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192987-90-9

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192987-90-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 192987-90-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,2,9,8 and 7 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 192987-90:
(8*1)+(7*9)+(6*2)+(5*9)+(4*8)+(3*7)+(2*9)+(1*0)=199
199 % 10 = 9
So 192987-90-9 is a valid CAS Registry Number.

192987-90-9Relevant articles and documents

Autotandem Catalysis: Inexpensive and Green Access to Functionalized Ketones by Intermolecular Iron-Catalyzed Amidoalkynylation/Hydration Cascade Reaction via N-Acyliminium Ion Chemistry

Abdallahi, Sidi Mohamed,Ewies, Ewies F.,El-Shazly, Mohamed,Ould Elemine, Brahim,Hadou, Abderrahmane,Moncol, Ján,Lawson, Ata Martin,Daich, Adam,Othman, Mohamed

supporting information, p. 15440 - 15449 (2021/10/07)

Iron-based catalysts were applied in cascade-type reactions for the synthesis of different carbonyl compounds. The reactions proceeded by a new iron-catalyzed cascade of alkynylation/hydration by using both the σ- and π-Lewis acid properties of iron salts. The alkynylation reactions of several endo and exocyclic acetoxylactams were achieved with three different catalysts including FeCl3 ? 6H2O, FeCl3, and Fe(OTf)3 showing the efficiency of σ-Lewis acidity of iron (III) salts in catalyzing the alkynylation reaction. We also demonstrated that the reaction sequence could be shortened by the direct use of hydroxylactams, leading to an environmentally friendly protocol, avoiding the need to perform unnecessary lengthy steps. A combination of the hard/soft iron Lewis acid properties was then used to implement an unprecedented tandem intermolecular alkynylation/intramolecular hydration sequence allowing expedient access to a new carbonyl structures from trivial materials.

Diastereoselective borono-Mannich reactions on cyclic N-acyliminium ions

Morgan, Ian R.,Yazici, Arife,Pyne, Stephen G.

, p. 1409 - 1419 (2008/09/20)

The addition of boronic acids to five- and six-membered ring N-acyliminium ions has been employed to prepare 5- and 6-substituted 4-hydroxypyrrolidin-2-ones and 5-hydroxypiperidin-2-ones, respectively, in a diastereoselective fashion. Crown Copyright

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