# Which component acts as the electrophile in the synthesis of the Sudan-1 azo dye?

In the two-pot synthesis, which acts as the nucleophile, 2-naphthol or phenyldiazonium?

Solomons et al. (2014) says that phenyldiazoium is weakly electrophilic. Yet in the questions to be answered in our laboratory manual, it asks for resonance structures on the attack of phenyldiazonium on carbon 1 and carbon 3 of beta-naphthol. I'm confused. I can't seem to find a mechanism wherein phenyldiazonium acts as a nucleophile in the internet or in my books.

• Maybe you can draw a mechanism yourself and add it to your question? If you're looking for a free molecule editor: I'm using BKChem for my posts on Chem.SE. – Klaus-Dieter Warzecha Oct 31 '16 at 18:17
• Even though arrows are always drawn to represent nucleophilic attack, the word "attack" can in general refer to electrophilic attack as well, so there might not be any real contradiction here. – orthocresol Oct 31 '16 at 18:25
• Following up on @orthocresol's comment, we typically learn the term 'attack' with respect to nucleophiles (e.g., in SN2 reaction), but 'attack' can be used for electrophiles as well. – jerepierre Oct 31 '16 at 18:28
• Some pedantry: your second arrow should really be a $\ce{<->}$, not a $\ce{<=>}$. Those are two resonance forms of naphthol which are not being rapidly interconverted. – orthocresol Oct 31 '16 at 18:47