- SPECTROSCOPIC INVESTIGATION OF MOLECULAR ASSOCIATION AND PHOTOCHEMICAL REACTION PROCESSES IN ARYL ETHYLENES AND SOME OTHER COMPOUNDS.
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An attempt to clarify the conditions under which association of aryl ethylene molecules occurs is described.
- Nizamov,Astanov,Alfimov,Atakhodzhaev
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- Vinylation of aryl bromides using an inexpensive vinylpolysiloxane
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(Chemical Equation Presented) A mild and general method for the palladium-catalyzed vinylation of aryl bromides has been developed. The use of tetrabutylammonium fluoride (TBAF) as the activator and an inexpensive and nontoxic vinyl donor, 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane (D4V, 1), allows for a general and high-yielding preparation of substituted styrenes.
- Denmark, Scott E.,Butler, Christopher R.
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- Libraries for Receptor-Assisted Combinatorial Synthesis (RACS). The olefin metathesis reaction
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A library of alkenes is generated using the olefin metathesis reaction, and converted to a set of diols suitable for a receptor assisted combinatorial synthesis (RACS) experiment with borate as a linker.
- Giger, Thomas,Wigger, Maria,Audétat, Stephan,Benner, Steven A.
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p. 688 - 691
(2007/10/03)
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- Kinetic Isotope Effects as Probes of the Mechanism of Reaction of 1-Naphthylcarbene with Cyclohexane and Toluene
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The rates of reaction of 1-naphthylcarbene (1-NC) in hydrocarbon solution have been measured with excimer laser flash photolysis of 1-naphthyldiazomethane.The kinetic data were obtained by monitoring the growth of the 1-naphthylmethyl radical (1-NCH) at 370 nm.The observed kinetic deuterium isotope effect for the reaction of 1-NC with cyclohexane (cyclohexane-d12) in 2,2,4-trimethylpentane (kH/kD = 1,32 +/- 0.17) and the high CH insertion to H-atom abstraction product ratio are consistent with largely singlet reactivity for 1-NC.In toluene, where addition to the aromatic ring is favored over hydrogen atom abstraction, the measured inverse isotope effect (kH/kD = 0.52 +/- 0.05) also argues for predominantly singlet reactivity and a small singlet-triplet energy gap.The Arrhenius activation parameters measured for the reaction of NC with cyclohexane and toluene were Eact = 2.43 +/- 0.19 kcal/mol, log (A, s-1) = 7.70 +/- 0.15 and Eact = 1.93 +/- 0.38 kcal/mol, log (A, s-1) = 7.28 +/- 0.30, respectively.
- Griffin, G. William,Horn, Keith A.
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p. 4919 - 4926
(2007/10/02)
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- Synthesis of 1H-Cyclobutanaphthalene by Organometallic Methodology
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1H-Cyclobutanaphthalene is preparable by reactions of 1,8-dilithionaphthalene with dichloromethane and 1,8-bis(iodomagnesio)naphthalene with methylene bis(toluene-p-sulphonate).
- Yang, Lau S.,Engler, Thomas A.,Shechter, Harold
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p. 866 - 868
(2007/10/02)
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