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14918-68-4

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14918-68-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 14918-68-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,4,9,1 and 8 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 14918-68:
(7*1)+(6*4)+(5*9)+(4*1)+(3*8)+(2*6)+(1*8)=124
124 % 10 = 4
So 14918-68-4 is a valid CAS Registry Number.

14918-68-4Relevant articles and documents

Nouvelles methodes de synthese de la naphtopurpurine (trihydroxy-2,5,8 naphtoquinone-1,4)

Bekaert, Alain,Andrieux, Jean,Plat, Michel

, p. 314 - 316 (2007/10/02)

The condensation of 1,2,4 trimethoxybenzene with maleic anhydride in the presence of AlCl3-NaCl affords, in a single step, naphtopurpurine 1, an important intermediate in the synthesis of naphtoquinone derived natural products.A different synthesis of compound 1 consists in the substitution of the halogen atom in 2-chloro or 2-bromo-naphthazirin by a methoxy group which is subsequently cleaved in an acidic medium or by a Lewis acid.

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