title: Synthesis of di-, tri- and tetracyclopropylhydrazines.
abstract: Previously unknown 1,1-dicyclopropylhydrazine was obtained in two steps starting from dicyclopropylamine. It serves as a convenient starting material to tri- and tetracyclopropylhydrazines, which have not been described in the literature either. Tricyclopropylhydrazine was prepared in an overall four-step sequence featuring the de Meijere-Chaplinski modification of the Kulinkovich reaction as a key step. Tetracyclopropylhydrazine was obtained by the reductive amination of the cyclopropanone ethyl trimethylsilyl acetal with 1,1-dicyclopropylhydrazine or with the parent hydrazine. Synthetic utility of these cyclopropylhydrazine building blocks is presented as well.
authors.affiliation: Institute of Chemistry, Saint Petersburg State University, Universitetsky pr. 26, 198504 Saint Petersburg, Russia. m.kuznetsov@spbu.ru.
authors.forename: Aleksandr N
authors.initials: AN
authors.lastname: Shestakov
authors.affiliation: Institute of Chemistry, Saint Petersburg State University, Universitetsky pr. 26, 198504 Saint Petersburg, Russia. m.kuznetsov@spbu.ru.
authors.forename: Mikhail A
authors.initials: MA
authors.lastname: Kuznetsov