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75218-45-0

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75218-45-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 75218-45-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,5,2,1 and 8 respectively; the second part has 2 digits, 4 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 75218-45:
(7*7)+(6*5)+(5*2)+(4*1)+(3*8)+(2*4)+(1*5)=130
130 % 10 = 0
So 75218-45-0 is a valid CAS Registry Number.

75218-45-0Relevant articles and documents

STUDIES ON HETEROCYCLIC COMPOUNDS VI. Synthesis of Thiophene Isoesters of Protoberberine Alkaloids

Jeganathan, S.,Srinivasan, M.

, p. 125 - 138 (2007/10/02)

Synthesis of thiophene isosters of protoberberine alkaloids (6, 12, 19) is described.The Mannich type reaction of the tetrahydroisoquinolines (5, 11) and the thienopyridine (18) with formaldehyde in glacial acetic acid afforded the title compounds.Cyclization of the tetrahydroisoquinoline derivative (23) failed to furnish the D-ring protoberberine isoster (25), but gave an unexpected product, the oxazepinoisoquinoline derivative (24).The conversion of the compound (24) to the 2-substituted isoquinoline (27) is also described.

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