One possibility is to employ diazonium tetrafluoroborates in arene solvent together with a phase-transfer catalyst, another is to use 1-aryl-3,3-dialkyltriazenes.
The passage presents two distinct methods for achieving a specific chemical reaction: using diazonium tetrafluoroborates and a phase-transfer catalyst in an arene solvent or employing 1-aryl-3,3-dialkyltriazenes.