The lithium aluminium hydride reduction of cyclohexadienylmanganese complexes
作者:Peter Bladon、George A.M. Munro、Peter L. Pauson、Christopher A.L. Mahaffy
DOI:10.1016/s0022-328x(00)81031-1
日期:1981.11
Reduction of cyclohexadienyltricarbonylmanganese or its ring-substituted derivatives with lithiumaluminium hydride leads to dihydro-derivatives. Preparative and NMR spectral information is presented and interpreted on the basis of the CH-bridged cyclohexenyl structure recently established for these products by Lamanna and Brookhart [3].
Brookhart; Lamanna; Pinhas, Allan R., Organometallics, 1983, vol. 2, # 5, p. 638 - 649
作者:Brookhart、Lamanna、Pinhas, Allan R.
DOI:——
日期:——
Photochemical Rearomatization and Dearomatization of Tricarbonyl(η<sup>5</sup>-cyclohexadienyl)manganese Complexes
作者:Li Zhou、Li-Zhu Wu、Li-Ping Zhang、Chen-Ho Tung
DOI:10.1021/om050953b
日期:2006.3.1
Photoirradiation of the tricarbonyl(eta(5)-cyclohexadienyl)manganese complexes 2 in dichloromethane or cyclohexane leads to the formation of the rearomatization products 3 in high yield, while photoirradiation of 2 in acetonitrile or dimethylformamide results in 3 and deaxomatization products 5 and 6 with the ratio 1(5 + 6) of ca. 1:1. In the presence of acetic acid the photochemical reaction of 2 both in dichloromethane and in acetonitrile exclusively yields 5 and 6. The photochemical reaction of 2 might be of significant utility in the synthesis of functionalized arenes and substituted cyclohexadienes.
Synthesis and reactions of acyl(cyclohexadienyl)manganates
作者:John B. Sheridan、Ranbir S. Padda、Karen Chaffee、Chenjie Wang、Yazhong Huang、Roger Lalancette
DOI:10.1039/dt9920001539
日期:——
The cyclohexadienyl complexes [Mn(eta-5-C6H6R1)(CO)3] 1 (R1 = exo-H, Me or C6H4Me-4) react with LiR2 (R2 = Me or Ph) to give acylmetalates [Li(OEt2)][Mn(eta-5-C6H6R1)(CO)2C(O)R2}] 2. Complex 2 (R1 = Me, R2 = Ph) has been characterised by an X-ray crystallographic study: orthorhombic, space group P2(1)2(1)2(1), a = 9.113(2), b = 14.491(8), c = 32.803(9) angstrom, R = 0.064 for 1458 independent reflections. Protonation of 2 with HBF4.Et2O induces an aryl- or alkyl-group transfer to the endo face of the cyclohexadienyl ring yielding the new agostic cyclohexenyl complexes [Mn(eta(3:CH)C6H7R1R2)(CO)3] 3. The cyclohexenyl ligands can be decomplexed from the metal via treatment of 3 with 1,2-bis-(diphenylphosphino)ethane (dppe) in tetrahydrofuran to afford mixtures of substituted cyclohexa-1,3-dienes and [MnH(CO)3(dppe)]. The acylmetalates 2 react with [NO][BF4] at -78-degrees-C to give [Mn(eta-5-C6H6R1)(CO)(NO)C(O)R2}] which decompose at room temperature to form the trans-disubstituted acylcyclohexadienes C6H6R1[C(O)R2]. Reaction of 2 with electrophiles SiMe3Cl, [Me3O][BF4] or [Et3O][BF4] results in O alkylation and formation of stable carbene complexes [Mn(eta-5-C6H6R1)(CO)2-C(OE)R2}] (E = SiMe3, Me or Et).
Synthesis and electrophilic reactivity of dicarbonyl(cyclohexadienyl)nitrosylmanganese cations
作者:Y. K. Chung、Hyung Soo Choi、D. A. Sweigart、Neil G. Connelly