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87902-92-9

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87902-92-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 87902-92-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,7,9,0 and 2 respectively; the second part has 2 digits, 9 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 87902-92:
(7*8)+(6*7)+(5*9)+(4*0)+(3*2)+(2*9)+(1*2)=169
169 % 10 = 9
So 87902-92-9 is a valid CAS Registry Number.

87902-92-9Downstream Products

87902-92-9Relevant articles and documents

Convergent and Efficient Synthesis of Spiro

Rosenberg, Saul H.,Rapoport, Henry

, p. 56 - 62 (2007/10/02)

A synthesis is presented of spiro, tricyclic analogues containing the A, N, and O rings of codeine.Two successive 1,4-additions into a pyridine residue, an intermolecular aryllithium addition followed by an intramolecular ester enolate ring closure, establish the spiro system.Reduction and finally α-methylene lactam rearrangment provide the necessary functionalization for further elaboration and C-ring closure.

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