Day: May 7, 2021

The transformation of simple hydrocarbons into more complex and valuable products via catalytic C–H bond functionalisation has revolutionised modern synthetic chemistry. An article , which mentions Computed Properties of C3H8O2, molecular formula is C3H8O2. The compound – (S)-Propane-1,2-diol played an important role in people’s production and life., Computed Properties of C3H8O2

SYNPHOS: A new atropisomeric diphosphine ligand. From laboratory-scale synthesis to scale-up development

A new optically active diphosphine ligand, [(5,6),(5?,6?)-bis(ethylenedioxy)biphenyl.2,2?-diyl]bis (diphenylphosphine) (SYNPHOS) has been synthesized. Laboratory-scale synthesis and scale-up development of this ligand are described herein. This new atropisomeric diphosphine was also used in ruthenium-catalyzed asymmetric hydrogenation.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

Synthetic Route of 538-58-9, Chemistry is a science major with cience and engineering. The main research directions are chemical synthesis, new energy materials, nano-ceramics, nano-hybrid composite materials, preparation and modification of special coatings. 538-58-9, Name is 1,5-Diphenylpenta-1,4-dien-3-one,introducing its new discovery.

Double Michael addition of nitromethane to divinyl ketones: A remarkably positive effect of additive

An efficient double Michael addition of nitromethane to divinyl ketones was established in good to high yields (75?99%). A wide range of cyclohexanones were obtained with excellent diastereocontrol (up to >20:1 dr) and enantioinduction (91?99% ee) in a one-pot fashion. The involvement of basic additive significantly enhanced the reactivity of this cascade sequence.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

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Benzylidene ketal derivatives as M2 muscarinic receptor antagonists

Benzylidene ketal derivatives were investigated as selective M2 receptor antagonists for the treatment of Alzheimer’s disease. Compound 10 was discovered to have subnanomolar M2 receptor affinity and 100-fold selectivity against other muscarinic receptors. Also, 10 demonstrated in vivo efficacy in rodent models of muscarinic activity and cognition. (C) 2000 Elsevier Science Ltd.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

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Stereoselective chemoenzymatic synthesis of both enantiomers of protected 4-amino-2-pentanone

An acetal protected 4-amino-2-pentanone was synthesised by two different routes in 10 and seven steps, respectively, the key step being a microbiological reduction. Both enantiomers of the amine were obtained enantiomerically pure.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

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Stereoselectivity of Baker’s yeast reduction of 2-propanones: influence of substituents.

The stereoselectivity of Baker’s yeast reduction of prochiral alpha-oxygenated 2-propanones has been studied by varying the substrate structure. The 1-hydroxy-3-methoxy-3-propanone 1a was reduced to the corresponding alcohol (R)-2a with 88% enantiomeric excess. Replacing the hydroxy group in 1a with phenoxy or benzyloxy (1b and 1c) gave the alcohols (S)-2b and (S)-2c with 53 and 32% ee, respectively. Reduction of the methyl ketone 1d gave the alcohol (S)-2d with 91% ee. Attempts to improve the enantioselectivity of the reduction of 1c by lowering the substrate concentration or addition of selective reductase inhibitors had only small effect on the enantioselectivity.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

Application of 19132-06-0, Irreversible inhibitors are therefore the equivalent of poisons in heterogeneous catalysis. 19132-06-0, Name is (2S,3S)-Butane-2,3-diol, molecular formula is C4H10O2, belongs to chiral-oxygen-ligands compounds. In a Article，once mentioned of 19132-06-0

Energy Well of Diradicals, VII. – Conjugative-Stabilized Trimethylenemethane Derivatives. Geometry Dependance of the Singlet-Triplet Splitting

For the three 2,1′-bis-allyl diradicals 3-5 the singlet-triplet splitting has been determined by the oxygen-trapping technique.In agreement with theory the value for the planar diradical is large (>14 kcal*mol-1) whereas for the orthogonal geometry the energy gap is small (6.3 kcal*mol-1).In all cases a triplet groundstate is observed.From the rotational barrier of the exo methylene groups in 6 it is shown that the interconversion of the planar and orthogonal singlet states have activation barriers (6-9 kcal mol-1) which are responsible for their kinetic stability.In contrast to 6, where the formation of the orthogonal diradical proceeds by way of the planar diradical 3, the formation of the analogous orthogonal diradical 29 from homofulvene 17 is a concerted process.This difference is an important observation with respect to the fundamental understanding of concerted and non-concerted reactions. – Key Words: Diradicals / Gas-phase kinetics / Oxygen trapping / Dynamic gas chromatography / Rotational barrier, two-step

