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116140-90-0

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116140-90-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 116140-90-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,6,1,4 and 0 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 116140-90:
(8*1)+(7*1)+(6*6)+(5*1)+(4*4)+(3*0)+(2*9)+(1*0)=90
90 % 10 = 0
So 116140-90-0 is a valid CAS Registry Number.

116140-90-0Relevant articles and documents

Highly Efficient Syntheses of Alkyl 3,3-Dialkoxypropanoates, Alkyl 4-Ethoxy-2-oxo-3-butenoates, and Monoprotected Malonaldehydes

Tietze, Lutz-F.,Meier, Heinrich,Voss, Edgar

, p. 274 - 277 (1988)

Haloform reaction of 4-alkoxy-1,1,1-trichloro-3-buten-2-ones, which can be obtained by acylation of enol ethers, gives 3,3-dialkoxypropanoic esters.Transacetalization of ethyl 3,3-diethoxypropanoate with 2,2-dimethyl-1,3-propanediol, followed by reduction and oxidation with DMSO/oxalyl chloride yields a monoprotected malonaldehyde. 4-Ethoxy-2-oxo-3-butenoates are synthesized either by acylation of enol ethers with alkoxalyl chlorides or by Claisen condensation of alkyl pyruvates with orthoesters.

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