64401-21-4Relevant academic research and scientific papers
Extremely Active Organocatalysts Enable a Highly Enantioselective Addition of Allyltrimethylsilane to Aldehydes
Kaib, Philip S. J.,Schreyer, Lucas,Lee, Sunggi,Properzi, Roberta,List, Benjamin
, p. 13200 - 13203 (2016/10/30)
The enantioselective allylation of aldehydes to form homoallylic alcohols is one of the most frequently used carbon–carbon bond-forming reaction in chemical synthesis and, for several decades, has been a testing ground for new asymmetric methodology. Howe
Perfluorinated sulfonic acid resin (Nafion-H) catalysed trans-t-butylation of 7-t-butyl-1,3-disubstituted pyrenes; a new route for the preparation of 1,3-disubstituted pyrenes
Yamato, Takehiko,Hu, Jian-Yong
, p. 762 - 765 (2007/10/03)
The perfluorinated sulfonic acid resin (Nafion-H) catalyst is found to be effective in promoting the trans-t-butylation of 7-t-butyl-1,3-dialkylpyrenes to afford the corresponding 1,3-dialkylpyrenes in good yields.
Medium-Sized Cyclophanes. Part 31. Synthesis and Electrophilic Substitution of 8-Substituted Metacyclo(1,3)pyrenophanes
Yamato, Takehiko,Miyazawa, Akira,Tashiro, Masashi
, p. 3127 - 3138 (2007/10/02)
syn- and anti-2,11-Dithiametacyclo(1,3)pyrenophanes 15 have been obtained by coupling the corresponding 1,3-bis(bromomethyl)pyrene 11 and 1,3-bis(mercaptomethyl)benzenes 14 in ethanol under high-dilution conditions.Oxidation of the obtained thiametacyclophanes 15 with m-chloroperbenzoic acid afforded the corresponding syn- and anti-disulfones 18.Pyrolysis of the syn- and anti-disulfones 18 afforded exclusively the corresponding anti-metacyclo(1,3)pyrenophane 19 in 40-70percent yield along with the ring-cleavage product, 7-tert-butyl-1,3-dimethylpyrene 8.The nitration of 5,15-di-tert-butyl-8-methyl- 19b and 5,15-di-tert-butyl-8-methoxy-metacyclo(1,3)pyrenophane 19d with 1 mol equiv. of copper(II) nitrate in acetic anhydride solution exclusively occured on the more reactive pyrene ring to afford 14-nitro derivatives 21a and 21b in 83 and 86percent yield, respectively.On the other hand, the bromination of substrates 19 with bromide in methylene dichloride solution afforded 13-bromo derivatives 23 along with the transannular cyclization products 24 and 25.These different orientations for the electrophilic substitution are also discussed.
Synthesis of 1,2-Dimethylpyrene, 1,3-Dimethylpyrene and 1,2,3-Trimethylpyrene
Hempenius, Mark A.,Lugtenburg, Johan,Cornelisse, Jan
, p. 635 - 638 (2007/10/02)
The title compounds have been prepared, starting from 1H-phenalene 1.The method described in this paper is an efficient procedure for introducing methyl groups into the A-ring of pyrene.
