New Diazasilaphosphetidines and their Precursors

Abstract

A series of aminosilanes (R′HN)2SiR2: have been prepared. In case of bulky substituents R′ the aminolysis of Ph2SiCl2 stops at the (R′HN)ClSiPh2 stage. Replacement of the Cl atom is achieved with LiNHR′ which allows the synthesis of mixed bisaminosilanes (R′HN)(R″HN)SiPh2. The X-ray structures of three of these compounds have been determined. There are no intermolecular N-H···N hydrogen bonds in these compounds in the solid state. Several 1,3,2,4-diazaphosphetidines have been synthesized using bis(N-lithioamino)silanes and bis(N-lithioamino)phosphanes . Amongst these the heterocycle 18 possesses an almost planar four membered N2SiP ring system.

Synthesis, characterization and structures of diphenyldiaminosilanes bearing bulky substituents on nitrogen

“…Owing to the very weak nature of Si Ã/N bonds in aminosilanes and M Ã/N bonds in their metal complexes, it is desirable to append bulky R groups to the silicon and nitrogen centers and achieve increased kinetic stability of the final metal complexes. Nöth and coworkers have described a series of bulky aryldiamonosilanes [(RNH)(R?NH)SiPh 2 ] (R or R?0/ t Bu or i Pr) and studied their molecular structures by X-ray diffraction studies [8]. Subsequently, Kang and co-workers have synthesized complexes based on cycloalkyldiaminosilane ligands (C, D) [9].…”

Inorganic Heterocyclic Bis(phosphines): Syntheses and Structures of a 1,2-Bis(diazasilaphosphetidino)ethane and Its Nickel, Molybdenum, and Rhodium Complexes

“…Both the slightly asymmetrical P-N bonds (1.7278(16) Å) and the symmetrical Si-N bonds (1.7139(17) Å) have similar lengths as those in related diazasilaphosphetidines. [45][46][47][48] To assess the structural and electronic properties of bdpe, we synthesized nickel(II) and molybdenum(0) derivatives for which bis(diphenylphosphino)ethane (hereafter dppe) complexes are known. While 2 bears much closer resemblance to the cyclic organic phosphines A and B, very limited structural information on metal complexes of these ligands, other than rhodium, is available.…”

The crystal structure of 2-chloro-1,3-bis(2,4,6-trimethylphenyl)-4,4-dimethyl-1,3,2λ3,4-diazaphosphasiletidine

“…Their synthesis was rst described more than 50 years ago [1] while their reaction and coordination behavior has been extensively studied during the following years [2][3][4][5][8][9][10][11][12]. Particularly diazaphosphasiletidines resulting from this versatile silylamine precursors have attracted considerable attention in phosphorus chemistry [2][3][4][5].…”

“…The title compound was prepared according to common procedures under argon atmosphere in oven-dried glassware using Schlenk techniques [1][2][3][4][5]. In a typical reaction, 1.3 g (3.9 mmol) N,N′-bis (2,4,6-trimethylphenyl …”