Premium
The Mechanism of the Action of Organometallic Catalysts
Author(s) -
Sinn H.,
Patat F.
Publication year - 1964
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.196400931
Subject(s) - isoprene , adduct , chemistry , chemisorption , monomer , catalysis , heptane , homogeneous , polymer chemistry , photochemistry , organic chemistry , copolymer , polymer , thermodynamics , physics
Kinetic investigations of the polyreaction of isoprene with organolithium compounds as initiators in n‐heptane as solvent indicate the following sequence of reactions: 1. formation of an adduct between a monomeric form of the organolithium compound and the isoprene and 2. reaction of this adduct with an associated form of the organolithium compound with insertion of the isoprene. The adduct formation is considered to be due to chemisorption, and proof of such chemisorption of a monomer (ethylene) is also demonstrated for a homogeneous Ziegler‐type catalyst. All the reactions can be formulated in the form of cyclic structures with electron‐deficient character. Postulation of such ring structures explains the surprising values obtained for the frequency factors and equilibrium constants.