Journal ArticleDOI
Nucleophilic substitutions at silicon and phosphorus. a comparison of controlling factors
TLDR
In this paper, the electronic interaction between the incoming nucleophile and the leaving group is shown to be very deep when they are both in the apical position of a tbp intermediate, and the influence of the nucleophile is minimized when the approach of a nucleophile affords a 90° angle, i.e. overall retention at phosphorus.Abstract:
The stereochemical behavior of functional organosilanes is explained considering electronic factors. The reactivity depends on the stereochemistry. Retention and/or inversion are controlled by a frontier orbital process. The same conclusions can be extended to the mechanism of nucleophilic substitution of halogenophosphorus compounds. The kinetic data show that the electronic interaction between the incoming nucleophile and the leaving group is very deep when they are both in the apical position of a tbp intermediate. By contrast, the influence of the nucleophile is minimized when the approach of the nucleophile affords a 90° angle, i.e. overall retention at phosphorus. The hydrolysis of silicates should be certainly more connected to the process of hydrolysis of phosphates through a mechanism involving pseudorotation of the pentacoordinated intermediates.read more
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Journal ArticleDOI
Cyclic pentaoxy siliconates1,2
TL;DR: In this article, the structure of the K, 18-crown-6 salt of O(OCMe2CMe2O)2SiO-t-Bu] (1), formed from the reaction of the bis-pinacol spirosilicate and potassium t-butoxide, was determined by X-ray diffraction.
Book ChapterDOI
Dissociative Pathways in Substitution at Silicon in Solution: Silicon Cations R3Si+, R3Si+ ← Nu, and Silene-Type Species R2Si=X as Intermediates
TL;DR: The role of silylenium intermediates in the synthesis of chiral halosilanes has been discussed in this paper, and the role of the silicon analog of the carbenium ion has been of interest to many organosilicon chemists.
Journal ArticleDOI
Solvolysis of chlorodialkyland diarylphosphines, dialkyl phosphorochloridites and dialkyl phosphinyl chlorides
TL;DR: In this article, the kinetics of solvolysis of chlorodiethylphosphine, chloro(di-n-propyl)phosphines, and chlorodiphenyl phosphine was studied by conductometry in pure ethanol and in various mixed solvents, and was compared with that of dialkyl phosphorochloridites and of Dialkyl and diaryl phosphinyl chlorides.
Journal ArticleDOI
The stereochemistry of nucleophilic substitution at tetracoordinated silicon
TL;DR: Corriu et al. as mentioned in this paper, through the efforts of Corriu1.2a-c and co-workers, has greatly expanded the reaction chemistry of tetra-coordinated silicon compounds.
Journal ArticleDOI
Siloxane, Phosphate, and Hypervalent Formation in Cyclic Silicon and Phosphorus Reactions
TL;DR: In this article, the diol reaction with P(OCH2CF3)3 led to a hexacoordinated structure, via a P[sbnd]S interaction, which was shown to be ∼70% displaced toward an octahedron from a square pyramid based on X-ray analysis.
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