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78502-13-3

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78502-13-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 78502-13-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,8,5,0 and 2 respectively; the second part has 2 digits, 1 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 78502-13:
(7*7)+(6*8)+(5*5)+(4*0)+(3*2)+(2*1)+(1*3)=133
133 % 10 = 3
So 78502-13-3 is a valid CAS Registry Number.

78502-13-3Relevant articles and documents

Unsaturated Crown Ethers. 3. Syntheses of Stilbeno Crown Ethers

Inoue, Yoshihisa,Harino, Hiroya,Nakazato, Toshiyo,Koseki, Noriaki,Hakushi, Tadao

, p. 5151 - 5156 (2007/10/02)

A series of 6-, 9-, and 15-membered monostilbeno crown ethers (3) and 18-, 24-, and 30-membered distilbeno crown ethers (4), some of which are new compounds, were synthesized in the base-induced reactions of benzoin (1) with oligoethylene glycol ditosylates (2a-d) in homogeneous and heterogeneous solutions.The template effect is shown to be effective in controlling product yields and 4/3 ratios.

UNSATURATED CROWN ETHERS: STILBENO-CROWN ETHERS

Inoue, Yoshihisa,Ouchi, Mikio,Nakazato, Toshiyo,Matsuda, Takashi,Hakushi, Tadao

, p. 781 - 784 (2007/10/02)

Stilbenocrown ethers 3a,c and 4a,b were synthesized in a cyclization reaction of benzoin with oligoethylene glycol ditosylates (2a-c) under a phase-transfer condition.Extractions of aqueous alkali picrates (Na+-Cs+) were examined with the distilbenocrown ethers 4a,b, the partially-hydrogenated tetraphenylcrown ethers 6a,b, and the fully-hydrogenated tetracyclohexylcrown ethers 7a,b.

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