- Gram-Scale Synthesis of the 1,1,n,n-Tetramethyl[n](2,11)teropyrenophanes
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A gram-scale synthesis of a series of 1,1,n,n-tetramethyl[n](2,11)teropyrenophanes (n=7–9) has been accomplished as well as the first synthesis of the next higher homologue 1,1,10,10-tetramethyl[10](2,11)teropyrenophane. The scale-up of the original small
- Bodwell, Graham J.,Dawe, Louise N.,Ghasemabadi, Parisa Ghods,Houska, Václav,Unikela, Kiran Sagar,Zhao, Yuming
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- The Development of Synthetic Routes to 1,1,n,n-Tetramethyl[n](2,11)teropyrenophanes
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A concise synthetic approach to 1,1,n,n-tetramethyl[n](2,11)teropyrenophanes has been developed. It involves the construction of triply-bridged pyrenophanes, during which the three bridges are installed successively using Friedel-Crafts alkylation, Wurtz coupling and McMurry reactions. At the same time, the innate regiochemical preferences of pyrene toward electrophilic aromatic substitution are relied upon to control the substitution pattern. A cyclodehydrogenation reaction is then employed to generate the teropyrene system directly in a nonplanar conformation. The crystal structure of 1,1,7,7-tetramethyl[7](2,11)teropyrenophane was determined and the teropyrene system was found to have an end-to-end bend angle of 177.9°.
- Unikela, Kiran Sagar,Merner, Bradley L.,Ghasemabadi, Parisa Ghods,Warford, C. Chad,Qiu, Christopher S.,Dawe, Louise N.,Zhao, Yuming,Bodwell, Graham J.
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p. 4546 - 4560
(2019/07/04)
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- The head-to-head reductive coupling of homoallylic alcohols promoted by titanium(II)-olefin complexes
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Reaction of homoallylic alcohols 1a-e with i-PrMgBr in the presence of Ti(i-PrO)4 leads to the unbranched saturated diols 2a-e as the main products in moderate to good yields. The head-to-head regioselectivity in reductive coupling of 4-penten-
- Isakov, Vladimir E.,Kulinkovich, Oleg G.
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p. 967 - 970
(2007/10/03)
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- Acyclic monomers which when cured are reworkable through thermal decomposition
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Compounds containing unsaturated aliphatic moieties which are linked to each other by a tertiary oxycarbonyl containing acyclic moiety are basis for compositions which are cured to polymer networks which are thermally decomposable to provide residue which can be dissolved to allow repair of inoperative assemblies by replacement of inoperative components or recovery or recycling of operative elements which are affixed in assemblies by the cured compositions.
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