10.18453/rosdok_id00003451 Suhrbier, Tim Tim Suhrbier http://d-nb.info/gnd/1250197988 https://orcid.org/0000-0002-9521-0312 Universität Rostock 2021 540 Chemistry & allied sciences 2021 en http://purl.uni-rostock.de/rosdok/id00003451 urn:nbn:de:gbv:28-rosdok_id00003451-3 This thesis summarizes the synthesis and characterization of an unprecedented heterocyclobutane derivative. To assess the biradical character, quantum mechanical computations were carried out. The second part elaborates on the reactivity (LEWIS acids/bases, an isonitrile, carbon monoxide, chalcogens). Notably, the addition of alkenes/alkynes to form phosphiranes/phosphirenes highlights the phosphinidene-type reactivity. In the last part, heavier congeners (As, Sb, Bi) of chlorinated precursors and theoretical investigations of their corresponding reduced heterocycles is discussed.