Manganese Thiophene Tricarbonyl Complexes: Nucleophilic Addition to Sulfur and Synthesis of Thiophenium Salts
作者:Su Seong Lee、Tae-Young Lee、Dae Seung Choi、Jun Sik Lee、Young Keun Chung、Soon W. Lee、Myoung Soo Lah
DOI:10.1021/om970031b
日期:1997.4.1
with respect to Grignard reagent addition, the known compounds [(thiophene)Mn(CO)3]+ (thiophene = thiophene, 2-methylthiophene, 2,5-dimethylthiophene) have been synthesized and their reaction with Grignard reagents studied. In all cases, S-R-thiophene manganese carbonyls 3 were obtained as a sole product. Refluxing 3 (R = Ph, p-tolyl, 2-thienyl) with Me3NO in benzene yielded diaryl sulfide. Treatment
Huckett, Sara C.; Sauer, Nancy N.; Angelici, Robert J., Organometallics, 1987, vol. 6, # 3, p. 591 - 596
作者:Huckett, Sara C.、Sauer, Nancy N.、Angelici, Robert J.
DOI:——
日期:——
Models for the Homogeneous Hydrodesulfurization of Thiophenes: Manganese-Mediated Carbon−Sulfur Bond Cleavage and Hydrogenation Reactions
作者:Conor A. Dullaghan、Gene B. Carpenter、Dwight A. Sweigart、Dai Seung Choi、Su Seong Lee、Young K. Chung
DOI:10.1021/om970822d
日期:1997.12.1
Chemical reduction of a series of (eta(5)-thiophene)Mn(CO)(3)(+) complexes (3a-d) under an atmosphere of CO affords dimanganese metallathiacyclic complexes (4a-d), which have a Mn(CO)(4) moiety regioselectively inserted into a C-S bond. Reaction of 4 with H-2, the rate of which is strongly influenced by substituents on the thiophene ring, leads to hydrogenolysis of the Mn-C sigma-bond and formation of (OC)(3)Mn(mu-H)(mu-SCRCHCHCHR')Mn(CO)(3) (8; R, R' = H, Me), which contains bridging hydride and thiolate ligands and a Mn-Mn bond. The addition of PhMgBr to 3 occurs at the sulfur to give zwitterionic complexes (6a-c, 14), which undergo regioselective hydrogenolysis of a C-S bond and, in some cases, partial desulfurization with concomitant formation of (OC)(4)Mn(mu-H)(mu-SPh)Mn(CO)(4) (5a). Crystal structures are reported for complexes 4b,d, 5a, 8d, 10, 12c, and 14b,c. It is suggested that the reactions reported herein may be relevant to the general problem of hydrodesulfurization (HDS) of thiophenic molecules.
Model Compounds for the Homogeneous Hydrodesulfurization of Benzothiophene: Insertion of Manganese into the SC(aryl) Bond
作者:Conor A. Dullaghan、Shouheng Sun、Gene B. Carpenter、Brandon Weldon、Dwight A. Sweigart