@article {2694, title = {Construction of Carbo- and Heterocycles Using Radical Relay Cyclizations Initiated by Alkoxy Radicals}, journal = {Organic Letters}, volume = {11}, number = {9}, year = {2009}, note = {ISI Document Delivery No.: 438ATTimes Cited: 5Cited Reference Count: 55Zhu, Hai Wickenden, Jason G. Campbell, Natalie E. Leung, Joe C. T. Johnson, Kayll M. Sammis, Glenn M.}, month = {May}, pages = {2019-2022}, type = {Article}, abstract = {An efficient method for the rapid construction of carbo- and heterocycles has been developed using radical relay cyclizations initiated by alkoxy radicals. Linear substrates were cyclized to form a wide range of cyclopentane, pyrrolidine, tetrahydropyran, and tetrahydrofuran derivatives in excellent yields. This methodology was utilized as a key step in the synthesis of the tetrahydrofuran fragment in (-)-amphidinolide K.}, keywords = {1, 5-HYDROGEN ATOM TRANSFER, AMPHIDINOLIDE K, C-H ACTIVATION, CARBONYLATION, CHAIN REACTIONS, EFFICIENT, FUNCTIONALIZATION, ORGANIC-SYNTHESIS, REARRANGEMENT, TRANSLOCATION REACTIONS}, isbn = {1523-7060}, url = {://000265529000039}, author = {Zhu, H. and Wickenden, J. G. and Campbell, N. E. and Leung, J. C. T. and Johnson, K. M. and Sammis, G. M.} } @article {2694, title = {Construction of Carbo- and Heterocycles Using Radical Relay Cyclizations Initiated by Alkoxy Radicals}, journal = {Organic Letters}, volume = {11}, number = {9}, year = {2009}, note = {ISI Document Delivery No.: 438ATTimes Cited: 5Cited Reference Count: 55Zhu, Hai Wickenden, Jason G. Campbell, Natalie E. Leung, Joe C. T. Johnson, Kayll M. Sammis, Glenn M.}, month = {May}, pages = {2019-2022}, type = {Article}, abstract = {An efficient method for the rapid construction of carbo- and heterocycles has been developed using radical relay cyclizations initiated by alkoxy radicals. Linear substrates were cyclized to form a wide range of cyclopentane, pyrrolidine, tetrahydropyran, and tetrahydrofuran derivatives in excellent yields. This methodology was utilized as a key step in the synthesis of the tetrahydrofuran fragment in (-)-amphidinolide K.}, keywords = {1, 5-HYDROGEN ATOM TRANSFER, AMPHIDINOLIDE K, C-H ACTIVATION, CARBONYLATION, CHAIN REACTIONS, EFFICIENT, FUNCTIONALIZATION, ORGANIC-SYNTHESIS, REARRANGEMENT, TRANSLOCATION REACTIONS}, isbn = {1523-7060}, url = {://000265529000039}, author = {Zhu, H. and Wickenden, J. G. and Campbell, N. E. and Leung, J. C. T. and Johnson, K. M. and Sammis, G. M.} } @article {2778, title = {REACTIVITY OF THE LEWIS-ACIDS CP-ASTERISK-M(NO)(CH2CME3)CL [M = MO, W] AND RELATED COMPLEXES}, journal = {Organometallics}, volume = {12}, number = {7}, year = {1993}, note = {ISI Document Delivery No.: LU682Times Cited: 26Cited Reference Count: 43}, month = {Jul}, pages = {2714-2725}, type = {Article}, abstract = {{Treatments of Cp*M(NO)Cl2 [Cp* = eta5-C5Me5; M = Mo, W] with 0.5 equiv of (Me3CCH2)2Mg.X(dioxane) in THF at low temperatures affords the monoalkylated complexes, Cp*M(NO)(CH2CMe3)Cl (1, 1{\textquoteright}). Exposure to a second 0.5 equiv of (Me3CCH2)2Mg.X(dioxane) at higher temperatures produces the dialkyl complexes, Cp*M(NO)(CH2CMe3)2 (2,2{\textquoteright}). Utilizing the two series of Cp*M(NO)Cl2, Cp*M(NO)(CH2CMe3)Cl and Cp*M(NO)(CH2CMe3)2 complexes, the relative electron deficiencies in these 16-electron