@article {4517,
	title = {Hydrocarbon C-H bond activation by a tungsten acetylene complex},
	journal = {Organometallics},
	volume = {18},
	number = {17},
	year = {1999},
	note = {ISI Document Delivery No.: 230KBTimes Cited: 13Cited Reference Count: 60},
	month = {Aug},
	pages = {3414-3428},
	type = {Article},
	abstract = {Thermal activation of Cp*W(NO)(eta(2)-CPhCH2)(CH2SiMe3) (1) in neat hydrocarbon solutions transiently generates Cp*W(NO)(eta(2)-PhC=CH) (A), which subsequently activates solvent C-H bonds. For example, the thermolysis of 1 in benzene solution generates quantitatively Cp*W(NO)(eta(2)-CPhCH2)(Ph) (2) The thermolysis of 1 in solutions of methyl-substituted arenes such as toluene or p-, m-, or o-xylene provides mixtures of aryl and benzyl vinyl complexes of the general formulas Cp*W(NO)(eta(2)-CPhCH2)(aryl), Cp*W(NO)(eta(2)-CPhCH2)(eta(1)-benzyl), or Cp*W(NO)(eta(2)-benzyl)(eta(1)-CPh=CH2). Similarly, the thermolysis of 1 in (Me3Si)(2)O affords Cp*W(NO)(eta(2)-CPhCH2)(CH2SiMe2OSiMe3) (10). Mechanistic and kinetic studies support the proposal that the formation of A from 1 by elimination of silane is the rate-controlling process in these reactions. Intra- and intermolecular selectivity studies reveal that the strongest C-H bond (yielding the stronger M-C bond) is the preferred site of reactivity, as expected. Dual C-H bond activation of aliphatic hydrocarbons occurs during the thermal activation ;of I in solutions of these substrates. Consequently, metallacycles of the form Cp*W(NO)(eta(2)-CH(eta(2)-Ph)CH2CH(R)CH2) [(11)R = Pr-n; (12)R = Bu-n; (13)R = Bu-t; and (14)R = OEt] result from the dehydrogenation of n-pentane, n-hexane, 2,2-dimethylbutane, and diethyl ether, respectively. This dual C-H activation process displays a selectivity for substrates that contain an ethyl substituent. Dual C-H bond activation of 2,3-dimethyl-2-butene in the presence of 1 under thermolysis conditions regioselectively affords Cp*W(NO)(eta(3)-endo-CH2C(Me)C(Me)CH2(eta(1)-CPhMe)) (15), Attempts to trap acetylene complex A with PNMe3 result in the formation of the metallacyclopropane complex Cp*W(NO)(CH2SiMe3)(eta(2)-CH2CPh(PMe3)) (16). All new complexes have been characterized by conventional spectroscopic methods, and the solid-state molecular structures of compounds 11, 15, and 16 have been established by X-ray diffraction methods.},
	keywords = {ELIMINATION, HYDROGEN-TRANSFER, ISOMERIZATION, LIGAND, METAL-COMPLEXES, MOLECULAR-STRUCTURE, ORGANIC-SYNTHESIS, ORGANOMETALLIC NITROSYL CHEMISTRY, OXIDATIVE ADDITION, REDUCTIVE, R{\textquoteright} =},
	isbn = {0276-7333},
	url = {<Go to ISI>://000082249400023},
	author = {Debad, D. and Legzdins,Peter and Lumb, S. A. and Rettig, S. J. and Batchelor, R. J. and Einstein, F. W. B.}
}
@article {4590,
	title = {Reductive dechlorination of nonachlorobiphenyls and selected octachlorobiphenyls by microbial enrichment cultures},
	journal = {Environmental Science \& Technology},
	volume = {33},
	number = {20},
	year = {1999},
	note = {ISI Document Delivery No.: 248CJTimes Cited: 14Cited Reference Count: 19},
	month = {Oct},
	pages = {3579-3585},
	type = {Article},
	abstract = {The anaerobic dechlorination of four octachlorobiphenyls [2,3,4,5,6,2{\textquoteright},3{\textquoteright},4{\textquoteright}-octachlorobiphenyl (23456-234-octaCB), 2345-2346-octaCB, 2345-2356-octaCB, and 23456-245-octaCB] and three nonachlorobiphenyls [23456-2345-nonaCB, 23456-2346-nonaCB, and 23456-2356-nonaCB] was investigated. The single congeners were added to two different previously studied microbial enrichment cultures, and the cultures were monitored over a period of 16 weeks. All seven congeners were reductively dechlorinated. The predominant dechlorination patterns for all congeners, in both cultures, showed meta-dechlorination of doubly flanked m-chlorines followed by meta-dechlorination of singly flanked m-chlorines. Some ortho- and para-dechlorination was also observed. All congeners had an initial concentration of 50 ppm in soil, and the extent of dechlorination over the 16-week period varied widely, from 38\% dechlorination of congener 23456-245-octaCB to only 1.4\% removal of congener 23456-2345-nonaCB.},
	keywords = {ANAEROBIC MICROORGANISMS, AROCLORS, CONGENERS, DECHLORINATION, ESTUARINE SEDIMENTS, POLYCHLORINATED-BIPHENYLS, REDUCTIVE, SLURRIES},
	isbn = {0013-936X},
	url = {<Go to ISI>://000083257500016},
	author = {Kuipers, B. and Cullen, W. R. and Mohn, W. W.}
}
