Polarography of some coordination compounds of Platinum. III. Ions of the tetrammineplatinum(II) type

1956 ◽  
Vol 9 (1) ◽  
pp. 14 ◽  
Author(s):  
JR Hall ◽  
RA Plowman
Keyword(s):  
Trans Isomer ◽  
Coordination Compounds ◽  
Supporting Electrolyte ◽  
Mercury Electrode ◽  
Trans Isomers ◽  
Cis And Trans Isomers ◽  
Current Voltage ◽  
Dropping Mercury Electrode ◽  
Divalent Platinum ◽  
Cis And Trans

A number of tetrammine ions of divalent platinum, in which the ligands were ammonia, methylamine, dimethylamine, ethylenediamine, pyridine, aniline, and combinations of some of these, were studied at the dropping mercury electrode. Some of the ions showed maxima in their current-voltage curves (c-v curves). The formation of hydrogen interfered with the c-v curves of other ions, so that limiting currents were not obtainable. A method was devised for the measurement of a voltage by means of which the ease of reduction of the ions could be compared. Using a supporting electrolyte of 0.1M KCl and 0.01% gelatin, the order of increasing ease of reduction was found to be [Pt{(CH3)2NH)4]2+ = [Pt(NH3)4]2+ = [Pt(NH3)3(C5H5N)]2+ = [Pt{C2H4(NH2)2}2]2+ < cis-[Pt(NH3)2(C5H5N)2]2+ < trans-[Pt(NH3)2C5H5N)2]2+ < [Pt(CH3NH2)4]2+ = [Pt(NH3)(C5H5N)3]2+ <[Pt(C6H5N)4]2+ < cis-[Pt(NH3)2(C6H5NH2)2]2+ < trans-[Pt(NH3)2(C6H5NH2)2]2+. When the ammonia groups of [Pt(NHS),l2+ were successively replaced by pyridine groups, the resulting e-v curves shifted progressively to more positive voltages. It was also found that cis- and trans-isomers of [PtA,B,I2+ reduced at different voltages. The trans-isomer reduced more readily.

Sur la réduction de polyméthyldihydro-2,3 phénalènones-1 par l'hydrure de lithium et d'aluminium

1974 ◽  
Vol 52 (17) ◽  
pp. 3106-3112 ◽  
Author(s):  
E. Costakis ◽  
P. Canonne ◽  
R. St-Jean
Keyword(s):  
Trans Isomer ◽  
Lithium Aluminum Hydride ◽  
Aluminum Hydride ◽  
Considerable Extent ◽  
Lithium Aluminum ◽  
Trans Isomers ◽  
Cis And Trans Isomers ◽  
Cis And Trans ◽  
Cis Isomer ◽  
Steric Constraints

The reduction of some polymethyl-2,3-dihydro phenalen-1-ones by lithium aluminum hydride yields a mixture of cis and trans isomers; the percentage of each isomer depends to a considerable extent on its structure. Indeed, for some, the trans isomer predominates while for others the cis isomer is obtained in up to 88% yields. Moreover, in the particular case in which the trans isomer is formed in low yields, its preferred conformation is trans diaxial.The steric constraints which render certain transition states unfavourable during the attack of the hydride are discussed with the aid of spectroscopic data on the alcohols obtained. [Journal translation]

Polarography of some coordination compounds of platinum. IV. Compounds of platinum(II) containing 1,10-Phenanthroline

1956 ◽  
Vol 9 (2) ◽  
pp. 143 ◽  
Author(s):  
JR Hall ◽  
RA Plowman
Keyword(s):  
Coordination Compounds ◽  
Supporting Electrolyte ◽  
Mercury Electrode ◽  
The Other ◽  
Ion Concentration ◽  
Metallic Platinum ◽  
Dropping Mercury Electrode ◽  
Adsorption Phenomena ◽  
Complex Ion

Four ions were studied at the dropping mercury electrode. They were [Pt(ophen)2]2+, [Pt(ophen)(en)]2+, [Pt(ophen)(py)2]2+, and [Pt(ophen)(py)Cl]+, where ophen= 1,10- phenanthroline, en=ethylenediamine, and py=pyridine. The shapes of the c-v curves of the ions in supporting electrolyte 0.1M KCl, were dependent on complex ion concentration. Adsorption phenomena occurred with some ions but the effects decreased as the complex ion concentration decreased. The reduction of [Pt(ophen)2]2+ produced evidence for compounds of platinum with valency less than two. Reduction of the other ions appeared to proceed directly to metallic platinum.

