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138768-75-9

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138768-75-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 138768-75-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,7,6 and 8 respectively; the second part has 2 digits, 7 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 138768-75:
(8*1)+(7*3)+(6*8)+(5*7)+(4*6)+(3*8)+(2*7)+(1*5)=179
179 % 10 = 9
So 138768-75-9 is a valid CAS Registry Number.

138768-75-9Relevant articles and documents

Polycyclic N-hetero compounds. XLII: Convenient syntheses of 6,7-dihydro-5H-pyrido[2,3-b]pyrimido[4,5-d]azepine as a novel polyheterocyclic ring system and its 4-substituted derivatives

Nagamatsu,Hantani,Takaishi,Sasaki,Hirota

, p. 942 - 946 (1991)

A convenient synthetic route for the syntheses of 6,7-dihydro-5H-pyrido[2,3-6]pyrimido[4,5-d]azepine and its 4-substituted derivatives starting from ethyl 2-aminopyridine-3-carboxylate is described as the fist example of the unknown ring system. A new cla

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