Crystal and molecular structure of 5a,11a-dibromojanusene

‘Face‐to‐Face’‐Benzo‐anellierte homologe Hypostrophene. Synthesen, Röntgenstrukturanalysen und PE‐Spektren

“…fur C,,H,,CI,(267,61): C 60,54,H 3,73,CI 35,74;gef. : C 60,31,H 3,66,Cl 3539. 4,5, 6,7,1S,16,17,1X-Oct~chlorhexu~y~lo[l~.7.i~.~~~ 'O.O-'~ X.0Y~".014~iY]noniideca-4,6,1S,l 7-tetruen (lob).…”

“…fur C,,H,,CI,(267,61) : C 60,54,H 3,73,CI 35,74;gef. : C 60,31,H 3,66 H-C(1,6,9,17)); 2,64 (m, H-C(12,14)); 1,71 (m. H-C(3,4,11,15)); 1,05 (m. H-C(14)); 2,57 (s, H-C(3,8)) ; 2,52 (dd, H-C(2,9)); 2,35 (m, H-C(10,13)); 2.20 (m, H-C(l)); 1,28 (m, H-C(15) 2960,2945.2925,2910,2890,2875,2855,1615, 1340, 1285,1225, 1210, 1205, 11 10, 1080, 1035, 1025, 840,800,750,700,635, 585, 565. MHz, CDCI,): 3,13 (s, H-C(3,8,14,19)); 2,70 (m, H-C(1,2,9,13)); 2 3 (m, H-C(10,12)); 1,57 (m, H-C(l1)).…”

“…Die durch die Nachbarschaft der Benzo-Ringe bedingte sterische Spannung wird offensichtlich primar von diesen Bindungen aufgefangen, die Benzo-Ringe sind jedenfalls generell im Rahmen der Fehlergrenzen planar und die Anellierungspositionen nur schwach (2-3") In Fig. 3 sind die fur die Photochemie relevanten strukturellen Details von 13b, c und des von Zrngartinger [30] analysierten Tribenzotetracyclododecatriens 42 (Reihe M) denen von 43 [2] /44 [31] (Reihe E) und von 45 [8] (Reihe I) gegeniibergestellt. Fur 43 hatten wir eine Pyramidalisierung von ca.…”

Janusene as a silver ion scavenger: insights from computation

“…1). It is considered that a [3,3]ortho-cyclophane possesses four aromatic moieties of which two moieties, due to it's strained geometry, are held together in a quasi-parallel or a cleft-shaped arrangement, in which the typical C-C distances vary from 2.987 Å in C ipso to 4.094 Å in C b 17,18 (Fig. 1).…”

“…Such proximity between these aromatic portions enables janusene to exhibit peculiar electronic properties, which have been evidenced from both experimental and theoretical perspectives. 15,[17][18][19][20][21][22] Experiments have shown that the reactivity of the janusene is critically influenced by the proximity of the facial rings. Regarding electrophilic aromatic substitutions, they occur preferentially on the beta carbons of the facial rings, F b , 15,19 due to transannular interactions that destabilize the ground state (GS) through p-repulsion and stabilize the transition state (TS) through p-delocalization.…”