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Pyrylium salts- kryptonite for the Sandmeyer reaction?

I often stumble across interesting chemistry when I peruse my twitter feed. It’s not only rich in new chemistry highlights and ASAP links to journal articles but also chemists sharing their own experiences with both new and existing methodology- good, bad, and sometimes with pictures!- a dimension missing from just reading peer-reviewed journal articles and,

A radical approach to C-H chlorination

My first experiences of radical chlorination where something of a baptism of fire. Generation of chlorine radicals from chlorine gas under intense UV irradiation in a custom-made photochemical flow reactor was as scary as it sounds to a very young, yet to be trained chemistry technician starting out in his carrier in the chemical industry.

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