- Silacyclohexanone compound and a method of preparing a silacyclohexane-type liquid crystal composition containing it
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A silacyclohexanone compound represented by the following general formula (I). STR1 wherein Ar denotes a phenyl group or a tolyl group. R denotes a tolyl group, a linear-chain alkyl group with a carbon number of 2-10, a mono- or di-fluoroalkyl group with
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- Reaction of Thioketones with Carbonyl Oxides and 3,3-Dimethyl-1,2-dioxirane. Cycloaddition vs. Oxygen Atom Transfer
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The ozonolysis of vinyl ethers 1a, b in the presence of adamantane-2-thione 4a and bicyclononan-9-thione 4b gave in each case the corresponding thioozonides 5a-c in moderate yields, whilst ozonolysis of a mixture of vinyl ethers 1a-d and thiobenzophenone derivatives 4f-h gave the corresponding thione S-oxides 8f-h in isolated yields of 10-40percent, together with the benzophenones 7f-h. 3,3-Dimethyl-1,2-dioxirane, generated in situ from the reaction of acetone and 'oxone' (2KHSO5-KHSO4-K2SO4), transferred an oxygen atom to compounds 4a, f, g, i providing the thione S-oxides 8a, f, g, i in 29-97 percent yield.
- Tabuchi, Toshihiko,Nojima, Masatomo,Kusabayashi, Shigekazu
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p. 3043 - 3046
(2007/10/02)
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- Steric Effects on Reaction Rates - III. Application of Force-Field Calculations to Chromic Acid Oxidation of Alcohols
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The rates of oxidation with chromic acid of 15 bi- and polycyclic secondary alcohols have been measured and correlated with strain changes calculated by the MM1-program between the alcohols and the corresponding ketones.A correlation of the same quality is obtained upon representation of OH-strain by CH3-strain.The significance of the correlations with respect to the oxidation mechanism as well as the limitations of the applicability of force-field calculations to reactivity problems are discussed.
- Mueller, Paul,Blanc, Jacky,Lenoir, Dieter
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p. 1212 - 1220
(2007/10/02)
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- STREIC EFFECTS ON REACTION RATES II: RATE AND EQUILIBRIUM CONSTANTS FOR OXIDATION OF BICYCLIC ALCOHOLS
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Equilibrium constants for oxidation of a series of bicyclic alcohols with cyclohexanone have been determined under Meerwein-Pondorf conditions.The data provide the thermodynamic background for interpretation of the mechanism of alcohol oxidation and ketone reductions.Free energies of the equilibrium (ΔGox) are compared with values calculated by molecular mechanics.
- Mueller, Paul,Blanc, Jacky
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p. 715 - 718
(2007/10/02)
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- Cyanidation Products of Organoboranes Derived from Linalyl Acetate
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The seven-membered cyclic borane obtained from the reaction of linalyl acetate and thexylborane loses 2,3-dimethylbut-2-ene, and the resulting dialkulborane gives an alcohol on treatment with sodium syanide, followed by trifluoroacetic anhydride and oxidation.The structure is confirmed by synthesis.The generality of this reaction was investigated but, of the dialkylboranes examined, only 9-borabicyclononane participated in the cyanidation procedure.A simple synthesis of menthone is presented
- Murphy, Roger,Prager, Rolf H.
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p. 143 - 150
(2007/10/02)
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