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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
• Unstable when heated: Reaction products may be unstable above ambient temperatures
• Intense or explosive reaction: Reaction may be particularly intense, violent, or explosive

Solid diazonium tetrachloro- and tetrafluoroborates have decomposed vigorously at elevated temperature (1. Olah., G. A. et al., J. Org. Chem., 1961, 26, 2053, 2. Doak, G. O. et al., Chem. Eng. News, 1967, 45(53), 8). The explosive decomposition, known as the Balz-Shiemann reaction, was further documented by Kurti (Kurti, L.; Czako, B.; Balz-Schiemann Reaction. In Strategic Applications of Named Reactions in Organic Synthesis; Elsevier, 2005; pp 34-35). The presence of nitro groups can enhance decomposition of these materials (Pavlath, A. E. et al., Aromatic Fluorine Compounds, 15, New York, Reinhold, 1962.) Various combustion gases may be generated with these materials.

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)).

Potential Gas Byproducts

• Carbon Monoxide (CO)
• Carbon Dioxide (CO2)
• Halogenated Organics