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31889-28-8

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31889-28-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 31889-28-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,8,8 and 9 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 31889-28:
(7*3)+(6*1)+(5*8)+(4*8)+(3*9)+(2*2)+(1*8)=138
138 % 10 = 8
So 31889-28-8 is a valid CAS Registry Number.

31889-28-8Relevant articles and documents

Tf2O-Mediated Intermolecular Coupling of Secondary Amides with Enamines or Ketones: A Versatile and Direct Access to β-Enaminones

Liu, Yong-Peng,Zhu, Cheng-Jie,Yu, Cun-Cun,Wang, Ai-E,Huang, Pei-Qiang

, p. 7169 - 7174 (2019)

Based on the Tf2O-mediated intermolecular reaction of secondary amides with enamines derived from ketones, a novel approach to β-enaminones has been developed. The reaction is widely functional group tolerant and highly chemoselective. In the presence of 4 ? molecular sieves, the method can be extended to the one-pot condensation of secondary amides with ketones for NH β-enaminones synthesis.

178. Stereoselectivity of the Radical Reductive Alkylation of Enamines: Importance of the Allylic 1,3-Strain Model

Schubert, Serge,Renaud, Philippe,Carrupt, Pierre-Alain,Schenk, Kurt

, p. 2473 - 2489 (2007/10/02)

Radical addition to enamines using Bu3SnH as reducing agent are reported (Schemes 2 and 4).The diastereoselectivity of these reactions was examined in different systems (Tables 1 and 2).Enamines derived from cyclic ketones such as cyclohexanone were alkyl

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