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Hazard Predictions

• Explosive: Reaction products may be explosive or sensitive to shock or friction
• Generates gas: Reaction liberates gaseous products and may cause pressurization
• Generates heat: Exothermic reaction at ambient temperatures (releases heat)
• Unstable when heated: Reaction products may be unstable above ambient temperatures
• Intense or explosive reaction: Reaction may be particularly intense, violent, or explosive

Diazonium tetrafluoroborates can decompose violently during drying or elevated temperature operations (Kurti, L.; Czako, B.; Balz-Schiemann Reaction. In Strategic Applications of Named Reactions in Organic Synthesis; Elsevier, 2005; pp 34-35). This reaction is known as the Balz-Schiemann reaction.

Large volumes of gas are generated when making fluorobenzene from benzenediazonium fluoborate (Organic Syntheses, Coll. Vol. 2, p.295 (1943); Vol. 13, p.46 (1933)).