Wikipedia

2,4,6-Trichlorobenzoyl chloride

2,4,6-Trichlorobenzoyl chloride or Yamaguchi's reagent is an chlorinated aromatic compound that is commonly used in a variety of organic syntheses.[2][3]

2,4,6-Trichlorobenzoyl chloride
Names
IUPAC name
2,4,6-trichlorobenzoyl chloride
Other names
Yamaguchi's reagent
Identifiers
3D model (JSmol)
Abbreviations TCBC
2050280
ChemSpider
ECHA InfoCard 100.120.466 Edit this at Wikidata
EC Number
  • 609-916-0
UNII
UN number 3265
  • InChI=1S/C7H2Cl4O/c8-3-1-4(9)6(7(11)12)5(10)2-3/h1-2H
    Key: OZGSEIVTQLXWRO-UHFFFAOYSA-N
  • C1=C(C=C(C(=C1Cl)C(=O)Cl)Cl)Cl
Properties
C7H2Cl4O
Molar mass 243.89 g·mol−1
Appearance Light yellow liquid
Density 1.561 g/mL
Boiling point 107 - 108 °C (225 - 226 °F)
Reacts with water
log P 2.738
Hazards
GHS labelling:[1]
GHS05: Corrosive
Danger
H314
P264, P280, P301+P330+P331, P303+P361+P353, P304+P340+P310, P305+P351+P338+P310, P363, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
3
0
0
Flash point 113 °C
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Yamaguchi esterification

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It is the primary reactant in Yamaguchi esterification. 2,4,6-Trichlorobenzoyl chloride readily reacts with alcohols. This newly formed reagent, when mixed with a stoichiometric amount of 4-dimethylaminopyridine, cyclizes and forms esters. This reaction creates 2,4,6-trichlorobenzoic acid as a byproduct.

 

Preparation

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2,4,6-Trichlorobenzoyl chloride is prepared by reacting 2,4,6-trichloroaniline with n-butyllithium in a carbon dioxide atmosphere. This produces 2,4,6-trichlorobenzoic acid, which can then be refluxed in thionyl chloride to form 2,4,6-trichlorobenzoyl chloride.[4]

 

Since 2,4,6-trichlorobenzoic acid is produced as a by product of the Yamaguchi esterification process, it can be refluxed again to recreate 2,4,6-trichlorobenzoyl chloride.

References

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  1. ^ "2,4,6-Trichlorobenzoyl chloride". pubchem.ncbi.nlm.nih.gov. Retrieved 7 April 2022.
  2. ^ Fürstner, Alois; Fasching, Bernhard; O'Neil, Gregory W.; Fenster, Michaël D. B.; Godbout, Cédrickx; Ceccon, Julien (2007). "Toward the total synthesis of spirastrellolide A. Part 3: Intelligence gathering and preparation of a ring-expanded analogue". Chem. Commun. (29): 3045–3047. doi:10.1039/B707835H. ISSN 1359-7345. PMID 17639136.
  3. ^ Panek, J. S., ed. (2007). Category 3, Compounds with Four and Three Carbon Heteroatom Bonds: Three Carbon—Heteroatom Bonds: Esters, and Lactones; Peroxy Acids and R(CO)OX Compounds; R(CO)X, X=S, Se, Te. Stuttgart: Georg Thieme Verlag. doi:10.1055/sos-sd-020-01369. ISBN 978-3-13-144691-6.
  4. ^ Kotammagari, Tharun (2014-04-28). "2,4,6-Trichlorobenzoyl Chloride (Yamaguchi Reagent)". Synlett. 25 (9): 1335–1336. doi:10.1055/s-0033-1341245. ISSN 0936-5214.
 

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