There is also the reaction (in Org. Syn. f ex) which produces alpha-bromo derivatives of carboxylic acids using PBr3, either as is, or using red P + bromine.
Rhodium: Vogel has a many procedures in synthesizing alpha-bromo derivatives of carboxylic acids.
http://www.orgsyn.org/orgsyn/orgsyn/fullTextSearch.asp (http://www.orgsyn.org/orgsyn/orgsyn/fullTextSearch.asp)
http://www.orgsyn.org/orgsyn/prep.asp?prep=cv1p0401 (http://www.orgsyn.org/orgsyn/prep.asp?prep=cv1p0401)
http://www.orgsyn.org/prep.asp?prep=cv4p0573 (http://www.orgsyn.org/prep.asp?prep=cv4p0573)
http://www.orgsyn.org/orgsyn/orgsyn/prepContent.asp?prep=cv1p0115 (http://www.orgsyn.org/orgsyn/orgsyn/prepContent.asp?prep=cv1p0115)