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20894-11-5

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20894-11-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 20894-11-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,8,9 and 4 respectively; the second part has 2 digits, 1 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 20894-11:
(7*2)+(6*0)+(5*8)+(4*9)+(3*4)+(2*1)+(1*1)=105
105 % 10 = 5
So 20894-11-5 is a valid CAS Registry Number.

20894-11-5Relevant articles and documents

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Fishman,Zuffanti

, p. 4466 (1951)

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Synthesis of new chiral macrocycles-based glycolipids and its application in asymmetric Michael addition

Sabah, Karem J.,Zahid, N. Idayu,Hashim, Rauzah

, p. 2653 - 2667 (2021/03/19)

A series of new mix aza- and thia-macrocyclic glycolipids (9, 10, 16 and 17) have been synthesized and their enantiomeric selectivity was studied. The synthesis of the macrocycles involved a simple protection of two hydroxyl groups of the glycolipids followed by building up the mix-heteroatom macrocyclic in simple sequences. The macrocycles and previously investigated analogues (18, 19, 20 and 21) have been applied as phase transfer catalysts in the enantioselective Michael addition of 2-nitropropane to chalcone and showed good-to-excellent enantiomer excess (ee). Among the catalysts, the galactose aza-crown ether-based glycolipid 21 proved to be the most effective with 90% ee. Graphic abstract: [Figure not available: see fulltext.]

Epi-cinchona based thiourea organocatalyst family as an efficient asymmetric Michael addition promoter: Enantioselective conjugate addition of nitroalkanes to chalcones and α,β-unsaturated N-acylpyrroles

Vakulya, Benedek,Varga, Szilard,Soos, Tibor

, p. 3475 - 3480 (2008/09/20)

(Chemical Equation Presented) A small set of easily available epi-cinchona based thiourea organocatalysts have been synthesized and tested in enantioselective Michael addition of nitroalkanes to chalcones. These bifunctional catalyst systems promoted the

Henry reaction and 1,4-addition of nitroalkanes to α,β- unsaturated carbonyl compounds under the influence of MS 4 A in DMSO

Oriyama, Takeshi,Aoyagi, Masaru,Iwanami, Katsuyuki

, p. 612 - 613 (2008/02/07)

In the presence of MS 4 A in DMSO (dimethyl sulfoxide), Henry reaction with various carbonyl compounds and nitroalkanes proceeded smoothly to give the corresponding β-nitroalcohol without a base catalyst. Moreover, 1,4-additon of nitroalkane to α,β-unsaturated ketones was also performed in DMSO. Copyright

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