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. ... New synthetic methods : sodium alkanechalcogenates as demethylating agents. Scope, limitation and new one-pot synthesis of diaryldiselenides. ... Sodium alkanechalcogenates (S, Se) cleave the alkylarylchalcogenides (O, S, Se). The versatility of such reagents is developed and ...