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21854-76-2

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21854-76-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21854-76-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,8,5 and 4 respectively; the second part has 2 digits, 7 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 21854-76:
(7*2)+(6*1)+(5*8)+(4*5)+(3*4)+(2*7)+(1*6)=112
112 % 10 = 2
So 21854-76-2 is a valid CAS Registry Number.

21854-76-2Relevant articles and documents

Mannich-type reaction promoted by an ionic liquid

Akiyama, Takahiko,Suzuki, Akihiro,Fuchibe, Kohei

, p. 1024 - 1026 (2005)

The Mannich-type reaction of silyl enolates with aldimines occurred smoothly with [emim]OTf as a solvent and without the addition of an activator to afford β-amino carbonyl compounds in excellent yields.

Bronsted acid-surfactant-combined catalyst for the Mannich reaction in water

Chang, Tao,He, Leqin,Bian, Li,Han, Haiyan,Yuan, Mingxia,Gao, Xiaorui

, p. 727 - 731 (2014/01/06)

A series of Bronsted acid-surfactant-combined catalysts (BASCs) functionalised with different acids have been synthesized and applied to catalyze the three-component Mannich reaction with aldehyde, acetone and amine at 25 °C in water. The effects of cation tail length and ions of the ionic liquid and the recyclability of the catalysts and BASC acidity (H0) were investigated. The results demonstrated that the 3-(N,N- dimethyloctylammonium) propanesulfonic acid toluene sulfate ([DOPA][Tos]) provide the best catalytic activity because of the formation of emulsions during the reaction. The catalytic procedure was simple and the catalyst could be recycled 9 times by simple separating processes without noticeably decreasing the catalytic activity. The Royal Society of Chemistry 2014.

Heteropoly acid in ionic liquid - An efficient and recyclable system for one-pot three-component Mannich reaction

Rasalkar, Maghana S.,Bhilare, Sachin V.,Deorukhkar, Amol R.,Darvatkar, Nitin B.,Salunkhe, Manikrao M.

, p. 77 - 80 (2008/02/04)

This paper describes a one-pot three-component Mannich reaction, catalyzed by phosphotungstic acid (H3PW12O40), a heteropoly acid in ionic liquid. The catalyst was found to be mild and efficient, and the protocol affords β-arnino ketones in good yields under ambient conditions. Several ionic liquids and conventional organic solvents were employed for the reaction. The ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim]BF4) offered the best results in terms of yield of the products. It was observed that a Homogeneous reaction medium proved beneficial for the yield of the reaction.

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