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223386-93-4

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223386-93-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 223386-93-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,3,3,8 and 6 respectively; the second part has 2 digits, 9 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 223386-93:
(8*2)+(7*2)+(6*3)+(5*3)+(4*8)+(3*6)+(2*9)+(1*3)=134
134 % 10 = 4
So 223386-93-4 is a valid CAS Registry Number.

223386-93-4Relevant articles and documents

Synthesis of symmetrical and unsymmetrical 2,5-bis(trialkylsilyl)furans and 2,6-bis(trialkylsilyl)-4H-pyrans from 1,4- and 1,5-bis(acylsilanes)

Bouillon, Jean-Philippe,Saleur, Damien,Portella, Charles

, p. 843 - 849 (2000)

2,5-Bis(trialkylsilyl)furans and 2,6-bis(trialkylsilyl)-4Hpyrans have been synthesized by cyclodehydration of 1,4- and 1,5-bis(acylsilanes) under p-toluenesulfonic acid catalysis. The 1,4-bis(acylsilanes) have been prepared from 1,2-bis(1,3-dithian-2yl)ethane according to the reaction sequence metallation-silylationdethioketalization. The 1,5-bis(acylsilanes) have been prepared from 1,3-bis(1,3-dithian-2-yl)propane by a similar strategy or from a S(N) reaction of 1,3-dihalopropanes with 2-trialkylsilyl-2-lithio- 1,3dithiane and deprotection. The method allows efficient preparation of symmetrical as well as unsymmetrical bis(silylated) heterocycles.

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