42467-39-0Relevant academic research and scientific papers
Synthesis of stilbene analogues by one-pot oxidation-Wittig and oxidation-Wittig-Heck reaction
Saiyed, Akeel S.,Patel, Krupa N.,Kamath, Bola V.,Bedekar, Ashutosh V.
supporting information; experimental part, p. 4692 - 4696 (2012/09/10)
Synthesis of symmetrical (and unsymmetrical) stilbene derivatives is achieved by a combination of one-pot steps of Kornblum type oxidation of benzyl halide, its simultaneous in situ formation of phosphonium salt, and subsequently their Wittig reaction. In other variant it is oxidized to aldehyde, treated with ylide generated from phosphonium salt (CH3PPh3X) to give styrene, and subjected to Pd catalyzed Heck reaction with arylhalide to give stilbenes as the three-step one-pot sequence.
POLYCYCLIC DIAZODIOXIDE-BASED BCL-2 PROTEIN ANTAGONIST
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Page 27, (2008/06/13)
Compounds of Formula 8 are provided: A and B are each independently selected from the group consisting of -NO-, -SO-, and - NR9-. C is a single bond or a double bond. D is selected from the group consisting of single bond, E is selected from th
Selective homogeneous palladium(0)-catalyzed hydrogenation of alkynes to (Z)-alkenes
Van Laren, Martijn W.,Elsevier, Cornelis J.
, p. 3715 - 3717 (2007/10/03)
Zero-valent palladium precatalysts containing rigid bidentate bis(arylimino)acenaphthene ligands (shown schematically) facilitate the highly stereoselective homogeneous catalytic hydrogenation of alkynes to (Z)- alkenes. Internal, terminal, aryl-substituted, and cyclic alkynes are suitable substrates, as are some enynes, which are chemoselectively hydrogenated to dienes. E=CO2Me; R1, R2 = 4-OCH3, 4-CH3, 2,6-(CH3)2.
New models for the study of the racemization mechanism of carbodiimides. Synthesis and structure (X-ray crystallography and 1H NMR) of cyclic carbodiimides
Molina, Pedro,Alajarín, Mateo,Sánchez-Andrada, Pilar,Carrió, Juan Server,Martínez-Ripoll, Martín,Anderson, J. Edgar,Jimeno, María Luisa,Elguero, José
, p. 4289 - 4299 (2007/10/03)
The crystal and molecular structure of carbodiimides 2 (5,6,18,19-tetradehydro-5,12,13,18,25,26-hexahydrotetrabenzo[d,h,m,q][1,3,10,12] tetraazacyclooctadecine) and 3 (8,10,22,24-tetraazapentacyclo-[23.3.1.3,7.111,15.1 17,21]dotriaconta-1(29),3,5,7(32),8,9,11,13,15(31),17,19,21(30),22, 23,25,27-hexadecaene) have been determined. The activation barriers for the racemization of carbodiimides 1 (6,7-dihydrodibenzo[d,h][1,3]diazonine), 2, and 3 have been determined. While 1 presents a relatively high barrier (17.4 kcal mol-1), 2 and 3 have very low activation barriers (between 5 and 7 kcal mol-1). We tentatively conclude that open-chain and large-ring carbodiimides racemize by nitrogen inversion or trans-rotation while medium-size cyclic carbodiimides racemize by cis-rotation.
