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107-49-3

107-49-3 structural image
Product Name: TEPP
Formula: C8H20O7P2
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CHEMICAL AND PHYSICAL PROPERTIES

Physical Description Tetraethyl pyrophosphate is an organic phosphate pesticide which acts as an inhibitor of cholinesterase, and as such it is highly toxic by all routes of exposure. It is a water-white to amber liquid, depending on purity. Tetraethyl pyrophosphate is soluble in water and is slowly decomposed by water. It is toxic by inhalation and by skin absorption. It may be found as a liquid or as a dry mixture where the liquid is absorbed onto a dry carrier.
Color/Form Mobile liquid
Odor Agreeable odor
Boiling Point 280 °F at 2.3 mmHg (EPA, 1998)
Melting Point 32 °F (EPA, 1998)
Flash Point >110 °C c.c.
Solubility Miscible (decomposes) (NTP, 1992)
Density 1.185 at 68 °F (EPA, 1998) - Denser than water; will sink
Vapor Density Relative vapor density (air = 1): 10
Vapor Pressure 0.00047 mmHg at 86 °F (EPA, 1998)
LogP 2.94
Henry's Law Constant Henry's Law constant = 2.2X10-10 atm-cu m/mol at 25 °C /Estimated/
Stability/Shelf Life Quickly hydrolyzed by water (half-life at 25 °C about 7 hr in a 50% vol/vol mixt).
Decomposition When heated to decomposition it emits highly toxic fumes of /phosphorus oxides/.
Corrosivity TEPP will attack some forms of plastics, rubber, and coatings.
Refractive Index Index of refraction: 1.4196 @ 20 deg C/D
Kovats Retention Index 1549.9 1579.2
Other Experimental Properties Hygroscopic
Chemical Classes Pesticides -> Organophosphate Insecticides

COMPUTED DESCRIPTORS

Molecular Weight 290.19 g/mol
XLogP3 0.4
Hydrogen Bond Donor Count 0
Hydrogen Bond Acceptor Count 7
Rotatable Bond Count 10
Exact Mass 290.06842697 g/mol
Monoisotopic Mass 290.06842697 g/mol
Topological Polar Surface Area 80.3 Ų
Heavy Atom Count 17
Formal Charge 0
Complexity 246
Isotope Atom Count 0
Defined Atom Stereocenter Count 0
Undefined Atom Stereocenter Count 0
Defined Bond Stereocenter Count 0
Undefined Bond Stereocenter Count 0
Covalently-Bonded Unit Count 1
Compound Is Canonicalized Yes

PRODUCT INTRODUCTION

description

Tetraethyl pyrophosphate is an organic phosphate pesticide which acts as an inhibitor of cholinesterase, and as such it is highly toxic by all routes of exposure. It is a water-white to amber liquid, depending on purity. Tetraethyl pyrophosphate is soluble in water and is slowly decomposed by water. It is toxic by inhalation and by skin absorption. It may be found as a liquid or as a dry mixture where the liquid is absorbed onto a dry carrier.