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20387-71-7

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20387-71-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 20387-71-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,3,8 and 7 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 20387-71:
(7*2)+(6*0)+(5*3)+(4*8)+(3*7)+(2*7)+(1*1)=97
97 % 10 = 7
So 20387-71-7 is a valid CAS Registry Number.

20387-71-7Relevant articles and documents

A Convenient Preparation of 4,8-Dimethoxy-3-substituted-2(1H)-quinolones by an Electrophilic Reaction through Base-induced Deprotonation and its Synthetic Application for the Synthesis of New Alkaloids, 3,4,8-Trimethoxy-2(1H)-quinolone and 3-Formyl-4,7,8-trimethoxy-2(1H)-quinolone(Glycocitridine)

Tagawa, Yoshinobu,Kawaoka, Takamitsu,Goto, Yoshinobu

, p. 1677 - 1683 (2007/10/03)

Some 4,8-dimethoxy-3-substituted-2(1H)-quinolones were prepared by electrophilic reaction of 4,8-dimethoxy-2(1H)-quinolone with electrophiles in the presence of n-butyllithium-N,N,N',N',-tetramethylethylenediamine in fairly good yields. This present method was successfully applied for the synthesis of two new alkaloids bearing the 4,8-dimethoxy-2(1H)-quinolone skeleton.

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