Syntheses of the pentacyclo[6.3.0.02,6.03,10.05,9]undecyl (trishomocubyl) and tetracyclo[6.3.0.04,11.05,9]undeca-2,6-dienyl (homohypostrophenyl) systems

The reaction of potassium iodide in polyhydrogen fluoride – pyridine with two cage diols. A simple synthesis of tetracyclo[6.3.0.04,11. 05,9]undeca-2,6-diene ("homohypostrophene")

“…We now describe a variant of this / l 1 procedure even simpler in practice. As before (I), the diketone was reduced to the endo,endo-diol 2 (1,5). The latter was treated with potassium iodide in polyhydrogen fluoride -pyridine, a reagent recently developed by Olah and Welch (6), and the hours, and three products appeared: first the ether 4 ("oxabirdcage" (5,7)) formed rapidly and then dis-1 1 appeared (20% after 2 h, 7% after 7 h, 0% after 24 h); then more slowly, the diiodide 5 and homohypostrophene 6.…”

“…Perhaps the simplest of these routes was the threestep procedure (Scheme 1: 1 + 2+ 3-6) of Smith and Barborak (1). We now describe a variant of this / l 1 procedure even simpler in practice.…”

Highly Reactive Intermediates from the Cocondensation Reactions of Iron, Cobalt and Nickel Vapor with Arenes

“…[I3-' 81 The requirements of preparative metal atom chemistry clearly favor the q6: q4-structure type for benzene and toluene." 6 , 71 In contrast to this, the stable bis(hexamethy1benzene)iron has an q6 :q6-structure, and can be prepared by classical methods. ["] In a number of cases, a three component reaction of Fe(g) with arenes and ligands L has proved to be an alternative for the formation of [(arene)FeL,] complexes."…”

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

“…-In den Schemata 2') und 3 sind die bewahrten Vorgehensweisen skizziert, nach denen Hypostrophen l a [12], auch nach verbessertem Verfahren [13] noch immer recht aufwendig in der Herstellung, und die gut zuganglichen Homologen l b [ 101 [14] [15] und lc [ l l ] einfach bzw. zweifach benzo-anelliert wurden.…”

“…IR (KBr): 3065, 2975, 1575, 1550, 1420, 1380, 1240, 1200, 1170, 1140. 'H-NMR (250 MHz, CDCI,): 7,05 (s, H-C(5-8), (13)(14)(15)(16)); 4,43 (m, H-C(3,10,1 l,I8)); 3.64 (m, H-C (I ,2) …”