Cas 1227809-99-5,C21H17N5

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Check Digit Verification of cas no

The CAS Registry Mumber 1227809-99-5 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,2,7,8,0 and 9 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 1227809-99:
(9*1)+(8*2)+(7*2)+(6*7)+(5*8)+(4*0)+(3*9)+(2*9)+(1*9)=175
175 % 10 = 5
So 1227809-99-5 is a valid CAS Registry Number.

1227809-99-5Upstream product

1227809-81-5 6-chloro-3-methyl-4-(4-methylphenyl)-1-phenylpyrazolo[3,4-b]pyridine-5-carbaldehyde

1227809-99-5Downstream Products

1227809-99-5Relevant academic research and scientific papers

Preparation of 6-chloropyrazolo[3,4-b]pyridine-5-carbaldehydes by Vilsmeier-Haack reaction and its use in the synthesis of heterocyclic chalcones and dipyrazolopyridines

Quiroga, Jairo,Diaz, Yurina,Insuasty, Braulio,Abonia, Rodrigo,Nogueras, Manuel,Cobo, Justo

experimental part, p. 2928 - 2930 (2010/06/16)

Novel 6-chloropyrazolo[3,4-b]pyridine-5-carbaldehydes 5 have been synthesized from the 4,5-dihydropyrazolo[3,4-b]pyridine-6-ones 4 via Vilsmeier-Haack reaction. Further treatment of carbaldehydes 5 with acetophenones 6 and hydrazine hydrate afforded chalc

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