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775549-69-4

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775549-69-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 775549-69-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,7,5,5,4 and 9 respectively; the second part has 2 digits, 6 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 775549-69:
(8*7)+(7*7)+(6*5)+(5*5)+(4*4)+(3*9)+(2*6)+(1*9)=224
224 % 10 = 4
So 775549-69-4 is a valid CAS Registry Number.

775549-69-4Relevant articles and documents

Total synthesis of cyclopentenoporphyrins of sedimentary origin: deoxophylloerythroetioporphyrin, chlorophyll c fossils and related compounds.

Bauder, Claude,Ocampo, Ruben,Callot, Henry J.

, p. 5135 - 5150 (2007/10/02)

This article describes the total synthesis of seven porphyrins, fossils of chlorophyll derivatives, isolated from sedimentary sources and possess five-membered rings fused to the porphyrin nucleus, this additional ring being placed between positions 13,15 or 15,17.This ring was built from vinyl, hydroxyethyl or isopropenyl groups under strong acidic conditions. Key words: sedimentary porphyrins, chlorophyll geochemistry, total synthesis, E-ring formation.

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