[PDF] Top 20 Chiral Ureas and Thioureas Supported on Polystyrene for Enantioselective Aza Henry Reaction in Solvent free conditions
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Chiral Ureas and Thioureas Supported on Polystyrene for Enantioselective Aza Henry Reaction in Solvent free conditions
... organocatalysts supported on chemically inert material made the process more sustainable and greener, 27 and based on our previous experience in the used of sulfonyl ... See full document
27
Short Synthesis of Novel Recyclable Chiral Bifunctional Thioureas from Aminoalkyl Polystyrene and their use as Organocatalysts in Stereoselective aza-Henry Reaction
... component on the enantioselection was also studied, observing that the reactions promoted by thioureas 13-15, derived from cyclohexane diamine, were more enantioselective than those promoted by ... See full document
10
Bottom up Synthesis of Novel Supported Thioureas and Their Use in Enantioselective Solvent free Aza Henry and Michael Additions
... the reaction of 15a and 16a was carried out in two different apolar solvents such as DCM and toluene, the addition product 17aa was obtained in good yield (68- 70%) and very good ... See full document
17
Aminocatalytic functionalization of carbonyl compounds: a powerful strategy for enantioselective reaction development
... handle for the covalent activation of carbonyl ...nitrogen in the quinuclidine core can greatly contribute to the catalysis while altering the electronic nature of the primary ...acidic conditions: ... See full document
185
Steric and chemical effects on the hydrogen adsorption and dissociation on free and graphene–supported palladium clusters
... support on the adsorption of hydrogen on Pd clusters. Hydrogen adsorbs on Pd clusters following two channels: molecular adsorption and dissociative ...investigated on free Pd ... See full document
19
The role of proton shuttling mechanisms in solvent free and catalyst free acetalization reactions of imines
... 13 and the formation of a C – C or heteroatom-C bond, both of which could be ...amidoalkylation and related reactions) in their racemic and enantioselective versions, 14 we first ... See full document
13
A novel lipase catalyzed method for preparing ELR based bioconjugates
... [18-20] in fields such as tissue engineering, regenerative medicine in general or controlled drug ...machinery in bacteria allows us to obtain polymers with a perfectly defined composition and ... See full document
28
Dosage of atenolol tablets by spectrophotometry with phenol red
... A spectrophotometric method is proposed for the analysis of atenolol, based on its reaction with the indicator phenol red in an acetone environment.. Experimental conditions for the form[r] ... See full document
1
Rigorous results for the minimal speed of Kolmogorov Petrovskii Piscounov monotonic fronts with a cutoff
... follows: in Sec. II, we put in a rigorous mathematical framework the maximizing principle (7), for a rather general class of profiles with minimal regularity properties (in particular allowing ... See full document
18
Enantioselective synthesis of natural products
... lie in a plane approximately parallel to the allyl, while the lowered flaps represent the phenyls which are somewhat perpendicular to the ...nucleophile and the chiral ligand also directs it to ... See full document
219
In syringe stirring: A novel approach for magnetic stirring assisted dispersive liquid liquid microextraction
... used for the first time for magnetic stirring- assisted dispersive liquid–liquid microextraction ...time and is based on the disruption of the extraction solvent by the kinetic energy of ... See full document
9
Antibacterial and remineralizing fillers in experimental orthodontic adhesives
... antimicrobial and bioactive activities are desirable [4], and could be an alternative to prevent white ...[6] and to induce the remineralization of enamel that is already affected ...surfactant ... See full document
11
Collective transitivity in majorities based on difference in support
... used for diminishing this handicap, we focus on majorities based on difference in ...difference in support between alternatives in order to select the winner. In this ... See full document
18
Molecular Design of Cyclopentadienyl Tantalum Sulfide Complexes
... di- and trinuclear cyclopentadienyl sulfide tantalum complexes have been synthesized, in which the presence of the cyclopentadienyl ligand significantly enhances the synthesis, characterization and ... See full document
32
Zr-SBA-15 Acid Catalyst: Optimization of the Synthesis and Reaction Conditions for Biodiesel Production from Low-grade Oils and Fats
... activity in FAME production by methanolysis of highly acidic crude palm oil, accompanied by high stability and reusability after calcination ...variables and the reaction ...factor, and ... See full document
38
Thermodynamic analysis of the autothermal partial oxidation/steam reforming of ethanol by MeO (Me = Ni, Cu) with CO2 capture
... process for hydrogen production. Compared to ethanol SR, POX is exothermic and fast, and very appropriate for handling rapid loading variations, such as those usually demanded by ... See full document
16
Chiral Bifunctional Thioureas and Squaramides Grafted into Old Polymers of Intrinsic Microporosity for Novel Applications
... prepared in two steps starting from ...equiv.) in dichloromethane (10 mL) was allowed to swell for 30 ...equiv.) and thiophosgene (44 µ L, ...shaking for 3 h, the reaction ... See full document
12
Aerosol optical, microphysical and radiative forcing properties during variable intensity African dust events in the Iberian Peninsula
... aerosols and how they behave from the radiative standpoint because they are not influenced by the aerosol ...burden. For instance the single scattering albedo (SSA( λ )), the ratio of scattering to ... See full document
13
Supported bifunctional thioureas as recoverable and reusable catalysts for enantioselective nitro-Michael reactions
... ball-milling conditions: Catalyst VI (15 mg, ...mmol) and nitroalkene ...placed in a Mixer Mill MM 200 and the mixture was milled at 5 Hz of vibrational frequency at room temperature until ... See full document
8
A theoretical study of the Duff reaction : insights into its selectivity
... 23 (a) J. McKearn, G. Gordon, J. Cunningham, S. Gately, A. Koki and J. Masferrer, US 2002/0103141, 2002; (b) W. Guo, B. Wu, X. Zhou, P. Chen, X. Wang, Y.-G. Zhou, Y. Liu and C. Li, Angew. Chem., Int. Ed., ... See full document
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