An unprecedented rhodium-catalyzed selective cleavage of double alkyl-oxygen bonds of bis/tris(o-alkyloxyphenyl)phosphine has been realized, in which P atom functions as a. directing group and simple aryl acids are the methyl group acceptor to provide methyl esters and a quaternary phosphonium salt. The preliminary mechanism was investigated via an O-18 labeling experiment and stoichiometric reaction between a Rh-A crystal and an aromatic acid.
A process for producing an alkadienol which comprises reacting a conjugated alkadiene with water in a reaction solvent in the presence of a palladium catalyst, separating the solvent from the resultant reaction mixture by distilling the mixture under the condition wherein the temperature of the bottom oil in a distillation column is 120 °C or below while directly feeding hot water and/or steam as the heat-transfer medium to the column, and subjecting the bottom to phase separation. This process causes neither the decomposition and/or polymerization of the formed alkadienol nor the metallation of the palladium catalyst, and hence serves to inhibit the loss of the alkadienol and the catalyst and provide the objective alkadienol in a high yield.
AN IMPROVED PROCESS FOR TELOMERIZATION OF BUTADIENE
申请人:Dow Global Technologies LLC
公开号:EP2321244A2
公开(公告)日:2011-05-18
IMPROVED PROCESS FOR TELOMERIZATION OF BUTADIENE
申请人:Dow Global Technologies LLC
公开号:EP2321244B1
公开(公告)日:2016-12-21
PROCESS FOR TELOMERIZATION OF BUTADIENE
申请人:Briggs John R.
公开号:US20110137086A1
公开(公告)日:2011-06-09
In an improved process for telomerizing butadiene, contact butadiene and an organic hydroxy compound represented by formula ROH (I), wherein R is a substituted or unsubstituted C
1
-C
20
-hydrocarbyl and the organic hydroxy compound is not glycerol, in a reaction fluid in the presence of a palladium catalyst and a phosphine ligand represented by formula PAr
3
(II), wherein each Ar is independently a substituted or unsubstituted aryl having a hydrogen atom on at least one ortho position, at least two Ar groups are ortho-hydrocarbyloxyl substituted aryls. The phosphine ligand has a total of two (2), three (3), four (4), five (5), or six (6) substituted or unsubstituted C
1
-C
20
-hydrocarbyloxyls, and optionally, any two adjacent substituents on an Ar group can be bonded to form a 5- to 7-membered ring.