Facile synthesis of (�)-2,6-dimethyloctan-1-ol formate, the biologically active analog of the smaller flour beetle aggregation pheromone, from 1-allyloxy- and 1-benzyloxy-2,6-dimethyl-2,7-octadienes, the telomers of isoprene with allyl and benzyl alcohols
作者:L. I. Zakharkin、V. V. Guseva、P. V. Petrovskii
DOI:10.1007/bf00714434
日期:1995.8
of isoprene with allyl, benzyl, 2-chloroethyl and methyl alcohols on π-allylpalladium complex catalysts was carried out. The structures of the obtained telomers were determined by1H NMR spectroscopy. 1-Alkoxy-2,6-dimethyl-2,7-octadiene is a predominant telomer. 2,6-Dimethyloctan-1-ol, which reacts with HCOOH to give (±)-2,6-dimethyloctan-1-ol formate in high yield, was obtained from 1-allyloxy- and
Dimerization of Isoprene by Palladium-Diphosphine Complex Catalyst
作者:Kuniyuki Takahashi、Go Hata、Akihisa Miyake
DOI:10.1246/bcsj.46.600
日期:1973.2
tail-to-tail dimerization almost selectively, while the addition of a large amount of phenol (phenol/isoprene=1/1.5) afforded head-to-head dimers (2-vinyl-5-methyl-1,6-heptadiene and 3,6-dimethyl-1,cis-3,7-octatriene) as main dimers (more than 40% of all the dimers). In a 1:3 ratio of phenol to isoprene the dimers consisted of mainly 2,6-dimethyl-1,trans-3,7-octatriene derived from a head-to-tail dimerization
Telomerization and dimerization of isoprene by in situ generated palladium–carbene catalysts
作者:Ralf Jackstell、Anne Grotevendt、Dirk Michalik、Larbi El Firdoussi、Matthias Beller
DOI:10.1016/j.jorganchem.2007.06.039
日期:2007.10
The palladium-catalyzed telomerization of isoprene with methanol and dimerization of isoprene have been studied in presence of in situ generated palladium–carbene catalysts. Unprecedented catalyst productivity has been observed for these two reactions. A selectivity switch from the telomer to the dimer product occurred by using different substituted carbene ligands. Among the imidazolium salts tested
A process for preparing diacyloxyalkadienes of the formula ##STR1## where R.sup.1 to R.sup.6 are each hydrogen or a hydrocarbon radical, which contain one or more hydrocarbon radicals having one or more non-conjugated double bonds, by reacting an aliphatic triene of the formula ##STR2## in which R.sup.1 to R.sup.6 have the same meanings given above with a carboxylic acid of the formula R.sup.7 -COOH in which R.sup.7 has the same meaning given above, in the presence of a catalyst which contains palladium, platinum or salts of these metals and in the presence of oxygen.