Preparation, crystal structure and thermal decomposition study of some trimethylsilyl esters of dicarbamic acids

Surprisingly great difference in reactivity depending upon the ring size: solvolysis and molecular structure study of some N-trimethylsilylated cyclic ureas

“…The preparation, the physical and spectroscopic data of the silyl-ureas 1a,b, 2a,b and 3 are discussed in [4]. Crystals of 1a and 2a suitable for X-ray diffraction study were obtained by vacuum sublimation.…”

“…In a previous publication, we described the preparation of some N-trimethylsilylated cyclic ureas (1a,b, 2a,b and 3) resulting from the thermal decomposition of silylated dicarbamic acid derivatives [4].…”

Converting Carbon Dioxide into Carbamato Derivatives

“…Trimethylsilyl carbamato complexes have also been obtained from SiMe 3 Cl with a bidentate amine (e.g., ethylenediamine, propylenediamine) and CO 2 with, or without a catalyst . Scheme refers to the reaction with ethylenediamine.…”

“…The product appearing in Scheme , SiMe 3 [O 2 CN(SiMe 3 )(CH 2 ) 2 (SiMe 3 )NCO 2 ]SiMe 3 , has been studied by X-ray diffraction { TEXHIN -CDC}. Two additional products, derived from propylenediamine, have been synthesized, one similar to the preceding one with the propylene bridge (CH 2 ) 3 , and a third one, which contains a propylene bridge and two carbamato groups{ TEXHUZ -CDC}, of formula SiMe 3 [O 2 CNH(CH 2 ) 3 NHCO 2 ]SiMe 3 …”

CO2 as an Oxygen Source for Polysiloxanes – Preparation, Crystal Structure and Thermal Decomposition of Two Novel Silylcarbamates

“…Few authors described the insertion of two CO 2 molecules into bis-aminosilanes [4 -6]. Szalay et al prepared trisilylesters of dicarbamic acids [7], while Belli Dell'Amico et al described a homoleptic compound starting form SiCl 4 , R 2 NH and CO 2 [8]. Walther et al inserted CO 2 into a Si-N bond in a nickel complex [9].…”