Atom-Economic, Metal- and Halogen-Free Synthesis of Podands: α,ω-Diphosphines and Their Chalcogenides Separated by Alkane Diol Spacers - Oparina, Ludmila A.; Gusarova, Nina K.; Vysotskaya, Oksana V.; Kolyvanov, Nikita A.; Artem’ev, Alexander A.; Trofimov, Boris A. (Synthesis, 2014)