REGIOSELECTIVE HYDROFORMYLATION OF CYCLIC VINYL AND ALLYL ETHERS WITH RHODIUM CATALYSTS - CRUCIAL INFLUENCE OF THE SIZE OF THE PHOSPHORUS COCATALYST

被引:107
作者
POLO, A
CLAVER, C
CASTILLON, S
RUIZ, A
BAYON, JC
REAL, J
MEALLI, C
MASI, D
机构
[1] UNIV BARCELONA,FAC CIENCIES QUIM TARRAGONA,DEPT QUIM,PCA IMPERIAL TARRACO 1,E-43005 TARRAGONA,SPAIN
[2] UNIV AUTONOMA BARCELONA,DEPT QUIM,E-08193 BARCELONA,SPAIN
[3] IST STUDIO STEREOCHIM & ENERGET COMPOSTI COORDINAZ,I-50132 FLORENCE,ITALY
关键词
D O I
10.1021/om00059a015
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
In the course of studies aimed at developing new catalytic systems, we have explored the possibilities offered by the modification of thiolato bridges in dinuclear rhodium complexes, together with the influence of the cocatalyst, on the selective hydroformylation of cyclic vinyl and allyl ethers. The dinuclear complex [Rh2(mu-S(CH2)3NMe2)2(cod)2] (Cod = 1,5-cyclooctadiene) has been prepared, and its reactivity with CO, phosphines, and phosphites has been investigated. The complex crystallizes m the monoclinic space group C2/c with Z = 8, a = 22.543 (4) angstrom, b = 12.040 (2) angstrom, c = 21.547 (3) angstrom, and beta = 98.77 (1)-degrees. For the determination of the structure 4091 unique reflections were used, and the final refinement gave R = 4.1% and R(w) = 4A%. The molecular structure reveals that the two rhodium atoms are bridged by the two thiolato ligands, and the cyclooctadiene completes the coordination of the metal atoms. The amine groups are not bonded to the rhodium. The dinuclear complex has been used in the hydroformylation of 2,3-dihydrofuran, 2,5-dihydrofuran, 3,4-dihydro-2H-pyran, and 3,6-dihydro-2H-pyran. Hydroformylation reactions of dihydrofurans required conditions milder than those for dihydropyrans. The major product in the hydroformylation of 3,4-dihydro-2H-pyran or 3,6-dihydro-2H-pyran was tetrahydropyran-2-carbaldehyde. A systematic study of the influence of the reaction parameters on the selectivity of the hydroformylation of 2,3-dihydrofuran and 2,5-dihydrofuran was undertaken. The study allowed the rationalization of the observed selectivity and the optimization of the yields and regioselectivities. Thus, by modification of the reaction parameters, tetrahydrofuran-3-carbaldehyde was obtained in quantitative yields from 2,5-dihydrofuran and tetrahydrofuran-2-carbaldehyde can be prepared from either 2,3-dihydrofuran or 2,5-dihydrofuran in approximately 75% yield.
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页码:3525 / 3533
页数:9
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