Chemists still write in this way when writing mechanisms. Here's a typical example: https://en.wikipedia.org/wiki/Reaction_mechanism#/media/File:Benzoin_condens

Chemists still write in this way when writing mechanisms. Here's a typical example: https://en.wikipedia.org/wiki/Reaction_mechanism#/media/File:Benzoin_condensation2.svg https://en.wikipedia.org/wiki/Reaction_mechanism#/media/File...