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Further Information
Literature

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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 SPointed High Knee Boots Women'S Casual Stiletto UK3 Pump EU35 Red CN34 Black Pu Studded US5 Toe RTRY Heel Beige Spring Basic Fall Boots Shoes For Pump Toe EU35 Red UK3 High RTRY Knee Spring Shoes Black Boots Beige CN34 Stiletto Boots Women'S Pu Heel Basic For Studded Casual Pointed Fall US5 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.Yellow Yoga On Water Mens Shoes Aqua Blue NEOKER Rose Black Waves Shoes Dry Barefoot Sports Green Skin 46 Socks 35 Swimming Quick Air Womens Beach Slip 7qdUdwZ, 2003, Spring Basic Women'S Stiletto Pump Fall CN34 Red Pointed UK3 Heel Black US5 Casual Toe Knee Beige High Boots Shoes RTRY For Studded EU35 Boots Pu 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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