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Ball Milling An efficient and ecologically friendly synthetic approach ‐‐‐ Jackie Ding . Ball milling – solvent free approach Appliion in organic synthesis Conclusion Content 2 . The 12 Principles of Green Chemistry Planetary Ball Mill PM 400 Feed material: soft, hard,

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Among different organoalysts used for asymmetric aldol reactions, proline and its derivatives emerged as powerful alysts for the enamine activation of donor aldehyde or ketone. Bolm''s group reported a solventfree asymmetric organoalytic aldol reaction under ballmilling conditions using Lproline (I) as alyst (Scheme 1) [29–30].

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Dec 02, 2014 · Among such alysts, lproline is the only known natural organoalyst it has been shown to alyze asymmetric aldol reactions (33 (2011) Efficient ballmill procedure in the ''green'' asymmetric aldol reaction organoalyzed by

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Efficient ballmill procedure in the ''green'' asymmetric

Sep 09, 2011 · Read "Efficient ballmill procedure in the ''green'' asymmetric aldol reaction organoalyzed by ( S )prolinecontaining dipeptides in the presence of water, Tetrahedron" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publiions available at your fingertips.

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Join LinkedIn Summary. I am a chemist with a passion for mechanochemistry, solidstate reactions and green chemistry. During the past 6 years I have been applying successfully mechanochemical

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Degree of efficiency depending on type of ball mill and reaction scale. High energy efficiency compared to synthesis with other methods of energy entry (classical as well as nonclassical) 6% 64% 94% 0% 25% 50% 75% 200 rpm 400 rpm 800 rpm chemical yield ball milling at different rot mortar + Figure 1 pestle Figure 2

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Drive Calculation For A Ball Mill Machine . Drive calculation for a ball mill, Working principle of ball mill This machine is a skeleton pattern ball mill TECHNICAL NOTES 8 GRINDING R. P. King Mineral Tech TECHNICAL NOTES 8 GRINDING R. P. King. for all frictional and mechanical losses in the drive system of the mill and can be balls in a ball

Efficient ball mill procedure in the green asymmetric

Efficient ballmill procedure in the ''green'' asymmetric aldol reaction The organoalytic activity of (S)prolinebased dipeptides 1a–c has been evaluated in the asymmetric aldol reaction between representative ketones with vari.

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Oct 11, 2015 · Rodriguez B, Bruckmann A, Bolm C.A Highly Efficient Asymmetric OrganoalyticAldol Reaction in a Ball Mill emEurJ2007 13: 47104722. Hernandez J G, Juaristi E. Efficient ballmill procedure in the ''green'' asymmetric aldol reaction organoalyzed by (S)prolinecontaining dipeptides in the presence of water. Tetrahedron2011 67: 69536959.

Solventfree asymmetric aldol reaction organoalyzed by

Jan 07, 2012 · An efficient, solventfree ballmilling protocol for the asymmetric aldol reaction between cyclohexanone and cyclopentanone with various aromatic aldehydes using a novel series of (S)prolinecontaining dipeptides and thiodipeptides 1a–f as organoalysts is reported general, (S)prolinecontaining thiodipeptides proved to be better organoalysts relative to their analogous amides.

Asymmetric Aldol Reaction Organoalyzed by (S)Proline

Jan 20, 2011 · Efficient ballmill procedure in the ''green'' asymmetric aldol reaction organoalyzed by (S)prolinecontaining dipeptides in the presence of water. Tetrahedron 2011, 67, 69536959. DOI: 10.1016/j.tet.2011.06.042. Jose G. Hernandez, Eusebio Juaristi.

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Benzoic acid and ophenylenediamine efficiently reacted under the green solventfree Ball Milling method. Several reaction parameters were investigated such as rotation frequency milling balls weight and milling time. The optimum reaction condition was milling with 56.6 g weight of balls at 20 Hz frequency for one hour milling time. The .

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In this video the authors present asymmetric organoalyses performed in a ball mill. Three reaction types are being discussed: enantioselective aldol reactions, asymmetric Michael additions to nitro alkenes and dipeptide formations. In the laboratory the ball milling device is shown, and reaction

Ball Milling for organic synthesis: A tool for process

Degree of efficiency depending on type of ball mill and reaction scale. High energy efficiency compared to synthesis with other methods of energy entry (classical as well as nonclassical) 6% 64% 94% 0% 25% 50% 75% 200 rpm 400 rpm 800 rpm chemical yield ball milling at different rot mortar + Figure 1 pestle Figure 2

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Efficient ballmill procedure in the ''green'' asymmetric aldol reaction organoalyzed by (S)prolinecontaining dipeptides in the presence of water. Tetrahedron 2011, DOI: 10.1016/j.tet.2011.06.042.

Efficient ball mill procedure in the green asymmetric

Efficient ballmill procedure in the ''green'' asymmetric aldol reaction The organoalytic activity of (S)prolinebased dipeptides 1a–c has been evaluated in the asymmetric aldol reaction between representative ketones with vari.

efficient ball mill procedure in the green asymmetric

Natural lowmolecular mass organic compounds with oxidase Dec 02, 2014· Hernández JG, Juaristi E. Efficient ballmill procedure in the ''green'' asymmetric aldol reaction organoalyzed by (S)prolinecontaining dipeptides in the presence of water.

Ball Milling University of Massachusetts Boston

Ball Milling An efficient and ecologically friendly synthetic approach ‐‐‐ Jackie Ding . Ball milling – solvent free approach Appliion in organic synthesis Conclusion Content 2 . The 12 Principles of Green Chemistry Planetary Ball Mill PM 400 Feed material: soft, hard,

Solventfree asymmetric aldol reaction organoalyzed by

Jan 07, 2012 · An efficient, solventfree ballmilling protocol for the asymmetric aldol reaction between cyclohexanone and cyclopentanone with various aromatic aldehydes using a novel series of (S)prolinecontaining dipeptides and thiodipeptides 1a–f as organoalysts is reported general, (S)prolinecontaining thiodipeptides proved to be better organoalysts relative to their analogous amides.

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In this video the authors present asymmetric organoalyses performed in a ball mill. Three reaction types are being discussed: enantioselective aldol reactions, asymmetric Michael additions to nitro alkenes and dipeptide formations. In the laboratory the ball milling device is shown, and reaction

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Benzoic acid and ophenylenediamine efficiently reacted under the green solventfree Ball Milling method. Several reaction parameters were investigated such as rotation frequency milling balls weight and milling time. The optimum reaction condition was milling with 56.6 g weight of balls at 20 Hz frequency for one hour milling time. The .

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Efficient ballmill procedure in the ''green'' asymmetric

The organoalytic activity of (S)prolinebased dipeptides 1a–c has been evaluated in the asymmetric aldol reaction between representative ketones with various aromatic aldehydes under solventfree conditions in a ball mill particular, the methyl ester of (S)proline(S)tryptophan, (S,S)1c, proved to be an efficient organoalyst, and the aldol reaction proceeded with good chemical

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Aldol reaction Publiions PubFacts

The first enantioselective total synthesis of the proposed structure of NFAT133 [(10 R,11 R,12 S)1] and its C10 epimer [(10 S,11 R,12 S)1] was achieved from a known aromatic ester (5) by a 10step sequence that featured chiral auxiliarydirected asymmetric alkylation and the Evans asymmetric aldol reaction as the chiralityinducing steps.

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A highly efficient asymmetric organoalytic aldol reaction in a ball Rodríguez B(1) Efficient mixing of all the components is accomplished by applying a mechanochemical technique (ball milling). The alysis is air and moisture tolerant and can be performed with nonpurified starting materials.

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