Thermolysis of diene iron tricarbonyl complexes. Cis-trans isomerization and hydrogen scrambling reactions in cyclic and acyclic complexes

1976 ◽  
Vol 98 (1) ◽  
pp. 63-73 ◽  
Author(s):  
Thomas H. Whitesides ◽  
James P. Neilan
Keyword(s):  
Trans Isomerization ◽  
Acyclic Complexes ◽  
Iron Tricarbonyl ◽  
Hydrogen Scrambling

Azaoxa Macrocyclic and Acyclic Complexesof Lanthanides

1998 ◽  
Vol 63 (3) ◽  
pp. 363-370 ◽  
Author(s):  
Violetta Patroniak-Krzyminiewska ◽  
Wanda Radecka-Paryzek
Keyword(s):  
Schiff Base ◽  
Spectral Data ◽  
Macrocyclic Ligand ◽  
Lanthanide Ions ◽  
H Nmr ◽  
Elemental Analyses ◽  
Acyclic Complexes ◽  
Schiff Base Cyclocondensation

The template reactions of 2,6-diacetylpyridine with 3,6-dioxaoctane-1,8-diamine in the presence of dysprosium(III), thulium(III) and lutetium(III) chlorides and erbium(III) perchlorate produce the complexes of 15-membered macrocyclic ligand with an N3O2 set of donor atoms as a result of the [1+1] Schiff base cyclocondensation. In contrast, analogous reactions involving the lighter lanthanide ions (lanthanum(III), samarium(III) and europium(III)) yield the acyclic complexes with terminal acetylpyridyl groupings as products of the partial [2+1] condensation. The complexes were characterized by spectral data (IR, UV-VIS, 1H NMR, MS), and thermogravimetric and elemental analyses.

Cis–trans isomerization and optical laser writing in new heterocycle based azo-polyurethanes

2012 ◽  
Vol 34 (4) ◽  
pp. 724-728 ◽  
Author(s):  
Antonio Ambrosio ◽  
Fabio Borbone ◽  
Antonio Carella ◽  
Roberto Centore ◽  
Sandra Fusco ◽  
...  
Keyword(s):  
Laser Writing ◽  
Trans Isomerization ◽  
Optical Laser

Solvent and viscosity effect on the kinetics of the thermal cis-trans isomerization of 3'-nitro-4-diethylaminoazobenzene

1989 ◽  
Vol 11 (3) ◽  
pp. 179-189 ◽  
Author(s):  
Bruno Marcandalli ◽  
Pier Luigi Beltrame ◽  
Ernestina Dubini-Paglia ◽  
Alberto Seves
Keyword(s):  
Viscosity Effect ◽  
Trans Isomerization ◽  
Kinetics Of

ChemInform Abstract: PHOTOCHEMICAL CIS TRANS ISOMERIZATION OF A STILBAZOLIUM BETAINE. A PROTOLYTIC PHOTOCHEMICAL REACTION CYCLE

1978 ◽  
Vol 9 (34) ◽  
Author(s):  
U. STEINER ◽  
M. H. ABDEL-KADER ◽  
P. FISCHER ◽  
H. E. A. KRAMER
Keyword(s):  
Photochemical Reaction ◽  
Reaction Cycle ◽  
Trans Isomerization

The Crystallization of Modified Cis-Polybutadiene

1960 ◽  
Vol 33 (3) ◽  
pp. 699-702
Author(s):  
G. S. Trick
Keyword(s):  
Melting Point ◽  
Crosslink Density ◽  
Fixed Temperature ◽  
Trans Isomerization

Abstract From a sample of polybutadiene of high cis-1,4 content, the microstructure is modified by cis-trans isomerization or by crosslinking. Measurements of rates of crystallization and melting point are made on the modified samples. An increase in irons content or crosslink density markedly decreases the rate of crystallization at a fixed temperature. It is found, however, that this retardation in rate may usually be accounted for by the depressed melting point of the modified samples.

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