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57711-28-1

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57711-28-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 57711-28-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,7,1 and 1 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 57711-28:
(7*5)+(6*7)+(5*7)+(4*1)+(3*1)+(2*2)+(1*8)=131
131 % 10 = 1
So 57711-28-1 is a valid CAS Registry Number.

57711-28-1Relevant articles and documents

Enantioselective intermolecular all-carbon [4+2] annulation: Via N-heterocyclic carbene organocatalysis

Zhang, Guoxiang,Xu, Weici,Liu, Jian,Das, Deb Kumar,Yang, Shuang,Perveen, Saima,Zhang, Hao,Li, Xinglong,Fang, Xinqiang

supporting information, p. 13336 - 13339 (2017/12/26)

The highly stereoselective intermolecular all-carbon [4+2] annulation between in situ generated acyclic dienolates and α,β-unsaturated acyl azoliums is disclosed. The identification of 2-acyloxy-3-butenones as suitable diene precursors is the key to the s

Rearrangement of 1-Aryl-2,2-dihalo-1-alkanones

Kimpe, Norbert De,Verhe, Roland,Buyck, Laurent De,Schamp, Niceas

, p. 2803 - 2813 (2007/10/02)

Reaction of 1-aryl-2,2-dichloro-1-alkanones with alkoxides in the corresponding alcohol afforded a mixture of 1-aryl-2,2-dialkoxy-1-alkanones and 1-aryl-1,1-dialkoxy-2-alkanones.The mechanism was shown to proceed via α-chloro-α'-alkoxy epoxides, which rearranged into 1-alkoxy-1-aryl-1-chloro-2-alkanones, the latter giving the final compounds via either another epoxide intermediate or a solvolysis mechanism. α,α-Dibromo- and α-bromo-α-chloroalkyl aryl ketones behaved analogously, but α-bromo-α-fluoro- and α-chloro-α-fluoroalkyl aryl ketones gave exclusively solvolysis of initially formed 1-alkoxy-1-aryl-1-fluoro-2-alkanones, resulting in rearranged 1-aryl-1,1-dialkoxy-2-alkanones. α,α-Difluoroalkyl aryl ketones did not rearrange but underwent reduction of the carbonyl function on treatment with sodium methoxide in methanol.The influence of varying factors, such as the steric requirements of the alkoxide and the substrate, the concentration of the alkoxide, the aromatic substituent, the temperature, and the halogens, was investigated and correlated to the mechanism involved.

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