13718-50-8Relevant articles and documents
The heat capacity and density of solutions of barium and tetrabutylammonium iodides in N-methylpyrrolidone at 298.15 K
Novikov,Lenina,Vasilev
, p. 392 - 395 (2009)
The heat capacity and density of solutions of barium and tetrabutylammonium iodides in N-methylpyrrolidone (MP) were studied at 298.15 K by calorimetry and densimetry. The standard partial molar heat capacities and volumes (Cp2 and V2) of the electrolytes
Regioselective Coupling Reaction of Allylic Barium Reagents with Epoxides
Yasue, Katsutaka,Yanagisawa, Akira,Yamamoto, Hisashi
, p. 493 - 497 (1997)
The regioselective coupling reaction of epoxides with allylic barium reagents was achieved. All reactions resulted in high yields with remarkable α-selectivities. 2-Propynylbarium reagent afforded exclusively the corresponding acetylenic alcohol.
Highly Active Superbulky Alkaline Earth Metal Amide Catalysts for Hydrogenation of Challenging Alkenes and Aromatic Rings
Eyselein, Jonathan,F?rber, Christian,Grams, Samuel,Harder, Sjoerd,Knüpfer, Christian,Langer, Jens,Martin, Johannes,Thum, Katharina,Wiesinger, Michael
supporting information, p. 9102 - 9112 (2020/03/30)
Two series of bulky alkaline earth (Ae) metal amide complexes have been prepared: Ae[N(TRIP)2]2 (1-Ae) and Ae[N(TRIP)(DIPP)]2 (2-Ae) (Ae=Mg, Ca, Sr, Ba; TRIP=SiiPr3, DIPP=2,6-diisopropylphenyl). While monomeric 1-Ca was already known, the new complexes have been structurally characterized. Monomers 1-Ae are highly linear while the monomers 2-Ae are slightly bent. The bulkier amide complexes 1-Ae are by far the most active catalysts in alkene hydrogenation with activities increasing from Mg to Ba. Catalyst 1-Ba can reduce internal alkenes like cyclohexene or 3-hexene and highly challenging substrates like 1-Me-cyclohexene or tetraphenylethylene. It is also active in arene hydrogenation reducing anthracene and naphthalene (even when substituted with an alkyl) as well as biphenyl. Benzene could be reduced to cyclohexane but full conversion was not reached. The first step in catalytic hydrogenation is formation of an (amide)AeH species, which can form larger aggregates. Increasing the bulk of the amide ligand decreases aggregate size but it is unclear what the true catalyst(s) is (are). DFT calculations suggest that amide bulk also has a noticeable influence on the thermodynamics for formation of the (amide)AeH species. Complex 1-Ba is currently the most powerful Ae metal hydrogenation catalyst. Due to tremendously increased activities in comparison to those of previously reported catalysts, the substrate scope in hydrogenation catalysis could be extended to challenging multi-substituted unactivated alkenes and even to arenes among which benzene.
Intramolecular Alkene Hydroamination with Hybrid Catalysts Consisting of a Metal Salt and a Neutral Organic Base
Fischer, Christian A.,Harder, Sjoerd,Langer, Jens,Nguyen, D. Thao,Penafiel, Johanne,R?sch, Andreas,Stegner, Philipp C.,Wiesinger, Michael
, p. 3387 - 3394 (2020/09/04)
Hybrid catalysts consisting of alkaline earth iodides (AeI2) and the Schwesinger base tBuP4 catalyse the intramolecular alkene hydroamination of H2C=CHCH2CR2CH2NH2 [CR2/sub
Enantioselective total synthesis of hyperforin
Sparling, Brian A.,Moebius, David C.,Shair, Matthew D.
supporting information, p. 644 - 647 (2013/03/13)
A modular, 18-step total synthesis of hyperforin is described. The natural product was quickly accessed using latent symmetry elements, whereby a group-selective, Lewis acid-catalyzed epoxide-opening cascade cyclization was used to furnish the bicyclo[3.3
Studies on ABX6 Compounds. IV[4] The Structures of AUI6 Compounds (A: Sr, Eu, Ba)
Beck, H. P.,Kuehn, F.
, (2008/10/08)
The compounds SrUI6, EuUI6 and BaUI6 are synthesized for the first time.Their crystal structures are isotypic, and they can be described as ord ered substitution variants of the AlCl3 type.
Process for preparing primycin salts
-
, (2008/06/13)
This invention relates to salts of primycin formed with an organic acid--preferably a C1-16 aliphatic carboxylic acid, a halogenated carboxylic acid, an aliphatic dicarboxylic acid, an aromatic carboxylic acid, a substituted aromatic carboxylic acid or an organic sulfonic acid--or an inorganic acid--preferably a hydrohalogenic acid. There is furtheron provided a process for the preparation of new primycin salts which comprises reacting a suspension of primycin sulfate formed with an aliphatic alcohol containing 1-4 carbon atoms with a barium salt. The new primycin salts of the present invention possess excellent antibiotic properties.
High Pressure Polymorphism of BaI2
Beck, H. P.
, p. 1255 - 1260 (2007/10/02)
High pressure investigations of BaI2 yielded a new polymorph, which could be quenched and characterized by X-ray methods.PbCl2-type BaI2 is converted to an anti-Fe2P-type structure with more regular coordination polyhedra and an increase in effective coordination numbers.We discuss changes in bonding type by comparing the Madelung part of lattice energy in the two polymorphs. - Keywords: High Pressure Polymorphism, Alkaline earth Halides
