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40683-42-9

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40683-42-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 40683-42-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,0,6,8 and 3 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 40683-42:
(7*4)+(6*0)+(5*6)+(4*8)+(3*3)+(2*4)+(1*2)=109
109 % 10 = 9
So 40683-42-9 is a valid CAS Registry Number.

40683-42-9Downstream Products

40683-42-9Relevant academic research and scientific papers

Fungal Pigments, 49. - Synthesis of Grevillins and Related 2H-Pyran-2,5(6H)-diones

Lohrisch, Hans-Joachim,Kopanski, Lothar,Herrmann, Rupert,Schmidt, Holger,Steglich, Wolfgang

, p. 177 - 194 (2007/10/02)

A convergent synthesis of grevillins 1 starts from diazoesters 6 which are converted into 3-aryl-2-oxopropyl ethyl oxalates 4 via bromoketones 7.Cyclization of 4 leads to pyrandiones 2 which are condensed with aromatic aldehydes to yield 4-aryl-2-benzylid

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