A New Method for the Selective Bridge Functionalization of [2.2]Paracyclophanediene – Indenyl-Annelated [2.2]Paracyclophanedienes and Their Iron Complexes
✍ Scribed by Herwig A. Buchholz; Jürgen Höfer; Mathias Noltemeyer; Armin de Meijere
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 460 KB
- Volume
- 1998
- Category
- Article
- ISSN
- 1434-193X
No coin nor oath required. For personal study only.
✦ Synopsis
Paracyclophane-1,9-diene (1) is readily deprotonated at upon treatment with zinc(II) chloride in 1,2-dichloroethane to give the indene-annelated [2.2]paracyclophane 9 (72%) and its vinylic positions with BuLi to give the monolithium derivative 2 and -in the presence of TMEDA -even the 1,9-/ the bis(indene)-annelated compounds syn-11 and anti-11 (39%, ratio 19:1). Both 9 and syn-11, when treated with 1,10-dilithium derivatives 1,9-/1,10-6. Reaction of 2 with a variety of electrophiles including benzaldehyde and ethyl FeCl 2 •(THF) 2 after deprotonation with methyllithium in the presence of excess lithium cyclopentadienide gave mixed-formate led to bridge-substituted derivatives 3a-d (71-89% yields) and 4, 5 (95 and 91%, respectively). Electrophilic ligand ferrocene-type complexes 12 (63%) and syn-/anti-16 (46%). The bis(indeno[2.2]paracyclophane-9-ene) complex substitution of 1,9-/1,10-6 with benzaldehyde gave the bis(vinylbenzyl) alcohols 1,9-/1,10-8 in 39% yield. The 13 was obtained from deprotonated 9 in 61% yield and characterized by an X-ray crystal structure analysis. vinylbenzyl alcohols 5 and 1,9-/1,10-8 underwent cyclization [ ] X-ray crystal structure analyses. ene skeleton.
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