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120759-99-1

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120759-99-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 120759-99-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,0,7,5 and 9 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 120759-99:
(8*1)+(7*2)+(6*0)+(5*7)+(4*5)+(3*9)+(2*9)+(1*9)=131
131 % 10 = 1
So 120759-99-1 is a valid CAS Registry Number.

120759-99-1Relevant articles and documents

Synthesis of (E)-4-oxo-5-hexenals and their acetal derivatives

Kanemasa,Otsuka,Doi,Tsuge,Wada

, p. 1167 - 1169 (2007/10/02)

An effective synthesis of (E)-4-oxo-5-hexenals 6 and the acetals 5 starting from ethyl 2-alkoxy-1-cyclopropanecarboxylates 1a-d is presented. The acid-induced ring opening of the cyclopropanecarboxylates 1a, b followed by phosphorylmethylation or the phosphorylmethylation of the ester 1c followed by ring opening leads to the 5-acetal of 2,5-dioxopentylphosphonate 4. The Horner-Emmons olefination of 4 with various aldehydes produces the title compounds.

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