SYNTHESES IN THE TERPENE SERIES: VIII. SYNTHESIS OF THE CIS- AND TRANS-ISOMERS OF 7,7,10-TRIMETHYLDECAL-1-ONE. A CONVENIENT MODIFICATION OF THE BROWN HYDRATION REACTION

1959 ◽  
Vol 37 (11) ◽  
pp. 1870-1880 ◽  
Author(s):  
Franz Sondheimer ◽  
Saul Wolfe
Keyword(s):  
Trans Isomer ◽  
Raney Nickel ◽  
Equilibrium Mixture ◽  
Hydration Reaction ◽  
Trans Isomers ◽  
Perbenzoic Acid ◽  
Cis And Trans Isomers ◽  
Cis And Trans

7,7,10-Trimethyl-Δ1(9)-octal-2-one (VII) was converted to the cycloethylenedithioketal (VIII), which on Raney nickel reduction yielded 7,7,10-trimethyl-Δ1(9)-octalin (IX). Oxidation with perbenzoic acid led to the corresponding oxide (X), which could be rearranged in low yield to an equilibrium mixture of 7,7,10-trimethyldecal-1-one consisting essentially of the trans-isomer (XI).A convenient modification of the Brown hydration reaction is described, whereby the necessity of generating diborane or of using diglyme is avoided. 7,7,10-Trimethyl-Δ1(9)-octalin (IX) on Brown hydration using this modification stereospecifically furnished 7,7,10β-tri-methyl-cis-decal-1β-ol (XII), which was oxidized to 7,7,10-trimethyl-cis-decal-1-one (XIII). Isomerization resulted in the above-described equilibrium mixture containing at least 90% of the trans-isomer (XI). Similarly, the previously described 10-methyl-Δ1(9)-octalin (XVI) yielded a mixture of the cis- and trans-isomers of 10-methyldecal-1-one (XIX). Syntheses of 2-methylene-7,7,10-trimethyl-Δ1(9)-octalin (XIV) and of 7,7,10-trimethyl-cis-decal-2,3-dione 3-dithiotrimethylene ketal (XXII) are also described.

Reactions of Alkynes with Dicarbonyl(η-cyclopentadienyl)iridium

1979 ◽  
Vol 32 (10) ◽  
pp. 2147 ◽  
Author(s):  
PA Corrigan ◽  
RS Dickson
Keyword(s):  
Trans Isomer ◽  
Spectroscopic Data ◽  
Spectroscopic Properties ◽  
Organometallic Complexes ◽  
Trans Isomers ◽  
Cis And Trans Isomers ◽  
Cis And Trans ◽  
Related Reaction ◽  
Cis Isomer

Six organometallic complexes have been isolated from the reaction between (η-C5H5)Ir(C0)2 and hexafluorobut-2-yne at 120-160�. Both the cis and trans isomers of the σ-bridging alkyne complex (η C5H5)2Ir2(CO)2(CF3C2CF3) were obtained; the cis isomer is slowly transformed to the trans isomer at 160�. These complexes do not react further with alkynes. Two other products were identified as an iridiocyclobutenone complex and a iridiocyclopentadiene complex, viz.(η-C5H5){IrC(CF3)=C(CF3)CO}(CO) and (η-C5H5){IrC(CF3)=C(CF3)C(CF3)}(CO)These complexes are also inert to further reaction with hexafluorobut-2-yne, and the iridiocyclopentadiene complex could not be converted into the cyclopentadienone complex (η-C5H5)Ir{C4(CF3)4-CO). The spectroscopic properties of a product of formula (η-C5H5)Ir(CF3C2CF3)2(C4HF5) indicate it incorporates a 1-(2',2'-difluoroethenyl)-1,2,3,4,5-pentakis(trifluoromethyl)cyclopenta-2,4-diene ligand. The final product was formulated as (η-C5H5)Ir2(CO)3(CF3C2CF3)2H and five alternativestructures are consistent with the spectroscopic data. The related reaction between (η-C5H5)Ir(CO)2 and but-2-yne at 180� gives a small amount of hexamethylbenzene plus the maleoyl complex(η-C5H5){IrC(O)(Me=C(Me)C(O)}(CO).

