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745809-52-3

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745809-52-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 745809-52-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,4,5,8,0 and 9 respectively; the second part has 2 digits, 5 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 745809-52:
(8*7)+(7*4)+(6*5)+(5*8)+(4*0)+(3*9)+(2*5)+(1*2)=193
193 % 10 = 3
So 745809-52-3 is a valid CAS Registry Number.

745809-52-3Downstream Products

745809-52-3Relevant articles and documents

Studies on the synthesis of landomycin A. Synthesis of the originally assigned structure of the aglycone, landomycinone, and revision of structure

Roush, William R.,Neitz, R. Jeffrey

, p. 4906 - 4912 (2007/10/03)

The originally proposed structure (2) of landomycinone, the aglycone of landomycin A, has been synthesized and shown to be nonidentical to the naturally derived landomycin A aglycone. The synthesis of 2 features the Doetz benzannulation reaction of chromium carbene 5 and alkyne 6, and the intramolecular Michael-type cyclization reaction of the phenolic naphthoquinone 20. It is proposed that natural landomycinone possesses the alternative structure 3, but attempts to access this structure via the Michael-type cyclization of the isomeric phenolic naphthoquinone 38 have been unsuccessful.

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