39494-19-4Relevant academic research and scientific papers
Synthesis, characterization, and reactivity of palladium(II) salen and oxazoline complexes
Miller, Kimberly J.,Baag, Jun Ho,Abu-Omar, Mahdi M.
, p. 4510 - 4514 (1999)
Two methods for the syntheses of palladium(II) salen complexes are described. The first involves template synthesis of the ligand in which bis(salicylaldehydato)palladium(II), 2, is initially synthesized and reacted with the appropriate diamine bridge to yield the desired palladium salen. The template synthesis approach suffers, however, from low overall yields (17-30%). Alternatively, treatment of bis(acetonitrile)palladium(II) chloride with the appropriate salen ligand under inert atmosphere yields the palladium salen complex in high yields (80-85%). [2-(2′-Hydroxyphenyl)-2-oxazolinato]palladium(II), 7, was also synthesized. All the palladium complexes were fully characterized spectroscopically. A single-crystal X-ray structure of 7 has been solved. In contrast to previous reports, complex 2 was found to be stable over weeks and remained suitable for the template syntheses. The catalytic activity of complex 2 in cyclopropanation of alkenes with ethyl diazoacetate (EDA) was investigated. The catalyst is not functional group tolerant and works best for styrene; turnover numbers (TON's) of 45 were achieved. The availability of an open coordination site seems to be a prerequisite for catalytic decomposition of EDA.
A CATALYST COMPOSITION FOR A PRODUCTION PROCESS OF δ- LACTONE FROM CARBON DIOXIDE AND 1,3-BUTADIENE
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Page/Page column 7, (2018/07/29)
This present invention relates to a catalyst composition for a production process of δ-lactone from carbon dioxide and 1,3 -butadiene that can efficiently catalyze the synthesis reaction of δ-lactone with good selectivity of δ-lactone, wherein said catalyst composition comprising: a) palladium metal complexes as shown in structure (I) [Formula should be inserted here] wherein, R1, R2, R3 and R4 independently represents a group selected from a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an amine group, or optionally an alkenyl group, an alkynyl group, a phenyl group, a benzyl group, or a cyclic hydrocarbon group comprising a hetero atom; and b) phosphorus compound selected from a phosphine group having a general formula [Formula should be inserted here], wherein R5 is selected from an alkyl group, a cycloalkyl group, or an aryl group.
