Ivoclar Vivadent Ag

Evonik Operations Gmbh

Michael Haas

Norbert Moszner

Urs Karl Fischer

Iris Lamparth

Yohann Catel

Odo Wunnicke

Urs-Karl Fischer

Harald Stüger

Georg Gescheidt Demner

Michael Holthausen

Pascal Fässler

Judith Radebner

Thomas Lainer

Georg Gescheidt-Demner

A method is useful for preparing partially hydrogenated chlorosilanes by selective hydrogenation with a compound of the formula RAlH, wherein R is a branched or cyclic hydrocarbon. Partially hydrogenated chlorosilanes can be prepared with said method, in particular partially hydrogenated chlorosilanes represented by the formula ClSiSi(SiH), (ClSi)Si(SiH)or HSi(SiH)SiCl.

Partially hydrogenated chlorosilanes and methods for preparing same by selective hydrogenation

Compounds according to general formula (I) in which M is Ge or Sn, RAr is R, R, R, R, R, independently of one another in each case, are &#x2014;H, &#x2014;F, &#x2014;Cl, &#x2014;OR, &#x2014;SR, &#x2014;N(R), &#x2014;CF, &#x2014;CN, &#x2014;NO, &#x2014;COOR, &#x2014;CONHR, a branched, cyclic or preferably linear Calkyl, Calkenyl, Calkyloxy or a Calkenoxy radical, which can be interrupted one or more times by O, S or &#x2014;NR&#x2014; and substituted by one or more polymerizable groups and/or radicals R, Ris H, a branched, cyclic or preferably linear Calkyl or Calkenyl radical, Ris a chemical bond, an n-valent aromatic radical or a branched, cyclic or preferably linear Calkylene radical, which can be interrupted one or more times by O, S or &#x2014;NR&#x2014; and substituted by one or more polymerizable groups, &#x2550;O and/or radicals R, n is 2 or 3 and m is 0 or 1. The compounds are particularly suitable as photoinitiators for radical polymerization and in particular for the production of dental materials.

Long-wave absorbing photoinitiators

Acyl germanium compound according to general formula [RAr&#x2014;(C&#x2550;O)&#x2014;]&#x2014;Ge and process for the preparation thereof. The compound is suitable as initiator for radical polymerization.

Acyl germanium photoinitiators and process for the preparation thereof

Growing community of inventors

Graz, Austria

Michael Haas