Direct Hydrolysis of Hydrated Organotin Cations:  Synthesis and Structural Characterization of {[n-Bu2Sn(OH2)(Phen)(O3SC6H3-2,5-Me2)]+[2,5-Me2C6H3SO3]-} (Phen = 1,10-phenanthroline) and {[n-Bu2Sn(μ-OH)(O3SC6H3-2,5-Me2)]2}n

2007 ◽  
Vol 26 (11) ◽  
pp. 2833-2839 ◽  
Author(s):  
Vadapalli Chandrasekhar ◽  
Puja Singh ◽  
Kandasamy Gopal
Keyword(s):  
Structural Characterization ◽  
Hydrolysis Of ◽  
Direct Hydrolysis

Synthesis and Structural Characterization of a Terminal Hydroxide Containing Alumoxane via Hydrolysis of Aluminum Hydrides

2004 ◽  
Vol 43 (4) ◽  
pp. 1217-1219 ◽  
Author(s):  
Ying Peng ◽  
Guangcai Bai ◽  
Hongjun Fan ◽  
Denis Vidovic ◽  
Herbert W. Roesky ◽  
...  
Keyword(s):  
Structural Characterization ◽  
Aluminum Hydrides ◽  
Hydrolysis Of

scholarly journals Synthesis, structures and reduction chemistry of monophthalocyanine scandium hydroxides

2019 ◽  
Vol 23 (11n12) ◽  
pp. 1592-1602 ◽  
Author(s):  
Yumeela Ganga-Sah ◽  
Elahe Tajbakhsh ◽  
Rachel H. Platel ◽  
Wen Zhou ◽  
Daniel B. Leznoff
Keyword(s):  
Alkali Metal ◽  
Dihedral Angles ◽  
Ambient Atmosphere ◽  
Metal Alkoxides ◽  
Metal Free ◽  
H Nmr ◽  
Vis Spectroscopy ◽  
Hydrolysis Of ◽  
Direct Hydrolysis

The preparation and structural characterization of a pair of scandium(III) phthalocyanine hydroxide complexes were achieved by reaction of PcScCl with alkali metal alkoxides, likely via hydrolysis of soluble PcSc-alkoxide intermediates. A Sc[Formula: see text]Li[Formula: see text]-OH)[Formula: see text] cubane supported by two distorted Pc rings of the form (PcSc)[Formula: see text]-OH)[Formula: see text]Li[Formula: see text](THF)(DME) was isolated from the reaction of PcScCl with LiO[Formula: see text]Pr, while a simpler alkali-metal-free [Pc[Formula: see text]Sc[Formula: see text]-OH)[Formula: see text](THF)] was obtained from addition of NaO[Formula: see text]Bu; both structures are reminiscent of bent metallocenes, with dihedral angles between the two Pc rings of 50.8 and 37.7[Formula: see text]respectively. A soluble PcScOH material can also be obtained directly via hydrolysis of insoluble PcScCl in approximately 95:5 THF:water. Reduction of the Pc ring of PcScCl using KC[Formula: see text] is reversible and generates Pc[Formula: see text] and Pc[Formula: see text]-containing materials that were characterized via UV-vis spectroscopy and, where appropriate EPR and [Formula: see text]H NMR spectroscopy; analogous reductions of the PcScOH-based species were irreversible. Exposure of the air-sensitive, reduced PcScCl-based species to ambient atmosphere generated PcScOH materials analogous to the direct hydrolysis route.

scholarly journals Characterization of O-Acetylation of N-Acetylglucosamine

2011 ◽  
Vol 286 (27) ◽  
pp. 23950-23958 ◽  
Author(s):  
Elvis Bernard ◽  
Thomas Rolain ◽  
Pascal Courtin ◽  
Alain Guillot ◽  
Philippe Langella ◽  
...  
Keyword(s):  
Cell Wall ◽  
Structural Characterization ◽  
Bacterial Species ◽  
Muramic Acid ◽  
Gram Positive Bacteria ◽  
Mutant Strains ◽  
Encoding Genes ◽  
Hydrolysis Of ◽  
Cell Wall Hydrolysis

Peptidoglycan (PG) N-acetyl muramic acid (MurNAc) O-acetylation is widely spread in Gram-positive bacteria and is generally associated with resistance against lysozyme and endogenous autolysins. We report here the presence of O-acetylation on N-acetylglucosamine (GlcNAc) in Lactobacillus plantarum PG. This modification of glycan strands was never described in bacteria. Fine structural characterization of acetylated muropeptides released from L. plantarum PG demonstrated that both MurNAc and GlcNAc are O-acetylated in this species. These two PG post-modifications rely on two dedicated O-acetyltransferase encoding genes, named oatA and oatB, respectively. By analyzing the resistance to cell wall hydrolysis of mutant strains, we showed that GlcNAc O-acetylation inhibits N-acetylglucosaminidase Acm2, the major L. plantarum autolysin. In this bacterial species, inactivation of oatA, encoding MurNAc O-acetyltransferase, resulted in marked sensitivity to lysozyme. Moreover, MurNAc over-O-acetylation was shown to activate autolysis through the putative N-acetylmuramoyl-l-alanine amidase LytH enzyme. Our data indicate that in L. plantarum, two different O-acetyltransferases play original and antagonistic roles in the modulation of the activity of endogenous autolysins.

Controlled hydrolysis of aryltellurium trichlorides using 2-pyrrolidinones: isolation and structural characterization of monomeric aryltellurium(IV) monohydroxides

RSC Advances ◽  
2011 ◽  
Vol 1 (5) ◽  
pp. 808 ◽  
Author(s):  
Shafalika Misra ◽  
Ashok K. S. Chauhan ◽  
Ramesh C. Srivastava ◽  
Andrew Duthie ◽  
R. J. Butcher
Keyword(s):  
Structural Characterization ◽  
Hydrolysis Of ◽  
Controlled Hydrolysis

Hydrolysis of tri-tert-butylaluminum: the first structural characterization of alkylalumoxanes [(R2Al)2O]n and (RAlO)n

1993 ◽  
Vol 115 (12) ◽  
pp. 4971-4984 ◽  
Author(s):  
Mark R. Mason ◽  
Janna M. Smith ◽  
Simon G. Bott ◽  
Andrew R. Barron
Keyword(s):  
Structural Characterization ◽  
Hydrolysis Of

Structural Characterization of Gels Prepared from Co-Hydrolysis of Tetraethoxysilane and Dimethyldiethoxysilane.

1992 ◽  
Vol 271 ◽  
Author(s):  
Florence Babonneau ◽  
Laurence Bois ◽  
Jacques Livage
Keyword(s):  
Structural Characterization ◽  
Silica Gels ◽  
Condensation Process ◽  
Modified Silica ◽  
Polymeric Gels ◽  
Organically Modified ◽  
Organically Modified Silica ◽  
Hydrolysis Of ◽  
Modified Silica Gels

ABSTRACTThis work is part of a more general study on the structural characterization of organically modified silica gels that are usually prepared from tetrafunctional, trifunctional and difunctional alkoxides. The systems that were investigated in this paper are gels prepared from co-hydrolysis of dimethyldiethoxysilane (DEDMS) and tetraethoxysilane (TEOS). The condensation process was followed by 29Si and 17O liquid NMR and shows clearly evidence for co-condensation reactions. Gels with various DEDMS/TEOS ratios were studied by 29Si and 1H MAS-NMR. The results are clearly correlated to the change in physical properties of the materials, from flexible polymeric gels at high DEDMS content to crosslinked brittle networks at low DEDMS content.

Sign in / Sign up

Export Citation Format

Share Document