The Action of Zinc on the 20,21-Ketol Acetate Group of a Δ16-Pregnene

1951 ◽  
Vol 73 (10) ◽  
pp. 4765-4766 ◽  
Author(s):  
William R. Nes ◽  
Harold L. Mason
Keyword(s):  
Acetate Group

Transition metal acetates

1968 ◽  
Vol 46 (22) ◽  
pp. 3443-3446 ◽  
Author(s):  
D. A. Edwards ◽  
R. N. Hayward
Keyword(s):  
Solid State ◽  
Thermogravimetric Analysis ◽  
Transition Metal ◽  
Infrared Spectra ◽  
Magnetic Moments ◽  
Acetate Group ◽  
Visible Spectra

Some anhydrous transition metal acetates (Mn(II), Co(II), Cu(II), Ni(II), Zn(II), Ag(I), Mo(II), Ce(III), La(III)) have been prepared and their infrared spectra measured in the solid state. The infrared spectra have been related to established modes of bonding of the acetate group to metals. Thermal decompositions of the anhydrous acetates have been investigated by thermogravimetric analysis; magnetic moments and visible spectra have been measured.

An ionic chain mechanism for the substitution of an acetate group by the 2-Nitropropan-2-ide ion in benzylidene diacetates

1976 ◽  
Vol 29 (2) ◽  
pp. 327 ◽  
Author(s):  
DJ Freeman ◽  
PJ Newcombe ◽  
RK Norris
Keyword(s):  
Good Yield ◽  
Dimethyl Sulphoxide ◽  
Acetate Group ◽  
Chain Mechanism ◽  
Elimination Reaction ◽  
Nucleophilic Cleavage ◽  
Enol Acetates ◽  
Subsequent Elimination

The reaction of 16 arylmethylene diacetates [benzylidene diacetates; ArCH(OAc)2] with lithium 2-nitropropan-2-ide in dimethyl sulphoxide has been studied. With the exception of aryl rings bearing strongly electron-donating substituents a ready reaction takes place giving l-aryl-2-methyl-2-nitropropyl acetates in good yield. The mechanism of this reaction, in which an acetate group is formally substituted by a (CH3)2C(N02) group, has been shown to be an ionic chain mechanisminvolving nucleophilic cleavage of the diacetate to catalytic quantities of the corresponding arene carbaldehyde (ArCHO) which subsequently undergoes a Henry condensation followed by a transacetylation reaction. In some cases (nitro heteroaromatic derivatives) a subsequent elimination reaction gives enol-acetates [ArC(OAc)=C(CH3)2].

scholarly journals Synthesis of Streptococcus pneumoniae serotype 9V oligosaccharide antigens

2020 ◽  
Vol 16 ◽  
pp. 1693-1699
Author(s):  
Sharavathi G Parameswarappa ◽  
Claney L Pereira ◽  
Peter H Seeberger
Keyword(s):  
Streptococcus Pneumoniae ◽  
Conjugate Vaccine ◽  
Virulence Factor ◽  
Capsular Polysaccharide ◽  
Acetate Group ◽  
Synthetic Strategy ◽  
Invasive Diseases ◽  
Glycoconjugate Vaccines

Streptococcus pneumoniae (SP) bacteria cause serious invasive diseases. SP bacteria are covered by a capsular polysaccharide (CPS) that is a virulence factor and the basis for SP polysaccharide and glycoconjugate vaccines. The serotype 9V is part of the currently marketed conjugate vaccine and contains an acetate modification. To better understand the importance of glycan modifications in general and acetylation in particular, defined oligosaccharide antigens are needed for serological and immunological studies. Here, we demonstrate a convergent [2 + 3] synthetic strategy to prepare the pentasaccharide repeating unit of 9V with and without an acetate group at the C-6 position of mannosamine.

scholarly journals Crystal structure of methyl 1-allyl-4-methyl-1H-benzo[c][1,2]thiazine-3-carboxylate 2,2-dioxide

2016 ◽  
Vol 72 (11) ◽  
pp. 1574-1576 ◽  
Author(s):  
Liliana Azotla-Cruz ◽  
Svitlana Shishkina ◽  
Igor Ukrainets ◽  
Irina Lijanova ◽  
Natalya Likhanova
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Acetate Group ◽  
Axis Direction ◽  
Π Interactions ◽  
Compound C ◽  
The Mean