complexes can be assessed spectroscopically and electrochemically. Without exception, the Mo complexes are the stronger Lewis acids. Also, the mononeopentyl derivatives for both metals are more reactive toward a variety of substrates than are their bis(neopentyl) analogues. Complexes 1 and 1{\textquoteright} serve as precursors to mixed alkyl and alkyl aryl complexes (3, 3{\textquoteright}, 4, 4{\textquoteright}) and yield metal-centered adducts with PMe3 and pyridine (5, 5{\textquoteright}, 6, 6{\textquoteright}). CO and CNCMe3 readily insert into the M-C bonds of 1 and 1{\textquoteright}. The insertion products, Cp*M(NO)(C{E}CH2CMe3)Cl (7, 7{\textquoteright}}, keywords = {ALKYL, C-H, CARBONYLATION, CONVERSION, DERIVATIVES, H ACTIVATION REACTIONS, MIGRATORY INSERTION, MOLYBDENUM, ORGANOMETALLIC NITROSYL CHEMISTRY, TUNGSTEN}, isbn = {0276-7333}, url = {://A1993LU68200046}, author = {Debad, J. D. and Legzdins,Peter and Rettig, S. J. and Veltheer, J. E.} } @article {2777, title = {SYNTHESIS AND CHARACTERIZATION OF THE ASYMMETRIC COMPLEXES CP-ASTERISK-W(NO)(R)(R{\textquoteright}) [R, R{\textquoteright} = ALKYL, ARYL] AND REGIOSELECTIVE INSERTIONS OF CO INTO THEIR W-C SIGMA-BONDS}, journal = {Organometallics}, volume = {12}, number = {6}, year = {1993}, note = {ISI Document Delivery No.: LG158Times Cited: 35Cited Reference Count: 37}, month = {Jun}, pages = {2094-2102}, type = {Article}, abstract = {{Treatment of Cp*W(NO)(Cl)2 (CP* = eta5-C5Me5) with 0.5 equiv of a R2Mg.X(dioxane) reagent (R = CH2CMe3, CH2SiMe3, Ph, o-tolyl) results in the formation of the alkyl and aryl chloro complexes Cp*W(NO)(R)(CI), which have been isolated and fully characterized. Metathesis of these complexes with 0.5 equiv of another R{\textquoteright}2Mg.x (dioxane) reagent (R{\textquoteright} = CH2CMe3, CH2SiMe3, Me, Ph, o-tolyl) affords a series of 16-electron, mixed alkyl and aryl complexes,; Cp*W-(NO)(R)(R{\textquoteright}), having all ten combinations of R not-equal R{\textquoteright}. These complexes have been characterized by conventional spectroscopic methods. The competitive reactivity of the different tungsten-carbon sigma bonds in these species toward CO insertion has been investigated. Each complex reacts with 1 equiv of CO under ambient conditions to produce the corresponding eta2-acyl complex presumably via an initial carbonyl adduct. An X-ray diffraction analysis of Cp*W(NO)(Ph)-eta2-C{O}CH2CMe3) has been performed to confirm the existence of the eta2-acyl linkage in one of these complexes: space group P2(1)/n}, keywords = {CARBON-MONOXIDE INSERTION, CARBONYLATION, CHEMISTRY}, isbn = {0276-7333}, url = {://A1993LG15800020}, author = {Debad, J. D. and Legzdins,Peter and Batchelor, R. J. and Einstein, F. W. B.} } @article {6990, title = {ORGANOMETALLIC NITROSYL CHEMISTRY .48. REACTIVITIES OF REPRESENTATIVE CYCLOPENTADIENYL ETA-4-TRANS-DIENE NITROSYL COMPLEXES OF MOLYBDENUM TOWARD ACETONE}, journal = {Organometallics}, volume = {10}, number = {12}, year = {1991}, note = {ISI Document Delivery No.: GV093Times Cited: 20Cited Reference Count: 31}, month = {Dec}, pages = {4021-4030}, type = {Article}, abstract = {{When CpMo(NO)(eta-4-trans-butadiene) (Cp = eta-5-C5H5) is treated with acetone, a ligand-coupling reaction occurs to form two complexes having the composition CpMo(NO)(eta-4-CH2CHCHCH2CMe2O), one