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128721-40-4

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128721-40-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 128721-40-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,7,2 and 1 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 128721-40:
(8*1)+(7*2)+(6*8)+(5*7)+(4*2)+(3*1)+(2*4)+(1*0)=124
124 % 10 = 4
So 128721-40-4 is a valid CAS Registry Number.

128721-40-4Relevant articles and documents

Triflic acid controlled successive annelation of aromatic sulfonamides: an efficient one-pot synthesis of N-sulfonyl pyrroles, indoles and carbazoles

Abid, Mohammed,Teixeira, Liliana,T?r?k, Béla

, p. 4047 - 4050 (2007)

A novel one-pot synthesis of N-substituted heterocycles via successive cyclization/annelation starting from primary sulfonamides is described. This process directly leads to N-sulfonyl pyrroles, indoles and carbazoles. The selection of an appropriate reac

Electron Transfer Photoredox Catalysis: Development of a Photoactivated Reductive Desulfonylation of an Aza-Heteroaromatic Ring

Qiang-Liu,Liu, Yu-Xiu,Song, Hong-Jian,Wang, Qing-Min

supporting information, p. 3110 - 3115 (2020/07/04)

Herein, we report a protocol for desulfonylation of aza-heteroaromatic rings via photoinduced electron transfer and hydrogen atom transfer. This general protocol has a wide substrate range and moderate to good yields. The utility of the method was demonstrated by the chemoselective desulfonylation of a molecule containing both an aliphatic and an aromatic sulfonamide. (Figure presented.).

N - substituted benzene sulfonyl -3 - propionyl indole derivatives, preparation method and application

-

Paragraph 0203-0207, (2018/07/30)

The invention discloses an N-substituted benzenesulfonyl-3-propionyl indole derivative, a preparation method and application and belongs to the technical field of organic synthesis. The structural formula of the N-substituted benzenesulfonyl-3-propionyl i

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