- The Development of Synthetic Routes to 1,1,n,n-Tetramethyl[n](2,11)teropyrenophanes
-
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.
-
-
Read Online
- A Grignard-type phase-vanishing method: Generation of organomagnesium reagent and its subsequent addition to carbonyl compounds
-
Abstract A quadraphasic phase-vanishing system comprised of diethyl ether, magnesium, perfluoropolyether, and iodoalkane efficiently generated the corresponding Grignard reagents, which subsequently added to carbonyl compounds in the ether layer to afford alkylated alcohols in good yields.
- Matsubara, Hiroshi,Niwa, Yuki,Matake, Ryosuke
-
p. 1276 - 1280
(2015/06/02)
-
- Boron trifluoride-mediated alkylation of diphenylphosphine with tert-alkyl fluoride
-
(Chemical Equation Presented) Treatment of tertiary alkyl fluoride with diphenylphosphine in the presence of a stoichiometric amount of boron trifluoride etherate yields the corresponding tert-alkyldiphenylphosphine despite the coexistence of the strong L
- Hirano, Koji,Yorimitsu, Hideki,Oshima, Koichiro
-
p. 4873 - 4875
(2007/10/03)
-
- Acyclic monomers which when cured are reworkable through thermal decomposition
-
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.
- -
-
-
- A Convenient Synthesis of Acyclic 1,n-Diketones (n=5-8) from 2-t-Butylperoxycycloalkanones
-
The reaction of organolithium with 2-alkyl-2-t-butylperoxycycloalkanones, readily available from t-butylperoxylation of 2-alkylcycloalkanones, gave 2-t-butylperoxy-1-cycloalkanol derivatives quantitatively, thermal decomposition of which with or without an acid afforded 1,n-diketones (n=5-8) in excellent yields.
- Nishinaga, Akira,Rindo, Katsuhiko,Matsuura, Teruo
-
p. 1038 - 1041
(2007/10/02)
-