Methane Oxidation by Aqueous Osmium Tetroxide and Sodium Periodate: Inhibition of Methanol Oxidation by Methane

2006 ◽  
Vol 45 (44) ◽  
pp. 7433-7436 ◽  
Author(s):  
Takao Osako ◽  
Eric J. Watson ◽  
Ahmad Dehestani ◽  
Brian C. Bales ◽  
James M. Mayer
Keyword(s):  
Methane Oxidation ◽  
Methanol Oxidation ◽  
Osmium Tetroxide ◽  
Sodium Periodate

Methane Oxidation by Aqueous Osmium Tetroxide and Sodium Periodate: Inhibition of Methanol Oxidation by Methane

2006 ◽  
Vol 118 (44) ◽  
pp. 7593-7596 ◽  
Author(s):  
Takao Osako ◽  
Eric J. Watson ◽  
Ahmad Dehestani ◽  
Brian C. Bales ◽  
James M. Mayer
Keyword(s):  
Methane Oxidation ◽  
Methanol Oxidation ◽  
Osmium Tetroxide ◽  
Sodium Periodate

Studies in the Cycloproparene Series: The Behavior of Alkylidenecycloproparenes Towards Nucleophiles and Oxidizing Agents

1988 ◽  
Vol 41 (6) ◽  
pp. 845 ◽  
Author(s):  
SJ Buckland ◽  
B Halton ◽  
PJ Stang
Keyword(s):  
Osmium Tetroxide ◽  
Sodium Periodate ◽  
Hydroxy Ketone ◽  
Initial Formation ◽  
Oxidizing Agents

The alkylidenecycloproparene (1) reacts with potassium t- butoxide to give the ring-expanded heptafulvene (3). Epoxidation of (1) provides the hydroxy ketone (5) probably via the spiro epoxide (4) but carbene additions fail to give spirocycle (7). Photooxygenation of (1a,b) gives products (5),(12)-(14) and (16) which are explicable in terms of initial formation of dioxetan (10); products (13) and (14) result from 1H-cyclopropa[b] naphthalenone (11). By comparison (1c) provides phenanthraquinone acetal (17) in low yield. With osmium tetroxide and sodium periodate , (1a) gives benzophenone (12a) in competition with hydroxy ketone (5a) and 2,2-diphenylcyclobutanaphthalenone (20). The modes of formation of the various products are discussed.

ChemInform Abstract: Cleavage of Olefins (I) by Polymer-Supported Osmium Tetroxide and Sodium Periodate.

ChemInform ◽  
1989 ◽  
Vol 20 (23) ◽  
Author(s):  
G. CAINELLI ◽  
M. CONTENTO ◽  
F. MANESCALCHI ◽  
L. PLESSI
Keyword(s):  
Osmium Tetroxide ◽  
Sodium Periodate ◽  
Polymer Supported

Cleavage of Olefins by Polymer-Supported Osmium Tetroxide and Sodium Periodate

Synthesis ◽  
1989 ◽  
Vol 1989 (01) ◽  
pp. 47-48 ◽  
Author(s):  
Gianfranco Cainelli ◽  
Michele Contento ◽  
Francesco Manescalchi ◽  
Laura Plessi
Keyword(s):  
Osmium Tetroxide ◽  
Sodium Periodate ◽  
Polymer Supported

Synthesis and antiviral activity of stereoisomeric eritadenines

1982 ◽  
Vol 47 (5) ◽  
pp. 1392-1407 ◽  
Author(s):  
Antonín Holý ◽  
Ivan Votruba ◽  
Erik De Clercq
Keyword(s):  
Antiviral Activity ◽  
Acid Hydrolysis ◽  
Vesicular Stomatitis Virus ◽  
Sodium Borohydride ◽  
Osmium Tetroxide ◽  
Sodium Periodate ◽  
Parainfluenza Virus ◽  
Racemic Mixture ◽  
Isopropylidene Derivative ◽  
Vesicular Stomatitis

D-Eritadenine (Ia) and L-eritadenine (IIa) were prepared from 5-(adenin-9-yl)-5-deoxyaldofuranoses or enantiomeric 2,3-disubstituted erythronolactones (VIIIb, c, XIV). Oxidation of methyl 2,3-O-isopropylidene-D-ribofuranoside (IX) with periodate in the presence of ruthenium, followed by acid hydrolysis and reduction with sodium borohydride, afforded L-ribonolactone (XI). Its 2,3-O-isopropylidene derivative was subjected to alkaline hydrolysis, followed by oxidation with periodate, reduction with sodium borohydride and reaction with cyclohexanone to give 2,3-O-cyclohexylidene-L-erythronolactone (XIV). Condensation of [U-14C]-adenine with VIIIb, followed by acid hydrolysis, afforded [U-14C-adenine]-D-eritadenine. The threo-eritadenines III and IV were prepared by oxidation of 1-(adenin-9-yl)-1-deoxy-2,3-O-isopropylidenethreitols XVI and XVII with sodium periodate in the presence of ruthenium, followed by acid hydrolysis. Reaction of 9-(2,2-diethoxyethyl)adenine (XIX) with malonic acid gave 4-(adenin-9-yl)-3-butenoic acid (XXI); its methyl ester XXII, prepared by treatment with methanol, was isomerized with triethylamine to give methyl 4-(adenin-9-yl)-2-butenoate (XXIII). Hydroxylation of XXIII with osmium tetroxide afforded the racemic mixture of D- and L-threo-eritadenine (III+ IV). Eritadenines Ia and IIa were active against vaccinia, measles and vesicular stomatitis virus. Eritadenine Ia was also effective against reo- and parainfluenza virus. In general, the antiviral activity of the eritadenines decreased in the order D-erythro (Ia) > L-erythro (IIa) > D- and L-threo (III, IV).

