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28151-59-9

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28151-59-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 28151-59-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,8,1,5 and 1 respectively; the second part has 2 digits, 5 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 28151-59:
(7*2)+(6*8)+(5*1)+(4*5)+(3*1)+(2*5)+(1*9)=109
109 % 10 = 9
So 28151-59-9 is a valid CAS Registry Number.

28151-59-9Relevant articles and documents

A novel method for the construction of a benzene ring: A facile ring-closing reaction of (1E,3E,5E)-1-chloro-3-(p-tolylsulfonyl)-1,3,5-alkatrienes

Ogura, Katsuyuki,Takeda, Mineko,Xie, Jian R.,Akazome, Motohiro,Matsumoto, Shoji

, p. 1923 - 1925 (2007/10/03)

(1E,3E,5E)-1-Chloro-3-(p-tolylsulfonyl)-1,3,5-alkatrienes (1) underwent facile ring-closure followed by spontaneous removal of hydrogen chloride to form a benzene ring. This reaction sequence occurred at relatively low temperature.

"Syn-Effect" in the Conversion of (E)-Vinylic Sulfones to the Corresponding Allylic Sulfones

Hirata, Takaki,Sasada, Yoshihiro,Ohtani, Takashi,Asada, Takahiro,Kinoshita, Hideki,et al.

, p. 75 - 96 (2007/10/02)

It was found that (E)-vinylic sulfones preferentially afford (Z)-allylic sulfones as kinetically-controlled products by treatment with a base under mild conditions, while (Z)-vinylic sulfones give (E)-allylic sulfones.Such stereochemical relationship was

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