p-Bis-(trimethylsilyl)benzene

Abstract

1787significantly longer than the others (Table 5). The Se-O bond lengths seem to be correlated with the number of hydrogen bonds formed by the corresponding oxygen. The shortest Se-O(4) bond equal to 1.628 A results probably from the fact that 0(4) forms one hydrogen bond only. The oxygens O(1) and O(3), with intermediate bond distances (1.638 and 1.640 A), form two hydrogen bonds each, while the Se-O(2) distance, equal to 1.673 A, takes part in three hydrogen bonds.Our preliminary results on the crystal structure of diglycine sulphate indicate that (NH3CH2COOH)2SeO4 and (NH3CH2COOH)2SO4 are isomorphous.

In Pursuit of an Acetylenedithiolate Synthesis

“…[a] X = SiR 3 [15] X = PR 2 [16] X = SR [17,3b] Alkyl-X 1,4-(Me 3 Si) 2 in highly colored solutions. However, independently of the reaction time or temperature, subsequent alkylation with benzyl bromide did not yield 3a, whereas 3c could not be recovered.…”

Structure of cyclo-1,1',4,4'-bis(1,1,3,3-tetramethyl-1,3-disiloxanediyl)dibenzene

“…1. The structure is discussed in comparison with three closely related structures: p-bis(hydroxydimethylsilyl)benzene (II) (Alexander, Northolt & Engmann, 1967), 1,1,2,2, 9,9,10,10-octamethyl-1,2,9,10-tetrasila[2.2]-paracyclophane (III) (Sakurai, Hoshi, Kamiya, Hosomi & Kabuto, 1986) and p-bis(tetramethylsilyl)benzene (IV) (Menczel & Kiss, 1975). The Si to the phenyl-ring C bonds are in good agreement with their counterparts in (II), (III) and (IV).…”