Categories: C-Cl Bond Formation >
Synthesis of alkyl chlorides
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Nucleophilic fluorination using CsF or alkali metal fluorides was completed in
short reaction time in the presence of [bmim][BF4] affording the
desired products without any byproducts. Facile nucleophilic substitutions such
as halogenations, acetoxylation, nitrilation, and alkoxylations in the presence
of ionic liquids provided the desired products in good yields.
D. W. Kim, C. E. Song, D. Y. Chi, J. Org. Chem., 2003, 68,
4281-4285.

The preparation of alkenyl halides of any length from inexpensive starting
reagents is reported. Standard organic transformations were used to prepare
straight-chain α-olefin halides in excellent overall yields with no
detectable olefin isomerization and full recovery of any unreacted starting
material.
T. W. Baughman, J. C. Sworen, K. B. Wagener, Tetrahedron, 2004,
60, 10943-10948.

The reaction of alcohols and β-amino alcohols with
2,4,6-trichloro[1,3,5]triazine and N,N-dimethylformamide in methylene
chloride at room temperature gave the corresponding chlorides, and with NaBr
gave the corresponding bromides in high yields.
L. de Luca, G. Giacomelli, A. Porcheddu, Org. Lett., 2002,
4, 553-555.

An efficient InCl3-catalyzed reaction of secondary, tertiary and
benzylic alcohols with chlorodimethylsilane in the presence of benzil gave
the corresponding organic chlorides under mild conditions. In the absence of
benzil, the reducing products through dehydroxyhydration were obtained.
M. Yasuda, S. Yamasaki, Y. Onishi, A. Baba, J. Am. Chem. Soc.,
2004,
126, 7186-7187.

An indium(III) hydroxide-catalyzed reaction of carbonyls and
chlorodimethylsilane afforded the corresponding deoxygenative chlorination
products. Ester, nitro, cyano, or halogen groups were not affected during
the reaction course. Typical Lewis acids such as TiCl4, AlCl3,
and BF3ˇOEt2 showed no catalytic activity. The
reaction mechanism is discussed.
Y. Onishi, D. Ogawa, M. Yasuda, A. Baba, J. Am. Chem. Soc., 2002,
124, 13690-13691.

Group 5 and 6 metal chlorides were found as very efficient catalysts for
acylative cleavage of ethers. Compared with conventional Lewis acid
catalysts, group 5 and 6 metal chlorides showed better results in the
catalytic C-O bond cleavage.
Q. Guo, T. Miyaji, R. Hara, B. Shen, T. Takahashi, Tetrahedron, 2002, 58,
7327-7334.

Halofluorination of alkenes in the presence of trihaloisocyanuric acids and HF•pyridine
results in the formation of vicinal halofluoroalkanes in good yields. The
reaction is regioselective leading to Markovnikov-oriented products and the
halofluorinated adducts follow anti-addition in the case of cyclohexene
and 1-methylcyclohexene.
L. T. C. Crespo, R. da S. Ribeiro, M. S. S. de Mattos, P. M. Esteves, Synthesis, 2010,
2379-2382.


