Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... The nucleophilic substitution of gem-difluorovinylic tosyloxy group with alkyl groups is effected by treating 2,2-difluoro-1-tosyloxyvinyllithium with trialkylboranes to afford 1,1-difluoroolefins in good yields. ... A synthesis of 1,1-difluoroolefins by the substitution of ...