 The shortcomings noted above limit the usefulness of the <unk> <unk> reaction in its canonical form . However , modifications to the reaction focused on remedying its issues continue to be an active area of academic research . In particular , the research has focused on a few key areas : rendering the reaction catalytic in the promoter , effecting the reaction with more mild promoters to improve functional group tolerance , directing the <unk> of the elimination step , and improving the overall <unk> . These have been successful to varying degrees . 
