''tert''-Butyl chromate

tert-Butyl chromate
Names
IUPAC name
tert-Butyl chromate
Other names
Di-tert-butyl ester of chromic acid; Bis(tert-butyl)chromate
Identifiers
3D model (JSmol)
ChemSpider
RTECS number GB2900000
Properties
[(CH3)3CO]2CrO2
Molar mass 230.3 g/mol[1]
Appearance red oil
Melting point −2.8 °C (27.0 °F; 270.3 K) [2]
Miscible[2]
Hazards
US health exposure limits (NIOSH):
PEL (Permissible)
 TWA 0.005 mg CrO3/m3 [skin][1]
REL (Recommended)
 Ca TWA 0.001 mg Cr(VI)/m3[1]
IDLH (Immediate danger)
 Ca [15 mg/m3 {as Cr(VI)}][1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

tert-Butyl chromate is an industrial chemical and carcinogen. It is prepared by treatment of t-butanol with chromic anhydride. It forms red crystals at temperatures below –5 °C, above which it melts to give a red oil.[3]

Applications

It is used as an organic source of chromium, in making catalysts and as an oxidant in organic synthesis, and as a curing agent for urethane foams.[4]

Safety

tert-Butyl chromate reacts strongly with reducing agents, moisture, acids, alcohols, hydrazine, and other combustible materials. tert-Butyl chromate is itself flammable. It is designated a potential occupational carcinogen by the United States National Institute for Occupational Safety and Health, as it may cause lung cancer. Symptoms of exposure to tert-butyl chromate can include eye, skin, and respiratory irritation; eye and skin burns; drowsiness, muscle weakness; skin ulcers; nausea; vomiting; diarrhea; dyspnea; and cough.[1][2]

References

  1. 1 2 3 4 5 "NIOSH Pocket Guide to Chemical Hazards #0080". National Institute for Occupational Safety and Health (NIOSH).
  2. 1 2 3 "Tert-butyl chromate". International Chemical Safety Cards. NIOSH. July 1, 2014.
  3. ↑ Freeman, Fillmore (2001-04-15), "Di-tert-butyl Chromate", Encyclopedia of Reagents for Organic Synthesis, John Wiley & Sons, Ltd, doi:10.1002/047084289x.rd059m, ISBN 0471936235, retrieved 2018-07-15
  4. ↑ "Hazardous Substance Fact Sheet" (PDF). New Jersey Department of Health.
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