The acid-mediated activation of hexa-2,4-diyne-1,6-diols ( 1 ) is the standard protocol for the formation of valuable strained 1,2-dihalocyclobutenes/1,2-dihalobutafulvenes ( 3 ). However, the reaction is sluggish, associated with poor yields caused by formation...
Ghazvini et al. (Thu,) studied this question.