In the title compound, C14H15NO4S, the dihydrothiazine ring adopts a distorted sofa conformation with the S atom displaced from the mean plane through the N and C ring atoms by 0.767 (1) Å. The allyl substituent (C—C=C) is inclined to this mean plane by 78.5 (7)° and the acetate group [C(=O)—O—C] by 66.5 (3)°. In the crystal, molecules are linked by C—H...π interactions forming chains propagating along thea-axis direction.

Facile Access to 1,5-Benzodiazepines via Amine-Promoted (4+3) Annulations of δ-Acetoxy Allenoates with o-Diaminobenzenes under Mild Conditions

Synlett ◽  
2018 ◽  
Vol 29 (09) ◽  
pp. 1176-1180 ◽  
Author(s):  
Yi-Fan Wang ◽  
Cheng-Yu He ◽  
Longlei Hou ◽  
Ping Tian ◽  
Guo-Qiang Lin ◽  
...  
Keyword(s):  
Michael Addition ◽  
Cascade Reaction ◽  
Acetate Group ◽  
Mild Conditions

An amine-promoted (4+3) annulation of δ-acetoxy allenoate with o-diaminobenzene is reported, providing a facile access to 1,5-benzodiazepine. This method features wide reaction scope, mild conditions, and readily available starting materials. The cascade reaction involves aza-Michael addition of o-diaminobenzene to allenoate, elimination of acetate group, and subsequent 1,6-aza-Michael addition.

scholarly journals 1,2,3,4,5,6-Hexa-O-acetyl-scyllo-inositol

2012 ◽  
Vol 68 (8) ◽  
pp. o2594-o2594
Author(s):  
Rajni Kant ◽  
Vivek K. Gupta ◽  
Kamini Kapoor ◽  
Renu Chib ◽  
Bhahwal A. Shah ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Chair Conformation ◽  
Cyclohexane Ring ◽  
Acetate Group ◽  
Mirror Plane ◽  
Torsion Angles ◽  
Title Molecule ◽  
A Chain

The title molecule, C18H24O12, has crystallographic 2/msymmetry with two acetate group located on a mirror plane. The H—Csp3—O—Csp2torsion angles characterizing orientation of the acetyl groups with respect to the cyclohexane ring are 0.0, 23.9 and −23.9°. The cyclohexane ring is in a chair conformation with all substituents in equatorial positions. In the crystal, molecules are connected through C—H...O hydrogen bonds into a chain extending along thecaxis.

Bioisosteric Approach to Elucidation of Binding of the Acetate Group of a Moth Sex Pheromone Component to Its Receptor

1997 ◽  
Vol 23 (12) ◽  
pp. 2755-2776 ◽  
Author(s):  
Anna-Lena Gustavsson ◽  
Malena Tuvesson ◽  
Mattias C. Larsson ◽  
Wu Wenqi ◽  
Bill S. Hansson ◽  
...  
Keyword(s):  
Sex Pheromone ◽  
Pheromone Component ◽  
Acetate Group

scholarly journals Ethyl 2-(6-nitro-2H-indazol-2-yl)acetate

IUCrData ◽  
2016 ◽  
Vol 1 (7) ◽  
Author(s):  
Fatima-Zahra Rejouani ◽  
Souad Mojahidi ◽  
El Mostapha Rakib ◽  
Abdelouahed Mdeghri Alaoui ◽  
Mohamed Saadi ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Nitro Group ◽  
Dihedral Angle ◽  
Title Compound ◽  
Acetate Group ◽  
Compound C ◽  
The Mean

In the title compound, C11H11N3O4, the indazolyl ring and the nitro group are nearly coplanar, with the greatest deviation from their mean plane being 0.103 (2) Å. The mean plane through the acetate group is almost perpendicular to the indazolyl ring, subtending a dihedral angle of 88.05 (7)°. In the crystal, molecules are linked by C—H...O and C—H...N non-classical hydrogen bonds to form supramolecular layers that stack along theaaxis.

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