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133031-80-8

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133031-80-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 133031-80-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,3,0,3 and 1 respectively; the second part has 2 digits, 8 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 133031-80:
(8*1)+(7*3)+(6*3)+(5*0)+(4*3)+(3*1)+(2*8)+(1*0)=78
78 % 10 = 8
So 133031-80-8 is a valid CAS Registry Number.

133031-80-8Upstream product

133031-80-8Relevant articles and documents

A One-Pot Synthesis of Coumarins from Dipotassium O-Methoxybenzylidenemalonates

Hormi, Osmo E.O.,Peltonen, Carita,Bergstroem, Riitta

, p. 219 - 222 (2007/10/02)

o-Methoxybenzylidenemalonates 1, which are available from o-methoxybenzaldehydes and diethylmalonate, were hydrolysed to the dipotassium malonates 2.Treatment of the salts 2 with trifluoroacetic acid-trifluoroacetic anhydride gave the title coumarins by a demethylative ring-closure reaction in 60-80percent yield.

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