Die Struktur alicyclischer Moleküle mit gesättigten sechsgliedrigen Ringen; Zum 100. Jahrestag der Aufstellung der Strukturformel des Cyclohexans durch Hermann Sachse

Abstract

Die St,ruktur a,licyelischer Molekiile mit gesat,tigten sechsgliedrigen Ringen; Zum 100. Jahrestag der Aufstellung der Strukturformel des Cyclohexans durch Hermann Sachse l) Gerhnrd X c r t t 11 Summary S'tnrting from BAEI'ER's conceptof fhe ring sfrain und from SAGHSE's idens of the structure of eyeloherme the historiccrl development of sfructure chpnzistry of aticyclic cmnpuun(ls 2 8 d~ssribed at tke exarnplP of saturated hydrocarfiun.v with sixmembered rangs. Vetltods for conjormcrtioncil and topogrophical analysis are preeented and illustruted at substituted cyclohexanes, systems with condensed sir-membered rmgs (decnlzn, perhydrounfhraeene, perhydrophenalene, perh ydropyrene) and systems with bridged sixmembered alicycles like adariaantune and tzozstcine. Topical problem and ,futurP decelopinents in cxlicyclic chemistry arp outlined.

Trimeric Cage Complexes of Platinum Group and Coin Metals

“…As in cyclohexane, the cyclohexane backbone of the tdppmcy ligand in the polyhedral complexes 3 , 4b , and 5 prefers the chair conformation as the ground‐state structure. Interestingly, the geometrical data expressed by the torsional angles [55.3° (for 3 ), 55.4° (for 4b ), 55.7° (for 5 ), all average values] and endocyclic angles at the ring CH 2 carbon atoms [112.3° (for 3 ), 111.7° (for 4b ), 111.2° (for 5 ), all average values] are close to those of cyclohexane (55°, 111.5°) 57,58. Therefore, upon complexation of the three phosphine groups to three metal fragments in 3 , 4b , and 5 , no geometrical constraints are exerted onto the ligand backbone as well as onto the complex fragments.…”