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

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Substituted diether diols by ring-opening of carbocyclic and stannylene acetals

Reduction of malonaldehyde bis(ethylene and propylene acetals) with borane or monochloroborane produces diether diols 1 and 2 in high yield. Similar reduction of glyoxal his(ethylene acetals) has only limited utility for the preparation of tetrasubstituted triethylene glycols 3. Organotin chemistry is complementary: stannylene acetals prepared from disubstituted vicinal diols can be alkylated with half an equivalent of 1,2-dibromoethane to produce tetrasubstituted triethylene glycols 3, or with two equivalents of 2-chloroethanol to produce disubstituted triethylene glycols 4.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

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Chiral MOF incorporating chiral guests: Structural studies and enantiomer-dependent luminescent properties

Two new inclusion compounds of chiral guest molecules in chiral metal?organic framework (MOF) were obtained by soaking the crystalline [Zn2(dmf)(bdc)(S-lac)]·DMF (dmf = N,N-dimethylformamide; bdc = terephthalate; S-lac = S-lactate) in neat R-1,2-propanediol (R-pd) or S-1,2-propanediol (S-pd). Single crystal X-ray analysis for [Zn2(dmf)(bdc)(S-lac)]·R-pd (1) and [Zn2(S-pd)2(bdc)(S-lac)]·S-pd (2) showed that two enantiomers of the same alcohol react quite differently with the chiral porous framework, occupying different positions and form different types of interactions with the host. While the R-pd acts only as a guest molecule inside the channels, the S-pd coordinates to zinc cations of the framework and substitutes both guest and coordinated DMF of the original MOF. The chirality of 1,2-propanediol guest molecules has a considerable effect on luminescent properties of the [Zn2(dmf)(bdc)(S-lac)] host. The luminescence spectra of [Zn2(S-pd)2(bdc)(S-lac)]·S-pd and the original [Zn2(dmf)(bdc)(S-lac)]·DMF are almost identical while the luminescence spectra of [Zn2(dmf)(bdc)(S-lac)]·R-pd features new peak, compared with the original host. Also, the incorporation of alcohol guest molecules has different impact on quantum yields of the luminescence of the host, depending on the chirality of the isomer. In a more general prospect, such enantiomer-dependent luminescent properties of [Zn2(dmf)(bdc)(S-lac)] represent a chiral luminescence sensing, which is quite an extraordinary and rare phenomenon for chiral MOFs.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

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Absolute stereochemistry of amphidinolide C.

[structure in text] The absolute configurations at 12 chiral centers in amphidinolide C (1), a potent cytotoxic 25-membered macrolide isolated from a marine dinoflagellate Amphidinium sp., were determined to be 3S, 4R, 6R, 7R, 8R, 12R, 13S, 16S, 20R, 23R, 24R, and 29S by combination of NMR analyses, degradation experiments, and synthesis of the C-1-C-7 segment.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

As an important bridge between the micro and macro material world, chemistry is one of the main methods and means for humans to understand and transform the material world. Product Details of 4254-15-3, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 4254-15-3

Mixed neutral compounds of palladium(II) and platinum (II) chelated by diolato(2-) and di-imine ligands

The synthesis and characterization are described for compounds abbreviated (a) 1-5: [Pd(phen)(OO)], where OO = the dianion from 1,2-ethanediol (1), (+)-1,2-propanediol (2), (±)-2,3-butanediol (3), (-)-1,2-butanediol (4), catechol (5); (b) the sulphur analogue (6) [Pd(phen)(SCH2CH2S)], from ethane-1,2-dithiol; (c) the platinum analogue (7) [Pt(phen)(OCH2CH2O)]; (d) the 2,2?-bipyridyl analogue (8), [Pd(bipy)(OCH2CH2O)] (phen = 1,10-phenanthroline and bipy = 2,2?-bipyridyl).

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate