Chemistry: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
CAS Number	1189-85-1
3D model (JSmol)	Interactive image
ChemSpider	11649895
PubChem CID	102059956 wrong formula
RTECS number	GB2900000
InChI InChI=1S/2C4H9O.Cr.2O/c2*1-4(2,3)5;;;/h2*1-3H3;;;/q2*-1;+2;; Key: PNWJTIFZRHJYLK-UHFFFAOYSA-N InChI=1/2C4H9O.Cr.2O/c2*1-4(2,3)5;;;/h2*1-3H3;;;/q2*-1;+2;;/rC8H18CrO4/c1-7(2,3)12-9(10,11)13-8(4,5)6/h1-6H3 Key: PNWJTIFZRHJYLK-PZTLRDNSAU
SMILES O([Cr](OC(C)(C)C)(=O)=O)C(C)(C)C
Properties
Chemical formula	[(CH3)3CO]2CrO2
Molar mass	230.3 g/mol
Appearance	red oil
Melting point	−2.8 °C (27.0 °F; 270.3 K)
Solubility in water	Miscible
Hazards
NIOSH (US health exposure limits):
PEL (Permissible)	TWA 0.005 mg CrO3/m3 [skin]
REL (Recommended)	Ca TWA 0.001 mg Cr(VI)/m3
IDLH (Immediate danger)	Ca [15 mg/m3 {as Cr(VI)}]
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.

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.

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.