In December 2017 the United Nations proclaimed that 2019 will be international year of the Periodic Table of the Chemical Elements. This coincides with the 150th anniversary of the periodic system discovered by Dmitry Mendeleev in 1869. We at Scientific Update love a good celebration so over the coming months, and in honour of this
Month: October 2018
Syntactic fantastic: A practical, ortho- selective mono-halogenation and phenylselenation of phenols by direct C-H halogenation.
The direct halogenation of phenols using electrophilic halogenating reagents such as NBS are frequently used to prepare halogenated phenols. The problem with this method is that selectivity can often be low- the ortho– isomer is usually the minor component in a statistical mixture due to steric and electronic effects, and over reaction to give polyhalogenated