Periodate Treatment and “All-or-None” Dehydrogenase Staining Phenomena

1968 ◽  
Vol 26 ◽  
pp. 12-13
Author(s):  
C. G. Rosa
Keyword(s):  
Mitochondrial Membrane ◽  
Osmium Tetroxide ◽  
Sodium Periodate ◽  
Staining Pattern ◽  
Succinic Dehydrogenase ◽  
Positive Contrast ◽  
Uranyl Acetate ◽  
Middle Piece ◽  
Periodate Treatment ◽  
Membrane Stabilizer

It has been shown that when suspensions of fresh rodent sperm are incubated in the presence of tetranitro-blue tetrazolium (TNBT) and stained for succinic dehydrogenase (SDH),this enzyme is localized in the mitochondria of the middle-piece. Rat and mouse spermatozoa treated in this manner and postfixed (suspension) in 4°C Millonig's osmium tetroxide for brief periods demonstrate SDH reactivity in mitochondrial profiles that indicate no SDH, almost complete activity, or most commonly, intermediate staining reactions in the internal membranes (Figure 1). In the last instance, the cristal membranes display a heterogeneous formazan (reduced TNBT) staining pattern not in agreement with the Seligman “all-or-none” hypothesis concerning mitochondrial oxidative enzymatic reactivity.In order to test this hypothesis and circumvent some of the attendant difficulties in these procedures (penetration of reaction mixture components, fixatives), all cytochemical reactions and postfixation were performed on suspensions of sperm from the cauda epididymides of mature rats. An attempt was made to divorce electron densities due to osmium postfixation by employing 1% aqueous sodium periodate (pH 3-4) as a mitochondrial membrane stabilizer through the embedding procedures. Previous use of this treatment allowed preservation of the membranes of these organelles in positive contrast as evidenced by uranyl acetate staining of sectioned material (Figures 2 & 3).

Sodium Periodate-Osmium Tetroxide

2012 ◽  
Author(s):  
Andrew G. Wee ◽  
Baosheng Liu ◽  
Zhendong Jin ◽  
Aashay K. Shah
Keyword(s):  
Osmium Tetroxide ◽  
Sodium Periodate

Cellular Contacts Within the Interhemal Membrane of the Rat Placenta at Term

1974 ◽  
Vol 32 ◽  
pp. 146-147
Author(s):  
William P. Jollie
Keyword(s):  
Osmium Tetroxide ◽  
Uranyl Acetate ◽  
Capillary Endothelium ◽  
En Bloc ◽  
Aldehyde Fixation ◽  
Chorioallantoic Placenta

By routine EM preparative techniques, the tissues which, collectively, separate maternal and fetal bloods in the fully formed chorioallantoic placenta of the rat have been shown to consist of three chorionic layers, or trophoblast, and a layer of allantoic capillary endothelium [Fig. 1]. Relationships between these layers are best demonstrated by special techniques, viz., cacodylate-buffered aldehyde fixation, collidine-buffered osmium tetroxide postfixation, and en bloc staining with uranyl acetate. By using this method on placentas at term, the cells of the outermost chorionic layer (Trophoblast 1) appear to be attached to each other by means of maculae adherentes which sometimes occur in clusters [Fig. 2].

The Ultrastructure of Myocardial Cells in Normal and Cardiac Lethal Mutant Mexican Axolotls, (Ambystoma Mexicanum)

1970 ◽  
Vol 28 ◽  
pp. 62-63
Author(s):  
Larry F. Lemanski ◽  
Eldridge M. Bertke ◽  
J. T. Justus
Keyword(s):  
Fine Structure ◽  
Heart Development ◽  
Osmium Tetroxide ◽  
Picric Acid ◽  
Ambystoma Mexicanum ◽  
Recessive Mutation ◽  
Acid Mixture ◽  
Myocardial Cells ◽  
Lethal Mutant ◽  
Mexican Axolotl

A recessive mutation has been recently described in the Mexican Axolotl, Ambystoma mexicanum; in which the heart forms structurally, but does not contract (Humphrey, 1968. Anat. Rec. 160:475). In this study, the fine structure of myocardial cells from normal (+/+; +/c) and cardiac lethal mutant (c/c) embryos at Harrison's stage 40 was compared. The hearts were fixed in a 0.1 M phosphate buffered formaldehyde-glutaraldehyde-picric acid-styphnic acid mixture and were post fixed in 0.1 M s-collidine buffered 1% osmium tetroxide. A detailed study of heart development in normal and mutant embryos from stages 25-46 will be described elsewhere.

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