Reaction of carbon dioxide with butadiene catalyzed by palladium–phosphine complexes was studied. When the reaction was carried out in certain polar, aprotic solvents, such as dimethylformamide (DMF), 2-ethylidene-5-hepten-4-olide was formed in about 5% yield by the incorporation of CO2 together with the formation of butadiene linear dimers. The main dimer was 1,3,7-octatriene. The ditertiary phosphines
The new chiral aminodiphosphinite ligands are readily prepared from chiral amino acids. These compounds were characterized by 13C and 31P NMR spectroscopy and their behaviour as homogeneous catalysts was investigated in the linear dimerization of butadiene.
新的手性氨基二亚膦酸酯配体易于从手性氨基酸制备。这些化合物通过13 C和31 P NMR光谱进行表征,并在丁二烯的线性二聚反应中研究了它们作为均相催化剂的行为。
Preparation of o-xylene and ethylbenzene
申请人:BASF Aktiengesellschaft
公开号:US04436944A1
公开(公告)日:1984-03-13
O-xylene and ethylbenzene are prepared by converting, 2,7-octadien-1-ol, 1,7-octadien-3-ol or mixtures containing these octadienols, or carboxylates of 2,7-octadien-1-ol or of 1,7-octadien-3-ol, or mixtures containing these carboxylates at from 200.degree. to 550.degree. C. over a catalyst.