M. Camargo et al., CATIONIC CYCLOPALLADATED COMPLEXES - NEW CATALYST PRECURSORS FOR THE TELOMERIZATION OF BUTADIENE WITH ALCOHOLS, Journal of molecular catalysis. A, Chemical, 109(2), 1996, pp. 127-131
The cationic cyclopalladated complexes derived from N,N-dimethylbenzyl
amine 4, N-benzylidene-(S)-(-)-alpha-methyl-benzylamine 5 and 8-methyl
quinoline 6 have been prepared and their properties as catalyst precu
rsors for the telomerization of butadiene with methanol were investiga
ted. The butadiene conversion was 60-70% for the three complexes and a
mixture of butadiene dimers and telomers containing 2, 4 and 6 butadi
ene units were formed. The product selectivity is strongly influenced
by the nature of the cyclopalladated complex. Thus, with complex 6 the
C16 and C24 telomers were formed preferentially (more than 85%). On t
he other hand, with complex 4 the amount of butadiene dimers is greate
r than 40%. Complex 6 is also active for the telomerization of other a
liphatic alcohols, but in these cases the 1- and 3-alkoxy octadiene te
lomers were produced preferentially.