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1621686-48-3

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1621686-48-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1621686-48-3 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,6,2,1,6,8 and 6 respectively; the second part has 2 digits, 4 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 1621686-48:
(9*1)+(8*6)+(7*2)+(6*1)+(5*6)+(4*8)+(3*6)+(2*4)+(1*8)=173
173 % 10 = 3
So 1621686-48-3 is a valid CAS Registry Number.

1621686-48-3Downstream Products

1621686-48-3Relevant articles and documents

Aqueous copper nitrate catalyzed synthesis of 3-alkylideneoxindoles from α-diazo-ketoanilides

Mo, Shanyan,Yang, Zhanhui,Xu, Jiaxi

, p. 3923 - 3929 (2014/06/24)

An economical, practical, and green protocol with which to synthesize 3-alkylideneoxindoles from α-diazo-ketoanilides has been developed. The approach employs inexpensive Cu(NO3)2·3H 2O as catalyst and environmentally friendly water as solvent, and achieves moderate to excellent yields. The method has good tolerance to a range of N-alkyl and N-aryl groups, including electron-withdrawing and electron-donating groups on the aromatic ring, ortho-, meta-, and para-substituents, and -aliphatic and -aromatic keto groups. A plausible mechanism involving intramolecular aromatic metal carbene electrophilic addition as the key step is proposed. Inexpensive Cu(NO3)2· 3H2O catalyst and environmentally friendly water solvent are employed for the transformation of α-diazo-ketoanilides into 3-alkylidene- oxindoles. The process is easily handled, economical, environmentally friendly, and can be used to convert a broad range of substrates in moderate to excellent yields. An intramolecular aromatic metal carbene electrophilic addition mechanism is proposed. Copyright

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