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433954-87-1

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433954-87-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 433954-87-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,3,3,9,5 and 4 respectively; the second part has 2 digits, 8 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 433954-87:
(8*4)+(7*3)+(6*3)+(5*9)+(4*5)+(3*4)+(2*8)+(1*7)=171
171 % 10 = 1
So 433954-87-1 is a valid CAS Registry Number.

433954-87-1Relevant articles and documents

A new and efficient synthesis of substituted 2-hydroxymethyl-2-methyl-2H-chromenes

Goujon,Zammattio,Pagnoncelli,Boursereau,Kirschleger

, p. 322 - 324 (2007/10/03)

A new and efficient three step procedure for the synthesis of functionalized 2H-chromenes 1 is described, starting from commercially available salicylaldehydes 2 and 2-methylpropenyl-magnesium chloride 3, which involves catalytic acid-mediated intramolecular cyclization of phenolic epoxide 5 as the key step.

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