Bulky substituent and solvent-induced alternative nodes for layered Cd–isophthalate/acylhydrazone frameworks

CrystEngComm ◽  
2018 ◽  
Vol 20 (20) ◽  
pp. 2841-2849 ◽  
Author(s):  
Kornel Roztocki ◽  
Magdalena Lupa ◽  
Maciej Hodorowicz ◽  
Irena Senkovska ◽  
Stefan Kaskel ◽  
...  
Keyword(s):  
Bulky Substituent

A series of three layered cadmium–organic frameworks containing acylhydrazone and (un)substituted isophthalates have been prepared and characterised.

scholarly journals Synthesis of new pyrrolidine-based organocatalysts and study of their use in the asymmetric Michael addition of aldehydes to nitroolefins

2017 ◽  
Vol 13 ◽  
pp. 612-619 ◽  
Author(s):  
Alejandro Castán ◽  
Ramón Badorrey ◽  
José A Gálvez ◽  
María D Díaz-de-Villegas
Keyword(s):  
Michael Addition ◽  
Bulky Substituent ◽  
Asymmetric Michael Addition ◽  
Iodination Reaction ◽  
Chiral Imines ◽  
New Compounds ◽  
The Michael Addition

New pyrrolidine-based organocatalysts with a bulky substituent at C2 were synthesized from chiral imines derived from (R)-glyceraldehyde acetonide by diastereoselective allylation followed by a sequential hydrozirconation/iodination reaction. The new compounds were found to be effective organocatalysts for the Michael addition of aldehydes to nitroolefins and enantioselectivities up to 85% ee were achieved.

Synthesis and Conformational Study of Optically Active Poly(phenylacetylene) Derivatives Bearing a Bulky Substituent

1995 ◽  
Vol 28 (12) ◽  
pp. 4184-4193 ◽  
Author(s):  
Eiji Yashima ◽  
Songlin Huang ◽  
Teruyuki Matsushima ◽  
Yoshio Okamoto
Keyword(s):  
Optically Active ◽  
Bulky Substituent ◽  
Conformational Study

Nuclear magnetic resonance studies. III. Rotational isomerism of some C-glucosylflavonoid acetates

1965 ◽  
Vol 18 (5) ◽  
pp. 715 ◽  
Author(s):  
RA Eade ◽  
WE Hillis ◽  
DHS Horn ◽  
JJH Simes
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Steric Hindrance ◽  
Chemical Shifts ◽  
Rotational Isomerism ◽  
Bulky Substituent ◽  
Temperature Dependent ◽  
Magnetic Resonance Studies ◽  
Rotational Isomers ◽  
Nuclear Magnetic

The temperature-dependent variations in the spectra of certain C-glucosyl-flavonoid acetates are attributed to the effect of steric hindrance of bulky substituent groups of the sugar and aromatic moieties on the rate of interconversion of the two rotational isomers present. The differences in the chemical shifts of the protons of the two isomers are attributed to differences in the orientation and position of the acetyl and phenyl groups.

Optically Pure Aminopolyols and Polyoxamic Acid Derivatives from Aziridine-2-carboxylates

1999 ◽  
Vol 52 (4) ◽  
pp. 259 ◽  
Author(s):  
Heribert Dollt ◽  
Volker Zabel
Keyword(s):  
Solvent Effects ◽  
Michael Addition ◽  
Building Blocks ◽  
Bulky Substituent ◽  
Cis And Trans ◽  
Optically Pure ◽  
The Michael Addition

Various new chiral building blocks could easily be prepared from optically pure cis and trans ethyl 3-(1′,3′- dioxolan-4′-yl)aziridine-2-carboxylates. A stereochemically pure 1,3-dioxolan in the allyl position of an α-bromoacrylate induced a high (3R*,4′S*) selectivity in the Michael addition with an amine. After oxygen at the inducing centre was exchanged with nitrogen bearing a bulky substituent, the directing influence of this new group was examined. Solvent effects influencing the cis/trans ratio of aziridine formation are discussed.

scholarly journals Novel Unsymmetrical Ru(III) and Mixed-valence Ru(III)/Ru(II) Dinuclear Compounds Related to the Antimetastatic Ru(III) Drug NAMI-A

2001 ◽  
Vol 8 (1) ◽  
pp. 9-18 ◽  
Author(s):  
B. Serli ◽  
E. Iengo ◽  
T. Gianferrara ◽  
E. Zangrando ◽  
E. Alessio
Keyword(s):  
Ascorbic Acid ◽  
Mixed Valence ◽  
Physiological Solution ◽  
The Other ◽  
Synthetic Approach ◽  
Bulky Substituent ◽  
Chemical Behavior ◽  
Complete Reduction ◽  
Dinuclear Compounds

In this paper we report the stepwise preparation and the characterization of new unsymmetrical monoanionic Ru(III) dinuclear compounds, [NH4][{trans-RuCl4(Me2SO-S)}(μ-L){mer-RuCl3(Me2SO-S)(Me2SO-O)}] (L = pyz (1), pym (2)). By a similar synthetic approach we also prepared new mixed-valence Ru(III)/Ru(II) dinuclear compounds of formula [NH4][{trans-RuCl4(Me2SO-S)}(μ-pyz){cis,cis,cis-RuCl2(Me2SO-S)2(CO)}] (L = pyrazine (pyz, 3), pyrimidine (pym, 4)). Moreover, we describe the chemical behavior of compounds 1-4 in physiological solution, also after complete reduction (with ascorbic acid) to the corresponding Ru(II)/Ru(II) species. Overall, the chemical behavior of 1 and 2 after reduction resembles that of the corresponding dianionic and neutral dinuclear species, [{trans-RuCl3(Me2SO-S)}2(μ-L)]2− and [{mer-RuCl3(Me2SO-S)(Me2SO-O)}2 (μ-L)]. On the other hand, the mixed-valence dinuclear compounds 3 and 4, owing to the great inertness of the cis,cis,cis-RuCl2(Me2SO-S)2(CO)(1/2μ-L) fragment, behave substantially like the mononuclear species [trans-RuCl4(Me2SO-S)(L)]− in which the terminally bonded L ligand can be considered as bearing a bulky substituent on the other N atom.

ChemInform Abstract: Formation of Kinetically Stabilized Dithiiranes by Treating Thione S-Oxides Bearing a Bulky Substituent with Lawesson′s Reagent.

ChemInform ◽  
2010 ◽  
Vol 30 (46) ◽  
pp. no-no
Author(s):  
Kazuaki Shimada ◽  
Keiichi Kodaki ◽  
Shigenobu Aoyagi ◽  
Yuji Takikawa ◽  
Chizuko Kabuto
Keyword(s):  
Bulky Substituent

scholarly journals No Evidence of the Monomer in the Extraction of Copper(II) with Carboxylic Acids Having Bulky Substituent at .ALPHA.-Position.

1997 ◽  
Vol 13 (6) ◽  
pp. 913-919 ◽  
Author(s):  
Yoshio MORIYA ◽  
Nobuaki OGAWA ◽  
Mikio SUGAI ◽  
Yozo OHSHIMA
Keyword(s):  
Carboxylic Acids ◽  
Bulky Substituent
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