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223787-58-4

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223787-58-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 223787-58-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,3,7,8 and 7 respectively; the second part has 2 digits, 5 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 223787-58:
(8*2)+(7*2)+(6*3)+(5*7)+(4*8)+(3*7)+(2*5)+(1*8)=154
154 % 10 = 4
So 223787-58-4 is a valid CAS Registry Number.

223787-58-4Relevant articles and documents

Synthesis of substituted 10,11-dihydro-5H-dibenz[b,f]azepines; key synthons in syntheses of pharmaceutically active compounds

Jorgensen, Tine Krogh,Andersen, Knud Erik,Lau, Jesper,Madsen, Peter,Huusfeldt, Per Olaf

, p. 57 - 64 (2007/10/03)

Substituted 10,11-dihydro-5H-dibenz[b,f]azepines are key synthons in the syntheses of a number of pharmaceutically active compounds such as imipramine, chlorimipramine, and desimipramine analogues. A facile synthesis of substituted 10,11-dihydro-5H-dibenz[b,f]azepines is described, starting out from commercially available 2-bromotoluenes or 2-nitrotoluenes. Initial α-bromination with N-bromosuccinimide and subsequent reaction with triethylphosphite afforded the corresponding benzyl phosphonic ester derivatives. After reaction with benzaldehyde derivatives, the expected Horner-Emmons reaction products were obtained. Hydrogenation gave the amino derivatives which were transformed into the corresponding formamides. Under Goldberg conditions [1], the final ring closing step was performed to give the substituted 10,11-dihydro-5H-dibenz[b,f]azepines in 46-75% yield.

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