Selective Supramolecular Membrane Transport of cis and trans Diastereoisomers of the Diamminebis(ethane-1,2-diamine)cobalt(III) Cation by the Natural Ionophore Lasalocid A

1995 ◽  
Vol 48 (4) ◽  
pp. 879 ◽  
Author(s):  
PSK Chia ◽  
AJ Leong ◽  
LF Lindoy ◽  
GW Walker
Keyword(s):  
Membrane Transport ◽  
Trans Isomer ◽  
Trans Isomers ◽  
Cis And Trans Isomers ◽  
Carrier Mediated Transport ◽  
Significant Difference ◽  
Transport Experiment ◽  
Transport Behaviour ◽  
Source Phase ◽  
Cis And Trans

Carrier-mediated transport of the cis and trans diastereoisomers of the diamminebis (ethane-1,2-diamine)cobalt(III) cation across a chloroform membrane by the natural ionophore lasalocid A is reported. In the case where individual isomers were run, no significant difference in their transport behaviour was observed. However, a competitive transport experiment in which equimolar concentrations of the cis and trans isomers of the above cation were present in the source phase led to enhanced transport of the trans isomer relative to the cis. Under the conditions employed, the final cis-to-trans ratio in the receiving phase was 1 : 3.

Synthesis and NMR characterization of the cis and trans isomers of [Ptii(N9-adeH)2(pz)2] and X-ray crystallography of the trans isomer

2007 ◽  
pp. 3966 ◽  
Author(s):  
Karel D. Klika ◽  
Henri Kivelä ◽  
Vladimir V. Ovcharenko ◽  
Ville Nieminen ◽  
Reijo Sillanpää ◽  
...  
Keyword(s):  
Trans Isomer ◽  
Trans Isomers ◽  
X Ray ◽  
X Ray Crystallography ◽  
Cis And Trans Isomers ◽  
Nmr Characterization ◽  
Cis And Trans

scholarly journals Proton Magnetic Resonance Analysis of the trans Isomer of 2-Chloro-4-methyl-1,3,2-dioxaphospholane and the cis and trans Isomers of 2-Chloro-4,5-dimethyl-1,3,2-dioxaphospholane.

1972 ◽  
Vol 26 ◽  
pp. 2153-2156 ◽  
Author(s):  
Knut Bergesen ◽  
Trond Vikane ◽  
Thor Gramstad ◽  
Olof Wennerström ◽  
Sigfrid Svensson
Keyword(s):  
Magnetic Resonance ◽  
Trans Isomer ◽  
Proton Magnetic Resonance ◽  
Trans Isomers ◽  
Resonance Analysis ◽  
Cis And Trans Isomers ◽  
Cis And Trans

Gas Chromatographic Analysis of Insect Attractants: Trimedlure, Medlure, Siglure, Butyl Sorbate, Cue-lure, Methyleugenol

1964 ◽  
Vol 47 (5) ◽  
pp. 838-841
Author(s):  
Morton Beroza ◽  
Rafael Sarmiento
Keyword(s):  
Gas Chromatography ◽  
Trans Isomer ◽  
Chromatographic Analysis ◽  
Insect Pests ◽  
Sharp Peak ◽  
Single Peak ◽  
Trans Isomers ◽  
High Quality ◽  
Cis And Trans Isomers ◽  
Cis And Trans

Abstract Means of analyzing trimedlure, medlure, siglure, butyl sorbate, cue-lure, and methyleugenol by gas chromatography have been devised to ensure the procurement of high quality attractants needed for the detection of insect pests, especially those invading noninfested areas. The methods permit the estimation of the 4 trans isomers present in commercially produced trimedlure and medlure, and of the cis and trans isomers of siglure. Commercially available butyl sorbate gives a single sharp peak and is supposed to be the trans, trans isomer. Cue-lure and methyleugenol each give a single peak.

