Tag: M.W:100-200

Reference of 1436-59-5, An article , which mentions 1436-59-5, molecular formula is C6H14N2. The compound – cis-Cyclohexane-1,2-diamine played an important role in people’s production and life.

Consistent supramolecular assembly arising from a mixture of components-self-sorting and solid solutions of chiral oxygenated trianglimines

The [3 + 3] cyclocondensation of either oxygen or methoxy group-containing terephthalaldehydes with optically pure vicinal diamines provides triangular macrocycles, whose constitution and symmetry depend on the structure of the aldehyde substrate. Formation of hexa-oxygenated trianglimine is highly stereoselective: that is, the use of racemic diamine yields a racemic mixture of homochiral triangular macrocycles, each having the same absolute configuration at all stereogenic centers. However, no self-sorting is observed when a mixture of non-, mono- and di-oxygenated dialdehydes is subjected to the cyclocondensation reaction with the optically pure diamine. In crystals, the variously oxygenated trianglimines consistently assemble into chiral columnar aggregates and form two- or three-component solid solutions. Some of these assemblies exhibit intracolumnar and/or intercolumnar inclusion properties. While the tris-oxygenated trianglimine crystallizes as a solid solution of molecular isomers, a mixture of uniformly chiral macrocycles that are built of variously oxygenated aldehyde sub-units provides a ternary solid solution deprived of any solvent molecules. For racemic trianglimine, formation of supramolecular columnar assemblies is accomplished by enantioselective self-recognition.

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Chiral Catalysts,
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Related Products of 21436-03-3. Let¡¯s face it, organic chemistry can seem difficult to learn. Especially from a beginner¡¯s point of view. Like 21436-03-3, Name is (1S,2S)-Cyclohexane-1,2-diamine. In a document type is Article, introducing its new discovery.

[PtCl(eta1-CH2-CH2OR)(NN)] and [PtCl(eta2-CH2CH2)(NN)]+, NN = dinitrogen ligand, complexes. Sterical and electronic effects evidenced by NMR analysis

In this work we report on the synthesis of new [PtCl(eta2-CH2CH2)(NN)]+ and [PtCl(eta1-CH2-CH2OCH3)(NN)] complexes, with different NN dinitrogen ligands, i.e. ethylenediamine (en), R,R- and S,S-diaminocyclohexane (R,R- and S,S-chxn), R,R- and S,S-N,N,N?,N?-tetramethyl-1,2-diaminocyclohexane (R,R- and S,S-Me4chxn). In particular, the factors determining complex stability are highlighted, and discussed in relation to 1H, 13C and 195Pt NMR chemical shifts exhibited by different complexes bearing hindered or unhindered diamine or diimine ligands.

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Chiral Catalysts,
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The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.1436-59-5, Name is cis-Cyclohexane-1,2-diamine, molecular formula is C6H14N2. In a Article£¬once mentioned of 1436-59-5, SDS of cas: 1436-59-5

Synthesis of monoacylated derivatives of 1,2- cyclohexanediamine. Evaluation of their catalytic activity in the preparation of Wieland-Miescher ketone

Ureas, carbamoyl derivatives, amides, and sulfonamides can be easily prepared from the strained (R,R)-cylohexanediamine urea (1) in high yield, leaving a free amino group that shows good catalytic activity in intramolecular aldol condensations. The preparation of Wieland-Miescher ketone has been studied with these catalysts.

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Chiral Catalysts,
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A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1806-29-7, Name is 2,2-Biphenol, molecular formula is C12H10O2. In a Article£¬once mentioned of 1806-29-7, Recommanded Product: 1806-29-7

Total synthesis of (+)-demethoxycardinalin 3

The total synthesis of (+)-demethoxycardinalin 3 is described. The synthetic strategy features the synthesis of dimeric Fischer carbene and its use in a bidirectional Doetz benzannulation reaction to set the dimeric structure of the cardinalins. The oxa-Pictet-Spengler reaction was used to construct the pyran rings. The synthesis is completed in seven steps and an overall yield of 7%.

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Chiral Catalysts,
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METHOD FOR THE SYNTHESIS OF HETEROCYCLIC HYDROGEN PHOSPHINE OXIDE

The present invention is related to a method for the synthesis of a heterocyclic hydrogen phosphine oxide, having the general formula (I), wherein: – R is a aliphatic or aromatic divalent group optionally comprising one or more heteroatoms and optionally comprising one or more substituents and – X and Y are independently selected from -O-, -C(O)O- and -NR’- wherein R’ is a monovalent group optionally comprising one or more heteroatoms comprising the steps of: a) forming a reaction mixture by mixing a compound having the general formula HX-R-YH and tetraphosphorus hexaoxide; b) recovering the resulting compound comprising the heterocyclic hydrogen phosphine oxide.

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Revisiting the Hinsberg reaction: Facile and expeditious synthesis of 3-substituted quinoxalin-2(1H)-ones under catalyst-free conditions in water

Substituted benzene-1,2-diamine reacted with various alpha-keto esters at 50 under mild conditions for 15 min using H2O as reaction medium, providing a variety of 3-substituted quinoxalinone derivatives in excellent yields. The reaction was instantaneous, and products were isolated by simple filtration.

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Chiral Catalysts,
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An efficient and convenient protocol for the synthesis of quinoxalines and dihydropyrazines via cyclization-oxidation processes using HClO4¡¤SiO2 as a heterogeneous recyclable catalyst

A convenient and straightforward method has been developed for the synthesis of quinoxalines and dihydropyrazines (DHPs) using alpha-bromo ketones and 1,2-diamines in the presence of silica supported perchloric acid (HClO4¡¤SiO2) at room temperature. The quinoxalines and DHPs were presumably formed via cyclization-oxidation. The catalyst works under heterogeneous conditions and can be recycled.

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Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn¡¯t involve a screen. 21436-03-3, C6H14N2. A document type is Patent, introducing its new discovery., Product Details of 21436-03-3

Quinoline derivatives for treating malaria

The invention relates to novel quinoline derivatives and their therapeutic use against malaria.

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Chiral Catalysts,
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The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.21436-03-3, Name is (1S,2S)-Cyclohexane-1,2-diamine, molecular formula is C6H14N2. In a Article£¬once mentioned of 21436-03-3, COA of Formula: C6H14N2

The application of quasi-enantiomeric trianglamine macrocycles as chiral probes for anion recognition in ion trap ESI mass spectrometry

This paper reports the synthesis and application of quasi-enantiomeric trianglamine macrocycles for chiral analysis using ion trap ESI mass spectrometry. The quasi-enantiomeric macrocycles were shown to display chiroselection towards a series of enantiomerically pure carboxylic acids and therefore act as chiral probes for anions in the gas phase and in solution.

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Chiral Catalysts,
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Synthesis, crystal structures and photochromic properties of novel chiral Schiff base macrocycles

Enantiomerically pure and racemic forms of calixsalen-type macrocycles 1 and 2 were synthesized and their crystal structures were determined. The enantiomerically pure crystals of (S,S,S,S,S,S)-1 exhibited thermally reversible photochromism from yellow to orange-red upon photoirradiation in the solid state, while rac-crystals of 2 with the guest CH3CN did not show any photocolouration.

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Chiral Catalysts,
Chiral catalysts – SlideShare