Interest in photochemistry has been growing exponentially in recent years. Numerous new applications using visible-light photoredox catalysis have been discovered. These catalytic systems can perform many types of bond formations using various substrates which are valuable new tools for synthetic chemists.
Current Photochemical Setup
However photoredox chemistry or photochemistry setup necessitates to the use of a light source (blue light) and apparatus that are not standard yet in an organic chemistry laboratory. Many chemists have made their own setup and tried to reproduce literature chemistry with more or less success. As a result the implementation of photoredox chemistry is slow and organic chemists are still hesitant to try these important new tools. Therefore, the need for a simple and robust device to perform visible-light photoredox catalysis has become increasingly important.
EvoluChem™ Photochemical Reactor
The EvoluChem™ PhotoRedOx Box was designed with one main objective: To allow any chemist to easily perform multiple photochemical reactions in a reproducible environment. Our photochemical reactor provides an even light distribution to all reaction samples allowing consistent and reproducible reactions. A cooling fan allows even temperature distribution and keeps the chamber near room temperature during long reaction runs. The device easily fits on standard stir plates, allowing for consistent stirring. Sample holders are compatible with vials ranging from 0.3 ml to 20 ml vials.
The PhotoRedOx Box is using a unique geometry of mirrors to irradiate multiple samples simultaneously for parallel chemistry setup while limiting the thermal effect of the light source. This design results into a compact and efficient photochemical reactor which can be easily set on any standard stir plate.
The removable lamp adapter allows easy switching from the standard kessil™ blue 34W LED lamp to many other light sources provided by HepatoChem.
Fit multiple vial formats
Organic chemists needs to be able to use different reaction vial sizes depending on the scale and the number of the reaction to be performed. The PhotoRedox Box can virtually fit any type of vials including 0.3ml crimped vials (6 x 32mm), 2ml HPLC vials (12 x 32mm), 1DRAM (15 x 45mm), Microwave vial 2-5mL (17 x 83mm), 2DRAM (17 x 60mm) and 20ml scintillation vials (28 x 61mm). This feature allows quick and consistent scale up from screen reactions to larger scale with preset sample positions removing the guess work on sample placement distance from the light source. When using 0.3 ml vials, 32 reactions can be performed in parallel in the photochemical reactor. At 20 ml, two reactions can be run in duplicate.
With the EvoluChem photomethylation kit, we have demonstrated the reproducibility of both the photomethylation kit and the device. Using a photomethylation of buspirone as test reaction, 16 vials spread through the 0.3 ml vial sample holder for Trial #1 results in 53% (+/-2 %) conversion. See figure. For a second trial with 16 reaction vials we observed an average conversion of 56% (+/-2 %) for the mono-methylated product.
Test reaction (Methylation)
Percentage of mono-methylation product
by reaction vial position reproducibility_photomethylation
Average- 53% +/-2%
Each reaction vial contains Ir(dF-CF3-ppy)2(dtbpy)[PF6] (0.1 µmol), tert-butylperacetate solution (12.5 µmol) and a stir bar sealed under inert atmosphere. To each vial was added 50 µl of 0.05 M buspirone solution in 1:1 trifluoroacetic acid/acetonitrile sparged with nitrogen stream. Reaction mixture irradiated with EvoluChem LED 450nm HCK1012-01-002 for 18 hr using EvoluChem photochemical reactor.