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128405-29-8

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128405-29-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 128405-29-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,4,0 and 5 respectively; the second part has 2 digits, 2 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 128405-29:
(8*1)+(7*2)+(6*8)+(5*4)+(4*0)+(3*5)+(2*2)+(1*9)=118
118 % 10 = 8
So 128405-29-8 is a valid CAS Registry Number.

128405-29-8Downstream Products

128405-29-8Relevant articles and documents

Reactions with 2(1H)-quinolinone and coumarine derivatives: New routes to polysubstituted 2(1H)-quinolinone and coumarine derivatives

El-Taweel,Sowellim,Elagamey

, p. 905 - 910 (2007/10/02)

Whereas 2H-pyrano[3,2-c[quinoline-2,5(6H)-dione (2a) or 3-acetyl-1-methyl-2(1H)-quinolinone (3a) reacted with the benzylidenenitriles 1a-f or a mixture of either malononitrile or ethyl cyanoacetate and aromatic aldehydes in ethanol/piperidine to give 4H-pyran derivatives 8, the reaction of 2b,c or 3b,c with the same reagents afforded 4,6-dihydro-5H-pyrano[3,2-c]quinolin-5-ones 11. Compounds 11 were also prepared from 1a-f and 3d,e,f. Reaction of pyrano[3,2-c]coumarin 2d with 1a yielded 6H,11H-[2]benzopyrano[4,3-c]-[1]benzopyran-6,11-dione (15). Treatment of 17 with aqueous potassium cyanide or hydroxylamine afforded the 2(1H)-quinolinone derivatives 19 and 20 respectively.

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