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2157-18-8

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2157-18-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 2157-18-8 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,1,5 and 7 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 2157-18:
(6*2)+(5*1)+(4*5)+(3*7)+(2*1)+(1*8)=68
68 % 10 = 8
So 2157-18-8 is a valid CAS Registry Number.

2157-18-8Relevant articles and documents

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Bhalerao,U.T.,Rapoport,H.

, p. 4835 - 4840 (1971)

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METHOD FOR OXIDATIVE CLEAVAGE OF COMPOUNDS WITH UNSATURATED DOUBLE BOND

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Paragraph 0027-0029, (2021/07/10)

A method for oxidative cleavage of a compound with an unsaturated double bond is provided. The method includes the steps of: (A) providing a compound (I) with an unsaturated double bond, a trifluoromethyl-containing reagent, and a catalyst; wherein, the catalyst is represented by Formula (II): M(O)mL1yL2z??(II);wherein, M, L1, L2, m, y, z, R1, R2 and R3 are defined in the specification; and(B) mixing the compound with an unsaturated double bond and the trifluoromethyl-containing reagent to perform an oxidative cleavage of the compound with the unsaturated double bond by using the catalyst in air or under oxygen atmosphere condition to obtain a compound represented by Formula (III):

METHOD FOR OXIDATIVE CLEAVAGE OF COMPOUNDS WITH UNSATURATED DOUBLE BOND

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Paragraph 0024-0025; 0032, (2021/03/19)

A method for oxidative cleavage of a compound with an unsaturated double bond is provided. The method comprises the following step: (A) providing a compound (I) with an unsaturated double bond, a reagent with trifluoromethyl, and a catalyst; wherein the catalyst is represented by the following formula (II): M(O)mL1yL2z (II); wherein, M, L1, L2, m, y, z, R1, R2 and R3 are defined in the specification; and (B) mixing the compound with an unsaturated double bond and the reagent with a trifluoromethyl to perform an oxidation of the compound with the unsaturated double bond by using the catalyst at air or an oxygen condition to get a compound presented as formula (III):

Enantioselective synthesis of cyclobutenes by intermolecular [2+2] cycloaddition with non-c2 symmetric digold catalysts

García-Morales, Cristina,Ranieri, Beatrice,Escofet, Imma,López-Suarez, Laura,Obradors, Carla,Konovalov, Andrey I.,Echavarren, Antonio M.

supporting information, p. 13628 - 13631 (2017/11/06)

The enantioselective intermolecular gold-(I)-catalyzed [2+2] cycloaddition of terminal alkynes and alkenes has been achieved using non-C2-chiral Josiphos digold(I) complexes as catalysts, by the formation of the monocationic complex. This new approach has been applied to the enantioselective total synthesis of rumphellaone A.

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