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128128-28-9

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128128-28-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 128128-28-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,1,2 and 8 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 128128-28:
(8*1)+(7*2)+(6*8)+(5*1)+(4*2)+(3*8)+(2*2)+(1*8)=119
119 % 10 = 9
So 128128-28-9 is a valid CAS Registry Number.

128128-28-9Downstream Products

128128-28-9Relevant articles and documents

Cycloisomerization of Carbamoyl Chlorides in Hexafluoroisopropanol: Stereoselective Synthesis of Chlorinated Methylene Oxindoles and Quinolinones

Bajohr, Jonathan,Lautens, Mark,Mirabi, Bijan,Rodríguez, José F.,Whyte, Andrew,Zhang, Anji

supporting information, p. 18478 - 18483 (2021/07/19)

Hexafluoroisopropanol (HFIP) was employed as an additive for the generation of 3-(chloromethylene)oxindoles via the chloroacylation of alkyne-tethered carbamoyl chlorides. This reaction avoids the use of a metal catalyst and accesses products in high yields and stereoselectivities. Additionally, this reaction is scalable and proved amenable to a series of product derivatizations, including the synthesis of nintedanib. The reactivity of alkene-tethered carbamoyl chlorides with hexafluoroisopropanol (HFIP) was harnessed towards the synthesis of 2-quinolinones.

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