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2 article(s) from Michalchuk, Adam A L

Understanding the unexpected effect of frequency on the kinetics of a covalent reaction under ball-milling conditions

Ana M. Belenguer,
Adam A. L. Michalchuk,
Giulio I. Lampronti and
Jeremy K. M. Sanders

Beilstein J. Org. Chem. 2019, 15, 1226–1235, doi:10.3762/bjoc.15.120

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Scheme 1: Solid-state exchange reaction through ball-mill grinding under neat ball-mill-grinding conditions (...

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Figure 1: Solid-state studies reacting 1-1 and 2-2 in an equimolar ratio in the presence of DBU as catalyst t...

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Scheme 2: Schematic representation of a solid + solid mechanochemical reaction. Subscript denote macroscopic ...

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Scheme 3: Simplified reaction equation for the mechanochemical transformation. Note that [AB] is a physical c...

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Figure 2: Reaction profiles for mechanochemical milling according to Equation 4. (a) Kinetic profiles for 30 Hz, 25 Hz,...

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Figure 3: Modelled kinetic profiles for 15 Hz neat milling, with variation in the magnitude of the mixing ter...

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Figure 4: Reaction profiles for LAG mechanochemical milling according to Equation 4. The modelled curves are given for ...

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Published 05 Jun 2019

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Unexpected polymorphism during a catalyzed mechanochemical Knoevenagel condensation

Sebastian Haferkamp,
Andrea Paul,
Adam A. L. Michalchuk and
Franziska Emmerling

Beilstein J. Org. Chem. 2019, 15, 1141–1148, doi:10.3762/bjoc.15.110

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Scheme 1: Catalyzed mechanochemical Knoevenagel condensation of fluorobenzaldehydes and malonodinitrile. The ...

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Figure 1: Comparison of XRPD pattern of malonodinitrile (2) and (p-fluorobenzylidene) malonodinitrile (3a). T...

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Figure 2: a) XRPD pattern of (p-fluorobenzylidene)malonodinitrile (3a) direct after the synthesis with differ...

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Figure 3: Mass spectra of the different products of 3a. Red: peak off the molecular ion [M + H]⁺ of piperidin...

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Figure 4: a) In situ XRPD pattern of the mechanochemical Knoevenagel condensation of 1a and 2 with 2 µL catal...

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Figure 5: Comparison of XRPD patterns of both polymorphs of the product 3a. Red: triclinic polymorph t3a. Blu...

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Figure 6: Results of multivariate data analysis of Raman spectra for 30 Hz milling experiments. Principal com...

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Published 21 May 2019

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