in which the allyl portion of the coupled ligand is endo (1A) and one in which the allyl is exo (1B) with respect to the Cp ligand. Complete structural assignment of 1A and 1B has been effected by using NMR spectroscopic methods. Similar treatment of Cp*Mo(NO)(eta-4-trans-butadiene) (Cp* = eta-5-C5Me5) affords a single organometallic product, 2, which is the Cp* analogue of 1A. The coupling reaction between CpMo(NO)(eta-4-trans-2,5-dimethyl-2,4-hexadiene) and acetone is fairly rapid, the initial products being the endo-allyl (3A) and exo-allyl (3B) complexes. The endo isomer, however, converts quickly and irreversibly to the exo-allyl isomer. If the latter reaction is left for 15 h at ambient conditions, then 3B and [CpMo(NO)]3(mu-2-eta-2-eta-1-O-CMe2)3, which is isolable as a THF solvate (4), are the only organometallic species present in the final reaction mixture. All new complexes isolated during this work have been fully characterized by conventional methods, and crystal structure analyses have been performed on 2, 3B, and 4. Crystals of Cp*Mo(NO)(eta-4-endo-CH2CHCHCH2CMe2O) (2) are orthorhombic, P2(1)2(1)2(1), with a = 9.2465 (15) angstrom}, keywords = {CARBONYLATION, DIENE COMPLEXES, INSERTION, LIGANDS, METAL}, isbn = {0276-7333}, url = {://A1991GV09300017}, author = {Christensen, N. J. and Legzdins,Peter and Trotter, J. and Yee, V. C.} } @article {6990, title = {ORGANOMETALLIC NITROSYL CHEMISTRY .48. REACTIVITIES OF REPRESENTATIVE CYCLOPENTADIENYL ETA-4-TRANS-DIENE NITROSYL COMPLEXES OF MOLYBDENUM TOWARD ACETONE}, journal = {Organometallics}, volume = {10}, number = {12}, year = {1991}, note = {ISI Document Delivery No.: GV093Times Cited: 20Cited Reference Count: 31}, month = {Dec}, pages = {4021-4030}, type = {Article}, abstract = {{When CpMo(NO)(eta-4-trans-butadiene) (Cp = eta-5-C5H5) is treated with acetone, a ligand-coupling reaction occurs to form two complexes having the composition CpMo(NO)(eta-4-CH2CHCHCH2CMe2O), one in which the allyl portion of the coupled ligand is endo (1A) and one in which the allyl is exo (1B) with respect to the Cp ligand. Complete structural assignment of 1A and 1B has been effected by using NMR spectroscopic methods. Similar treatment of Cp*Mo(NO)(eta-4-trans-butadiene) (Cp* = eta-5-C5Me5) affords a single organometallic product, 2, which is the Cp* analogue of 1A. The coupling reaction between CpMo(NO)(eta-4-trans-2,5-dimethyl-2,4-hexadiene) and acetone is fairly rapid, the initial products being the endo-allyl (3A) and exo-allyl (3B) complexes. The endo isomer, however, converts quickly and irreversibly to the exo-allyl isomer. If the latter reaction is left for 15 h at ambient conditions, then 3B and [CpMo(NO)]3(mu-2-eta-2-eta-1-O-CMe2)3, which is isolable as a THF solvate (4), are the only organometallic species present in the final reaction mixture. All new complexes isolated during this work have been fully characterized by conventional methods, and crystal structure analyses have been performed on 2, 3B, and 4. Crystals of Cp*Mo(NO)(eta-4-endo-CH2CHCHCH2CMe2O) (2) are orthorhombic, P2(1)2(1)2(1), with a = 9.2465 (15) angstrom}, keywords = {CARBONYLATION, DIENE COMPLEXES, INSERTION, LIGANDS, METAL}, isbn = {0276-7333}, url = {://A1991GV09300017}, author = {Christensen, N. J. and Legzdins,Peter and Trotter, J. and Yee, V. C.} }