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The silicon effect also manifests in certain compound properties. Trimethylsilylmethylamine (Me 3 SiCH 2 NH 2) is a stronger base (conjugate pK a 10.96) than neopentylamine (conjugate pK a 10.21); trimethylsilylacetic acid (pKa 5.22) is a poorer acid than trimethylacetic acid (pKa 5.00). [1]
Negative hyperconjugation is seldom observed, though it can be most commonly observed when the σ *-orbital is located on certain C–F or C–O bonds. [ 3 ] [ 4 ] In negative hyperconjugation, the electron density flows in the opposite direction (from a π- or p-orbital to an empty σ * -orbital) than it does in the more common ...
Half Gone: Oil, Gas, Hot Air and the Global Energy Crisis: Jeremy Leggett: 2005 The History of the Standard Oil Company: Ida M. Tarbell: 1904 Hot, Flat, and Crowded: Why We Need a Green Revolution--And How It Can Renew America: Thomas L. Friedman: 2008 The Hype about Hydrogen: Fact and Fiction in the Race to Save the Climate: Joseph J. Romm: 2004
A silicone oil is any liquid polymerized siloxane with organic side chains. The most important member is polydimethylsiloxane . These polymers are of commercial interest because of their relatively high thermal stability and their lubricating properties.
Hyperconjugation can be used to rationalize a variety of chemical phenomena, including the anomeric effect, the gauche effect, the rotational barrier of ethane, the beta-silicon effect, the vibrational frequency of exocyclic carbonyl groups, and the relative stability of substituted carbocations and substituted carbon centred radicals, and the thermodynamic Zaitsev's rule for alkene stability.
Silicon compounds are compounds containing the element silicon (Si). As a carbon group element, silicon often forms compounds in the +4 oxidation state, though many unusual compounds have been discovered that differ from expectations based on its valence electrons, including the silicides and some silanes. Metal silicides, silicon halides, and ...
High purity semiconductor-grade HSQ has been investigated as a negative resist in photolithography and electron-beam (e-beam) lithography. [2] HSQ is commonly delivered in methyl isobutyl ketone and can be used to form 0.01–2 μm films on substrates/wafers.
Oil 101 is a 2009 book by New York based American commodities trader Morgan Downey. [1] Downey has been cited in the press as an expert in oil markets, [2] [3] Oil 101 was called a "must read" by a Financial Times blogger. [4] and a leading oil blog reviewed the book as an addition to its select group of top oil books. [5]