, p. 127 - 140 (2007/10/02)

The Vilsmeier-Haack reaction of 5-aminopyrazole derivatives 1 was investigated in view of contradictory literature reports.Structure 2 of the products was proved both chemically and spectroscopically.The mechanism of the reaction was postulated on the basis of isolated intermediates 7 and 8. 5-Acylaminopyrazoles 9, 10 and 11 were found to give also 2 (and 7) under the Vilsmeier conditions by an acyl splitting reaction, proceeding probably via diacylamino derivatives 12.Compounds 2 provided a simple route to pyrazolopyrimidine derivatives 13 and 14 as well as to azomethine compounds 15-18.

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