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91999-49-4

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91999-49-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 91999-49-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,9,9 and 9 respectively; the second part has 2 digits, 4 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 91999-49:
(7*9)+(6*1)+(5*9)+(4*9)+(3*9)+(2*4)+(1*9)=194
194 % 10 = 4
So 91999-49-4 is a valid CAS Registry Number.

91999-49-4Relevant articles and documents

NMR Properties and Synthesis of Ring-methylated 1,4-Dihydronicotinamides and the Corresponding Pyridinium Salts. Correlation of NMR with Ab Initio STO-3G Results

Bossaerts, Jan D.,Dommisse, Roger A.,Alderweireldt, Frank C.,Geerlings, Paul

, p. 2360 - 2384 (2007/10/02)

The synthesis of a series of ring-methylated 1-alkyl-1,4-dihydronicotinamides and the corresponding pyridinium salts is described.Their NMR properties involving aromatic-ring-shielding anisotropy, due to ring current effects, are discussed and compared with electron populations calculated from STO-3G results.

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