19417-58-4Relevant articles and documents
Selective Formation of Inter- and Intramolecular A-D-A π-π Stacking: Solid-State Structures of Bis(pyridiniopropyl)benzenes
Koizumi, Take-Aki,Tsutsui, Kanako,Tanaka, Koji
, p. 4528 - 4532 (2003)
The synthesis and molecular structures of bis(pyridiniopropyl)benzene derivatives, [1,4-(4-R-C5H4N+CH 2CH2CH2)2-C6H 4][X-2 (1, R = H, X = I; 2, R = tBu, X = Br) have been investigated. Compound 1 adopts a linear structure in the solid state and the crystal packing geometry can be defined as isolated triplets formed by the phenylene ring of one molecule and two pyridinium rings of two neighboring molecules. In contrast, compound 2 has an S-shaped arrangement, and an intramolecular acceptor-donor-acceptor triplet is formed among the central phenylene ring and two terminal pyridinium rings in the same molecule. Such a distinct difference in the crystal structures of 1 and 2 can be ascribed to the substituent on the pyridinium unit. The steric repulsion of the bulky tert-butyl group hinders intermolecular A-D-A π-π stacking. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003.
EMM-28, A NOVEL SYNTHETIC CRYSTALLINE MATERIAL, ITS PREPARATION AND USE
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Paragraph 0092, (2017/07/01)
A novel synthetic crystalline material, EMM-28, can be synthesized in the presence of an organic structure directing agent (Q) selected from one or more of the following dications: EMM-28 may be used in organic compound conversion reactions and sorptive processes.
Transition-metal-catalyzed chemoselective methylenation of dicarbonyl substrates
Lebel, Helene,Davi, Michael,Stoklosa, Grzegorz T.
, p. 6828 - 6830 (2008/12/22)
(Chemical Equation Presented) Rhodium- and copper-catalyzed methylenation reactions with trimethylsilyldiazomethane, triphenylphosphine, and 2-propanol were used to react chemoselectively with aldehydes, alkoxymethylketones, and triftuoromethylketones in substrates also containing a less reactive carbonyl group. Terminal alkenes were obtained in high yields, and no protecting group was necessary in the methylenation process.