Betty Günther

Synthesis and structure determination of a novel diastereomeric diaminodichlorodisilane

Abstract Different aromatic diorganoamines were tested for their reactivity with 1,1,2,2-tetrachlorodimethyldisilane (1). Indole reacts easily with 1, tetrakis(indolyl)-1,2-dimethyldisilane (2) was isolated. The reaction of N-methylaniline with 1 yields (MePhN)2MeSi–SiMe(NMePh)Cl (3) and Cl(MePhN)MeSi–SiMe(NMePh)Cl (4) depending on the proportions of the starting materials. The crystal structure of 4 shows that the compound crystallizes as separated pure enantiomeric crystals. The value of optical rotation was estimated.

Formation of a silicon-containing macrocycle with a pyridoxalimine Schiff base ligand

The reaction of dichlorodiphenylsilane with a polydentate Schiff base ligand derived from pyridoxal and 2-hydroxyaniline yields the macrocyclic centrosymmetric silicon compound 9,27-dimethyl-3,3,21,21-tetraphenyl-2,4,20,22-tetraoxa-8,13,26,31-tetraaza-3,21-disilapentacyclo[30.4.0.0(6,11).0(14,19).0(24,29)]hexatrideca-1(32),6,8,10,12,14,16,18,24,26,28,30,33,35-tetradecaene-10,28-diol chloroform tetrasolvate, C(52)H(44)N(4)O(6)Si(2) x 4CHCl(3). The asymmetric unit contains half of the macrocycle and two molecules of chloroform, with C-H...O and C-H...N contacts binding the two guests to the host in the crystal structure. This macrocyclic silicon compound represents a promising host for molecular-recognition processes and for the construction of nanostructures.

Synthesis and structure determination of bis(1,3-di-tert-butylcyclopentadienyl)(divinyl)hafnium

Abstract The reaction of (t-Bu2C5H3)2HfCl2 (1) with vinyllithium yield ivory coloured crystals identified as (t-Bu2C5H3)2Hf(CHCH2)2 (2). The X-ray structure analysis of 2 shows the presence of the divinyl complex, whereby one of the vinyl groups is partially replaced by chlorine (25%).

4-[(2-Hydroxyethyl)iminomethyl]-5-hydroxymethyl-2-methylpyridin-3-ol

The title compound, C(10)H(14)N(2)O(3), is a Schiff base which is derived from pyridoxal and represents, therefore, a vitamin B(6)-related compound. Molecules are linked into sheets by a combination of O-H...O and O-H...N hydrogen bonds.

2,2-Dichloro-1,3-bis(trimethylsilyl)-1,3-diaza-2-silacyclopentane

In the title compound, C(8)H(22)Cl(2)N(2)Si(3), the central Si atom is tetrahedrally coordinated by two Cl and two N atoms in a molecule that has crystallographically imposed C(2) symmetry. Comparison is made with the isomorphous structure having titanium instead of silicon at the central position in the diazacyclopentane ring [Tinkler, Deeth, Duncalf & McCamley (1996). Chem. Commun. pp. 2623-2624].