Selective UV Resonance Raman Excitation of Vinyl Group Vibrations in an Isomer of Crotyl Chloride

1993 ◽  
Vol 47 (4) ◽  
pp. 475-478 ◽  
Author(s):  
S. Chadha ◽  
W. H. Nelson ◽  
R. Emrich ◽  
E. Lindesmith
Keyword(s):  
Raman Spectra ◽  
Trans Isomer ◽  
Relative Intensity ◽  
Electronic Transition ◽  
The Other ◽  
Trans Isomers ◽  
Cis And Trans Isomers ◽  
Uv Resonance Raman ◽  
Vinyl Group ◽  
Cis And Trans

The Raman spectra of cis, trans, and vinyl isomers of crotyl chloride (i.e., cis and trans 1-chloro-2-butene, and 3-chloro-1-butene) have been excited at 218 nm and at 231 nm. With 218-nm excitation the ethylenic mode belonging to the vinyl isomer is only modestly preresonance enhanced. On the other hand, the preresonance enhancement of the peaks belonging to the cis and trans isomers is very noticeable and nearly identical in energy to the peaks of cis and trans polybutadiene, which occur at 1655 and 1665 cm−1, respectively. However, with 231-nm excitation the vinyl-isomer ethylenic mode at 1633 cm−1 is very strongly enhanced, while the cis and trans isomer modes show no corresponding enhancement, but appear to decrease in relative intensity. Responsibility for the strong vinyl group enhancement is assigned to an electronic transition observed as a broad shoulder near 230 nm. By exciting at 231 nm it is possible to detect small amounts of the vinyl isomer in the presence of cis and trans crotyl chloride. Remarkably strong enhancement under 231-nm excitation has been noted as well for the first overtone of the vinyl ethylenic mode observed at 3263 cm−1.

PHOTOCHEMICAL TRANSFORMATIONS OF SOME 4′-AMINO-2-STYRYLPYRIDINES AND THEIR SALTS

1965 ◽  
Vol 43 (5) ◽  
pp. 1345-1356 ◽  
Author(s):  
J. L. R. Williams ◽  
J. M. Carlson ◽  
R. E. Adel ◽  
G. A. Reynolds
Keyword(s):  
Aqueous Solutions ◽  
Trans Isomer ◽  
Ultraviolet Irradiation ◽  
Water Soluble ◽  
Trans Isomers ◽  
Photochemical Behavior ◽  
Photochemical Transformations ◽  
Cis And Trans Isomers ◽  
Cis And Trans

The photochemical behavior of 4′-amino-, 4′-dimethylamino-, 4′-diethylamino-, and 4′-di-n-propylamino-substituted trans-2-styrylpyridine were studied. Ultraviolet irradiation of aqueous solutions of the bishydrochlorides and methiodide–hydrochlorides for moderate periods of time produced mixtures of the corresponding cis and trans isomers. Long irradiation times produced the corresponding dimers in all cases except that of trans-4′-di-n-propyl-amino-2-styrylpyridine. The cis isomers of the free bases and methiodides were isolated from the cis–trans mixtures. The trans-methiodides are not photochemically labile. The spectra of each pair of isomers were determined in water and in 50% methanol–water, with the exception of the 4′-di-n-propylamino derivative, which is not sufficiently water soluble. In addition, the spectra of the corresponding methiodides, hydrochlorides, bishydrochlorides, and methiodide–hydrochlorides were determined. The basic strengths of the nitrogens in the cis–trans isomer pairs of the free bases and methiodides have been determined spectroscopically in water and in 50% methanol-water.

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