Molecular belts. 2. Substrate-directed syntheses of belt-type and cage-type structures
作者:Peter R. Ashton、Ulrich Girreser、Daniele Giuffrida、Franz H. Kohnke、John P. Mathias、Francisco M. Raymo、Alexandra M. Z. Slawin、J. Fraser Stoddart、David J. Williams
DOI:10.1021/ja00066a010
日期:1993.6
trebly-diastereoselective synthesis of the angular macropolycyclic derivative 5. The incorporation of two diametrically-opposed [a,c]-fused units into the skeleton of 5 imposes a conical nature upon the cavity compared with the structures of macropolycyclic compounds such as the cyclacene derivatives 1 and 2. The construction of the angular macropolycyclic 5 anticipates the use of the C 3v trisdienophile 4
Phenacene compounds of formula (I) are disclosed. All the variables in the formula are the same as defined in the description. A thin film semiconductor comprising the above compounds, and a field effect transistor device, a photovoltaic device, an organic light emitting diode device and a unipolar or complementary circuit device comprising the thin film are also disclosed.
Stereospecific Synthesis of Enantiopure [6]Helicene Containing a Seven‐Membered Ring and [7]Helicene by Acid‐Promoted Stepwise Alkyne Annulations of Doubly Axial‐Chiral Precursors**
Enantiopure (>99 % ee) [6]helicene with an seven-membered ring and carbo[7]helicene have been simultaneously and quantitatively (>99 %) synthesized with opposite helicity from optically pure doubly axial-chiral cyclization precursors. The stepwise acid-promoted intramolecular alkyne annulations involved a complete axial-to-helical chirality transfer, which led to the helicity being fully stereo-controlled