2,2,2-Trichloroethoxycarbonyl chloride

Trichloroethyl chloroformate is used in organic synthesis for the introduction of the trichloroethoxycarbonyl (Troc) protecting group for amines, thiols and alcohols. It readily cleaves in the presence of other carbamates.

Quick facts Names, Identifiers ...

2,2,2-Trichloroethoxycarbonyl chloride^[1]

Names
Preferred IUPAC name 2,2,2-Trichloroethyl carbonochloridate
Other names 2,2,2-Trichlorethoxycarbonyl chloride Trichloroethyl chloroformate
Identifiers
CAS Number	17341-93-4 Y
3D model (JSmol)	Interactive image Interactive image
ChemSpider	78534 Y
ECHA InfoCard	100.037.587
EC Number	241-363-7
PubChem CID	87063
UNII	99UY6LZN4R
CompTox Dashboard (EPA)	DTXSID3066188
InChI InChI=1S/C3H2Cl4O2/c4-2(8)9-1-3(5,6)7/h1H2 Y Key: LJCZNYWLQZZIOS-UHFFFAOYSA-N Y InChI=1/C3H2Cl4O2/c4-2(8)9-1-3(5,6)7/h1H2 Key: LJCZNYWLQZZIOS-UHFFFAOYAA
SMILES O=C(OCC(Cl)(Cl)Cl)Cl ClC(Cl)(Cl)COC(Cl)=O
Properties
Chemical formula	C3H2Cl4O2
Molar mass	211.85 g·mol−1
Density	1.539 g/cm3
Melting point	0 °C (32 °F; 273 K)
Boiling point	171 to 172 °C (340 to 342 °F; 444 to 445 K)
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H314, H330, H331
Precautionary statements	P260, P264, P270, P271, P280, P284, P301+P312, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P311, P320, P321, P330, P363, P403+P233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

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The Troc group is traditionally removed via Zn insertion in the presence of acetic acid, resulting in elimination and decarboxylation.