rated without material loss by flash chromatography. The bismesylates 19 b/20 b, prepared under standard conditions in 85-90% yield, can be converted into the tetracyclic aziridine 21 b (70-85%) under the conditions used for 5 b (1 0 mmol, triphenylphosphane/THF). Cyclization of 21 b to 22 proceeds
CIS-TRIS-(2.2.2]-σ-homobenzene - synthesis and thermolysis
✍ Scribed by M. Maas; M. Lutterbeck; D. Hunkler; H. Prinzbach
- Book ID
- 104217316
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- French
- Weight
- 200 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0040-4039
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Tris-[2.2.1]-and tris-[2.2.2] -o-homobenzenes are synthesised by reaction of l,l'-bicyclobutenyl with appropriate dienophiles and hydrogenation of the adducts. 'X' 1 1 2 should be attained by means of the [2.2.1]-and [2.2.2]-homoand 12-membered transition states resp. In view of the conthe area of c
The three dioxa-trla-[2.1.1]4-homobeuzeuea ( 5)-( 7) have beau ayuthealsed. Preliminary thermolysla experimenta la the gas-phare (350-4OO'C) allow a qualitative descriptiou of their thermal isomeri~atiou proceseee. We recently showed, that for the carbocyclic trie-[2.l.l]+y-homobenzeues (l)/(3) (X-
Das fur Synthesen in der ,,C-Reihe""] bewahrte trans-Dioxa-tris-o-homobenzolcarboni tril 17 I2] ist, als Epimerengemisch, ein gut zugangliches Edukt fur Monoazaoctabisvalene 2. Es ist an C-9 acid genug, um ohne wesentliche Beeintrichtigung der Epoxidfunktionen deprotoniert und regioselektiv unter Dr