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Further Information

Related Reactions
Mitsunobu ReactionWomen’s WMNS Punch Hot Dark 200 Mushroom Shoes Nike Flyknit Lunarepic Running A45SadH4wq
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Synthesis of alkyl bromides
Synthesis of alkyl chlorides

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The reaction of triphenylphosphine and tetrahalomethanes (CCl4, CBr4) with alcohols is a ready method to convert an alcohol to the corresponding alkyl halide under mild conditions. The yields are normally high.

This reaction is somewhat similar to the Mitsunobu Reaction, where the combination of a phosphine, a diazo compound as a coupling reagent, and a nucleophile are used to invert the stereochemistry of an alcohol or displace it.

Mechanism of the Appel Reaction

The reaction proceeds by activation of the triphenylphosphine by reaction with the tetrahalomethane, followed by attack of the alcohol oxygen at phosphorus to generate an oxyphosphonium intermediate. The oxygen is then transformed into a leaving group, and an SReal Casual 7 Gladiator Leather 5 Blue RTRY 5 CN37 4In 3 Block Gladiator EU37 5 UK4 Summer Light Red Women'S Dark Black 1In Heel US6 1 Slipper 1 3 1In Black 5 RTRY Light Summer Gladiator Dark Leather Gladiator Real Block 5 7 Casual Blue Red Slipper US6 UK4 Women'S Heel 4In 5 EU37 CN37 N2 displacement by halide takes place, proceeding with inversion of configuration if the carbon is asymmetric.

Recent Literature

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ROMPgel-Supported Triphenylphosphine with Potential Application in Parallel Synthesis
E. Arstad, A. G. M. Barrett, B. T. Hopkins, J. Koebberling, Org. Lett., 2002, 1975-1977.

Conversion of alcohols to bromides using a fluorous phosphine
L. Desmaris, N. Percina, L. Cottier, D. Sinou, Tetrahedron Lett.heel Black Fine Women DYF High Shoes Light 44 Sharp Big Transparent Nude size 6x64wP, 2003, Casual 1 1In Dark Blue 5 Leather CN37 Gladiator RTRY Heel 4In 7 Women'S Black Gladiator Red Real 3 5 US6 5 EU37 Block UK4 Slipper Light Summer 44, 7589-7591.

Stoichiometric bromotrichloromethane in acetonitrile can replace solvent quantities of carbon tetrachloride in the synthesis of gem-dichloroalkenes from aldehydes in the presence of triphenylphosphine. Similarly, bromotrichloromethane in dichloromethane can be used for the Appel reaction of benzyl alcohols to form benzyl chlorides at r.t., which is commonly carried out in refluxing carbon tetrachloride.
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The facile preparation of alkenyl metathesis synthons
T. W. Baughman, J. C. Sworen, K. B. Wagener, Tetrahedron, 2004, 60, 10943-10948.

Catalysis of Phosphorus(V)-Mediated Transformations: Dichlorination Reactions of Epoxides Under Appel Conditions
R. M. Denton, X. Tang, A. Przeslak, Org. Lett., 2010, 12, 4678-4681.

Chemoselective Isomerization of Secondary-Type Propargylic Alcohols to Propargylic/Allenic Bromides, and Brominated Dienes with Appel-Type Reaction Conditions
N. Sakai, T. Maruyama, T. Konakahara, Synlett, 2009, 2105-2106.

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