- Process for Production of Alkyl Tin Alkoxide Compound, and Process for Production of Carbonic Acid Ester Using the Compound
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The present invention provides a process for producing: a compound represented by XOR2; a dialkyl tin dialkoxide compound having one tin atom, two Sn—R1 bonds and two Sn—OR2 bonds; and/or a tetraalkyl dialkoxy distannoxane compound having one Sn—O—Sn bond, in which each tin atom of the tetraalkyl dialkoxy distannoxane compound has two Sn—R1 bonds and one Sn—OR2 bond, the process comprising reacting in the absence of a catalyst at least one alkyl tin compound selected from the group consisting of i) and ii) below: i) a dialkyl tin compound having one tin atom, two Sn—R1 (wherein R1 represents an alkyl group) bonds, and two Sn—OX bonds (wherein OX is a group in which HOX that is a conjugate acid of OX is a Bronsted acid having a pKa of from 0 to 6.8); andii) a tetraalkyl distannoxane compound having one Sn—O—Sn bond, in which each tin atom of the tetraalkyl distannoxane compound has two Sn—R1 bonds and one Sn—OX bond (wherein OX is a group in which HOX that is a conjugate acid of OX is a Bronsted acid having a pKa of from 0 to 6.8); anda carbonic acid ester represented by R2OCOOR2 (wherein R2 represents a linear or branched, saturated or unsaturated hydrocarbon group, a hydrocarbon group having a saturated or unsaturated cyclic hydrocarbon substituent, or a Y—CH2— group (wherein Y represents an alkyl polyalkylene group, an aromatic group or a cyclic saturated or unsaturated alkylene ether group)), and/oran alcohol represented by R2OH (wherein R2 is the same as defined above).
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Page/Page column 59-60
(2010/12/18)
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- PROCESS FOR PRODUCTION OF DIALKYLTIN DIALKOXIDES
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An object of the present invention is to provide a process for producing a dialkyl tin compound from a composition of deactivated forms of a dialkyl tin catalyst, and to provide a process for producing the dialkyl tin catalyst from the dialkyl tin compound and using the dialkyl tin catalyst to produce a carbonic acid ester. According to the present invention, a process for producing a dialkyl tin compound is provided that subjects a composition of the deactivated forms of the dialkyl tin catalyst, formed when producing an ester compound, to an alkyl group redistribution reaction and/or dealkylation reaction.
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Page/Page column 34
(2009/07/25)
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- Reactions of Organoytterbium Compounds RYbI (R = Me, Et, Ph) with Organotin Oxides and Acetates
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Reactions of RYbI (R = Me, Et, Ph) with organotin oxides and acetates) involve cleavage of the Sn-O bonds to form tetrasubstituted stannanes mostly as single or main reaction products (yields 65-96 percent). A similar results was obtained in reaction of PhYbI with diphenyltin sulfide (yield 93 percent). However, reactions of RYbI (R = Me, Et, Ph) with Bu2SnO, followed by hydrolysis of the reaction mixtures lead to hydroxystannanoxanes Bu2RSnOH in 66-75 percent yields.
- Rybakova, L. F.,Syutkina, O. P.,Novgorodova, M. N.,Petrov, E. S.
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- Steric effects on the formation of isolable products in the reactions of dibutyltin oxides with carboxylic acids
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Reaction of dibutyltin oxides, xBu2SnO with carboxylic acids iPr) and (CH3)3C(tBu)> in 1:1 and 1:2 stoichiometry were inve
- Mokal, V.B.,Jain, V.K.
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p. 215 - 226
(2007/10/02)
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- Stereochemistry of the thermal decomposition of (2-(acyloxy)alkyl)triorganostannanes
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The stereochemical study of the thermal decomposition of (2-(acyloxy)alkyl)triorganostannanes revealed an anti β-elimination of (acyloxy)triorganostannanes. The process is highly stereospecific and not perturbed by the presence of a possible internal chelation favoring syn elimination. It corresponds to an open transition state. Kinetics of β-elimination in cyclohexyl and norbornyl systems showed that the reaction is much more rapid with a 180° dihedral angle between the metal and the ester group than with a 60° angle between the two. Stabilization of the partial positive charge developed during the transition state occurs mainly through hyperconjugation effect.
- Jousseaume, Bernard,Noiret, Nicolas,Pereyre, Michel,Francès, Jean-Marc,Pétraud, Michel
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p. 3910 - 3914
(2008/10/08)
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- New latent organotin catalysts: Preparation and mechanism of the thermal decomposition of bis(2-(acyloxy)alkyl)diorganotins
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New organotin compounds, bis(2-(acyloxy)alkyl)diorganotins, can be thermally decomposed into diorganotin dicarboxylates. The substituent effects on the reaction parameters are studied, and a possible mechanism for the decomposition is proposed. These tetr
- Jousseaume, Bernard,Gouron, Véronique,Maillard, Bernard,Pereyre, Michel,Francès, Jean-Marc
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p. 1330 - 1331
(2008/10/08)
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