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 method for producing ethers comprises the following steps:
initiating telomerization process of a conjugated diene compound with an hydroxyl compound represented by the following formula (I):
R1OH (I)
in the presence of a palladium compound, a tertiary isocyanide represented by the following formula (II):
R2NC (II)
, and a base; and
adding halfway through the telomerization process a tertiary phosphine represented by the following formula (III):
PR3R4R5 (III)
(the respective symbols are defined in the description).
一种生产醚的方法包括以下步骤:
启动共轭二烯化合物与下式 (I) 所代表的羟基化合物的端聚过程:
R1OH (I)
在钯化合物存在下,加入下式 (II) 所代表的叔异氰酸酯:
R2NC (II)
和一种碱;以及
在端粒化过程的中途加入下式(III)代表的叔膦:
PR3R4R5 (III)
(各符号在说明中定义)。
Beger,J. et al., Journal fur praktische Chemie (Leipzig 1954), 1973, vol. 315, p. 1077 - 1089
作者:Beger,J. et al.
DOI:——
日期:——
Berger, R.; Gaube, W., Journal fur praktische Chemie (Leipzig 1954), 1985, vol. 327, # 4, p. 643 - 648
作者:Berger, R.、Gaube, W.
DOI:——
日期:——
Method For Producing Ethers
申请人:Tokuyasu Jin
公开号:US20080262272A1
公开(公告)日:2008-10-23
A method for producing ethers comprises the following steps:
initiating telomerization process of a conjugated diene compound with an hydroxyl compound represented by the following formula (I):
R
1
OH (I)
in the presence of a palladium compound, a tertiary isocyanide represented by the following formula (II):
R
2
NC (II)
, and a base; and
adding halfway through the telomerization process a tertiary phosphine represented by the following formula (III):
PR
3
R
4
R
5
(III)
(the respective symbols are defined in the description).