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Hazard Predictions

• Flammable: Reaction products may be flammable
• Generates gas: Reaction liberates gaseous products and may cause pressurization
• Intense or explosive reaction: Reaction may be particularly intense, violent, or explosive
• Polymerization hazard: Polymerization reaction may become intense and may cause pressurization
• Toxic: Reaction products may be toxic

Acetaldehyde can react with AlCl3 in CCl4 to produce highly toxic phosgene gas (Illari, G. 1951. Gazz. Chim. (Ital.) 81:439; Chemical Abstracts, Columbus: American Chemical Society, 46:5532.).

BrF3 ignites or explodes on contact with most organic compounds, including aldehydes (Mellor, J.W. 1941. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Vol. 2, p. 113. Longmans, Green and Co Ltd.; 1956. Volume 2, Supplemental 1. pp. 164-167.).

AlCl3 or BF3 promotes polymerization of acetaldehyde, even at low temperatures (Fleischmann, G., R. Jira. 2002. Acetaldehyde. In Ullmann's Encyclopedia of Industrial Chemistry. Wiley-VCH Verlag GmbH & Co. KGaA. (Online)).

Benzaldehyde can be readily chlorinated, producing water-reactive benzoyl chloride (Fleischmann, G., R. Jira. 2002. Acetaldehyde. Ullmann's Encyclopedia of Industrial Chemistry. Wiley-VCH Verlag GmbH & Co. KGaA. (Online)), which is also toxic (Lewis, R.J. Hawley's Condensed Chemical Dictionary, 13th edition. New York: Van Nostrand Reinhold. pp. 128.).

Aldehydes may generate highly toxic and flammable COF2 gas upon exposure to halogenated organics or other halogenating agents (Predicted).

In direct sunlight or with slight warming, paraformaldehyde and chlorine gas react to form highly toxic phosgene, toxic and flammable carbon monoxide, and toxic HCl gases (Walker, F. J., Formaldehyde. New York: ACS Monograph Series, 1964, pp. 257). Other halogens react less readily: bromine gives CO2 and Iodine will only react at temperatures over 120C to liberate CO and HI (Ibid).

Potential Gas Byproducts

• Phosgene (COCl2)
• Acid Halide (X2CO)