Tri-o-tolyl Phosphate
Structural Formula Vector Image
Title: Tri-o-tolyl Phosphate
CAS Registry Number: 78-30-8
CAS Name: Phosphoric acid tris(2-methylphenyl) ester
Additional Names: tri-o-cresyl phosphate
Molecular Formula: C21H21O4P
Molecular Weight: 368.36
Percent Composition: C 68.47%, H 5.75%, O 17.37%, P 8.41%
Properties: Colorless or pale yellow liquid. Poisonous! mp 25.6°. bp ~410° with slight decompn. Flash pt 225°C. d 1.1955. n 1.5575. Sparingly sol in water, slightly sol in alcohol, sol in ether.
Melting point: mp 25.6°
Boiling point: bp ~410° with slight decompn
Flash point: Flash pt 225°C
Index of refraction: n 1.5575
Density: d 1.1955
CAUTION: Potential symptoms of overexposure are GI disturbance; peripheral neuropathy; cramps in calves, paresthesia in feet or hands; weak feet, wrist drop and paralysis. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 322. Ingestion may cause acute nausea, vomiting, diarrhea. Following a latent period, polyneuritis progressing to paralysis of extremities has been seen in severe poisoning. See Clinical Toxicology of Commercial Products, R. E. Gosselin et al., Eds. (Williams & Wilkins, Baltimore, 5th ed., 1984) Section III, pp 388-393; Patty's Industrial Hygiene and Toxicology vol. 2D, G. D. Clayton, F. E. Clayton, Eds. (John Wiley & Sons, New York, 4th ed., 1994) pp 3063-3085.
Use: As plasticizer in lacquers and varnishes.

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