302841-08-3Relevant academic research and scientific papers
Heteroorganic betaines 1. Synthesis of betaines containing the +P-C-Si-S- and +P-C-C-S- fragments and their characterization by multinuclear NMR spectroscopy
Borisova, I. V.,Zemlyanskii, N. N.,Shestakova, A. K.,Ustynyuk, Yu. A.,Chernyshev, E. A.
, p. 920 - 928 (2000)
A method for the synthesis of a new class of betaines, viz., R13P+CR2R3SiR4S-, was developed. The experimental evidence for the intermediate formation of betaines R13P+-CR2R3-CR4R5-S- in the Wittig reaction for a series of thiocarbonyl compounds was obtained. A comparative analysis of the NMR spectra of betaines containing the +P-C-Si-S- and +P-C-C-S- fragments was performed.
Heteroorganic betaines 3. * Reactions of betaines containing the +P-C-Si-S- fragment
Borisova,Zemlyanskii,Shestakova,Khrustalev,Ustynyuk,Chernyshev
, p. 933 - 941 (2007/10/03)
The [Ph3P+-CMe2-SiMe2-SEt]Br- salt was prepared by the reaction of betaine Ph3P+-CMe2SiMeR-S- (1a: R = Me) with EtBr. Acetylation of betaine 1a or Et3P+-CHMeSiMe2-S- (2a) afforded 2,2,6-trimethyl-1,3-dioxa-2-silacyclohex-5-ene-4-thione Me2SiOC(=S)CH=C(Me)O or the [Et3P+-CHMeSiMe2Cl]Cl- salt depending on the reagent ratio. The reactions of betaines 1a,b (1b: R = Ph) or 2 with compounds (R3Sn)2X (X = O or NMe) can be used for the generation of silanones [RMeSi=O] and silaneimines [RMeSi=NMe] in solutions. The reactivity of betaines Ph3P+-CHR1SiMeR2-S- (R1 = H or Me and R2 = Me or Ph) is determined by the equilibrium between the zwitterionic and ylide Ph3P=CR1SiMeR2SH tautomers that exist in solutions.
