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25139-78-0

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25139-78-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 25139-78-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,5,1,3 and 9 respectively; the second part has 2 digits, 7 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 25139-78:
(7*2)+(6*5)+(5*1)+(4*3)+(3*9)+(2*7)+(1*8)=110
110 % 10 = 0
So 25139-78-0 is a valid CAS Registry Number.

25139-78-0Downstream Products

25139-78-0Relevant articles and documents

Stereochemistry of Friedel-Crafts Reaction of Benzene with Optically Active 2-Methyloxetane

Segi, Masahito,Takebe, Masaki,Masuda, Shinji,Nakajima, Tadashi,Suga, Sohei

, p. 167 - 170 (1982)

The Friedel-Crafts alkylation of benzene with (+)-2-methyloxetane in the presence of Lewis acids (AlCl3, SnCl4, and TiCl4) gave 3-phenyl-1-butanol with 20-60percent inversion of configuration at the reaction center and a mixture of 4-chloro-2-butanol and 3-chloro-1-butanol in optically active form as the by-products. These by-products were formed by the attack of the chlorine atom in Lewis acid. The stereochemical course of the reaction to 3-chloro-1-butanol varied with the kind of catalyst, i.e., inversion with AlCl3 or TiCl4 and retention with SnCl4. The addition of nitromethane to the reaction system promoted the retentive ring-opening to 3-chloro-1-butanol.

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