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. ... Reaction of β-keto phenylsulphone tosylhydrazones 2 with 2 eq. of DBU, at rt in dichloromethane, affords α,β-unsaturated ketone tosylhydrazones 4, via the tosylazoalkenes 3 obtained by 1,4-elimination of benzenesulfinic acid. ... The compounds 4e during the ...