7580-12-3Relevant articles and documents
Beryllium-Induced Conversion of Aldehydes
Müller, Matthias,Buchner, Magnus R.
, p. 11147 - 11156 (2019/08/12)
Aldehydes play a key role in the human metabolism. Therefore, it is essential to know their reactivity with beryllium compounds in order to assess its effects in the body. The reactivity of simple aldehydes towards beryllium halides (F, Cl, Br, I) was studied through solution and solid-state techniques and revealed distinctively different reactivities of the beryllium halides, with BeF2 being the least and BeI2 the most reactive. Rearrangement and aldol condensation reactions were observed and monitored by in situ NMR spectroscopy. Crystal structures of various compounds obtained by Be2+-catalyzed cyclization, rearrangement, and aldol addition reactions or ligation of beryllium halides have been determined, including unprecedented one-dimensional BeCl2 chains and the first structurally characterized example of an 1-iodo-alkoxide. Long-term studies showed that only aldehydes without a β-H can form stable beryllium complexes, whereas other aldehydes are oligo- and polymerized or decomposed by beryllium halides.
A convenient approach for the synthesis of 1,3,5-trioxanes under solvent-free conditions at room temperature
Li, Xinzhong,Lin, Qi,Cao, Rong
, p. 1017 - 1022 (2014/06/09)
A series of environmentally benign bis-SO3H-functionalized Bronsted acidic ionic liquids were synthesized by using aliphatic polyamines and 1,3-propanesultone as the source chemicals. These ionic liquids acted as efficient inexpensive and recyclable catalysts for cyclotrimerization of aliphatic aldehydes at room temperature under solvent-free conditions. The reactions proceeded smoothly with good to excellent isolated yields (66.9-97.6 %=) and were generally complete in 1.5 h when the amount of ionic liquids was 0.1 mol%. The ionic liquids could be recovered readily and reused five times without any significant loss in their catalytic activity. Graphical abstract: [Figure not available: see fulltext.]
Novel acidic ionic liquids as efficient and recyclable catalysts for the cyclotrimerization of aldehydes
Song, Heyuan,Chen, Jing,Xia, Chungu,Li, Zhen
experimental part, p. 266 - 273 (2011/10/31)
A mild, efficient, and ecofriendly procedure for cyclotrimerization of aldehydes was realized by using a series of novel Brnsted acidic ionic liquids (BAILs) consisting of double-SO3H groups in cations as catalysts. Good conversion of aldehydes and selectivity of trialkyl-1,3,5-trioxanes were achieved by using 1mol% of BAILs. In addition, the catalyst system could be recycled and reused at least eight times without apparent loss of activity. Taylor & Francis Group, LLC.
Tetranuclear BINOL-titanium complex in selective direct aldol additions
Schetter, Bernd,Ziemer, Burkhard,Schnakenburg, Gregor,Mahrwald, Rainer
, p. 813 - 819 (2008/09/18)
(Chemical Equation Presented) The extremely robust and water-stable tetranuclear complex Ti4(μ-BINOLato)6(μ3- OH)4 (1) catalyzes the direct aldol addition with high degrees of regioselectivity at the sterically more encumbered α-side of unsymmetrical ketones. The formation of quaternary stereocenters is described. Oxygen-containing ene components can also be used as starting material in these reactions. When used with aliphatic aldehydes, acetals 18 or acetals of aldol adducts 20 were observed. As few as 0.2 mol % loadings with this catalyst 1 were enough to complete the reactions. Mechanistical aspects of the reactions are discussed.
InCl3 as an efficient catalyst for cyclotrimerization of aldehydes: Synthesis of 1,3,5-Trioxane under solvent-free conditions
Elamparuthi,Ramesh,Raghunathan
, p. 2801 - 2804 (2007/10/03)
1,3,5-Trioxanes derived from aldehydes were synthesized using indium trichloride as a catalyst. Cyclotrimerization of the aldehydes gave excellent yields under neat conditions within a short span of time. Copyright Taylor & Francis, Inc.
Tandem reactions of Friedel-Crafts/aldehyde cyclotrimerization catalyzed by an organotungsten Lewis acid
Wang, Hsing-Shiun,Yu, Shuchun Joyce
, p. 1051 - 1055 (2007/10/03)
The tris(2-pyridyl)phosphine complex [P(2-py)3 W(CO)(NO)2](BF4)2 acts as a Lewis acid catalyst precursor for the tandem reactions of Friedel-Crafts/aldehyde cyclotrimerization, which lead to the formation of a series of hyper-branched star polymers.
A convenient solvent-free preparation of 1,3,5-trioxanes
Augé, Jacques,Gil, Richard
, p. 7919 - 7920 (2007/10/03)
In the presence of a small amount of trimethylsilyl chloride, aldehydes gave at room temperature in solvent-free conditions the corresponding 1,3,5-trioxanes with good to excellent yields.
Acetonyltriphenylphosphonium bromide in organic synthesis: A useful catalyst in the cyclotrimerization of aldehydes
Hon, Yung-Son,Lee, Chia-Fu
, p. 6181 - 6188 (2007/10/03)
Acetonyltriphenylphosphonium bromide (ATPB) is a useful catalyst for the cyclotrimerization of the aliphatic aldehydes under solvent-free condition. The aldehydes tethered with a variety of functionality such as olefin, ether, ester, bromide, azide and diester could also be cyclotrimerized under the catalysis of ATPB.
Cyclotrimerization of Aliphatic Aldehydes Catalysed by Keggin-type Heteropoly Acids and Concomitant Phase Separation
Sato, Satoshi,Furuta, Hiromi,Sodesawa, Toshiaki,Nozaki, Fumio
, p. 385 - 390 (2007/10/02)
The acid-catalysed cyclotrimerization of aliphatic aldehydes has been examined through comparison of heteropoly acids with other acid catalysts.A Keggin-type heteropoly acid such as phosphomolybdic acid catalyses the cyclotrimerization of aldehydes, such as ethanal, propanal, butanal, 2-methylpropanal, 2,2-dimethylpropanal, hexanal, octanal, and decanal, to produce the respective 2,4,6-trialkyl-1,3,5-trioxanes in high yields.Catalysts turnover number of the heteropoly acid is more than 10000 for propanal cyclotrimerization.In addition to the high catalytic activities, the reaction mixture spontaneously separates into two phases, a produ ct phase and a catalyst phase, at high conversions of aldehyde.For propanal cycltrimerization, the reaction mixture separates into two liquid phases, and the recovered catalyst phase may be repeatedly applied to the reaction without additional care in isolation of the catalyst.The phase separation phenomenon has been concluded to be caused by the insolubility of the heteropoly acid coordinated with propanal in the product 2,4,6-triethyl-1,3,5-trioxane.
Synthesis of 1,3,5-trioxanes: A new, simple method using a bentonitic earth as catalyst
Camarena,Cano,Delgado,Zuniga,Alvarez,Garcia
, p. 6857 - 6858 (2007/10/02)
A simple method for synthesizing aliphatic as well as aromatic 1,3,5-trioxanes using as catalyst a bentonitic earth is reported. The yields ranged from good to excellent.