Halogen–lithium exchange between substituted dihalobenzenes and butyllithium: application to the regioselective synthesis of functionalized bromobenzaldehydes

~98%

~67%

~%

~%

~82%

~%

~%

~%

~%

~91%

~%

~%

~%

~73%

~99%

~%

~89%

~%

~%