ISSN:
0021-8383
Keywords:
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The Catalytic Activity of Glass-fixated Transition-metal ComplexesThe formation of p-ethyloxycarbonylphenyl isocyanate from p-ethyloxycarbonyl-phenyl azide and carbon monoxide in the presence of supported rhodium complexes, synthesized by reaction of RhCl(CO)(Ph2PCH2CH2Si[OEt]3)2 with porous silica glasses, is followed kinetically. The glass-fixated complexes are catalytically 500-1000 times less active than the homogeneously dissolved one. Their activity decreases with increasing metal loading of the glasses. The activation energy of the heterogeneous reaction is larger than that of the homogeneous reaction, and the reaction rate is independent of the pellet diameter, the pore volume, the pore diameter, and the specific surface of the glass supports, which speaks against a retardation fo the reaction by pore diffusion.
Additional Material:
5 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/prac.19783200609
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