Merck Patent Gesellschaft MIT Beschrankter Haftung

Merck Patent Gesellschaft MIT Beschraenkter Haftung

Dietrich Erdmann

Ludwig Pohl

Herbert Schumann

Holger Jurgensen

Martin Hostalek

Meino Heyen

Uwe Hartmann

Rudolf Eidenschink

Wilfried Wassermann

Max E Van Ghemen

Joachim Krause

Georg Weber

Matthias Lokai

Jurgen Gehlhaus

Gerhart Schneider

Wolfgang Koch

Use of organometallic compounds to deposit thin films from the gas phase

In a process for the production of thin films and epitaxial layers by gas-phase deposition, intramolecularly stabilized organometallic compounds are employed as a source of metal.

Organometallic compounds

The invention relates to cyclic organometallic compounds which are intramolecularly stabilized and also to their use to produce thin films and epitaxial layers by gas-phase deposition.

Cyclic organometallic compounds

New dichroitic dyestuffs useful as components of liquid crystalline dielectrics for electro-optical indicator elements based on the guest-host effect have the formula ##STR1## wherein W, X, Y and Z each is hydrogen, NH.sub.2, OH, NHCH.sub.3 or NHC.sub.2 H.sub.5, provided that not more than 3 of these are the same, and one or two of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are a group of the formulae (IIa), (IIb), (IIc), (IId) or (IIe) ##STR2## and the others are hydrogen, R being alkyl of 1-12 carbon atoms.

Dichroitic anthraquinone dyestuffs useful in liquid crystalline

Compounds of the formula ##STR1## wherein R.sub.1 is alkyl of 1-12 C atoms and R.sub.2 is an optionally perfluorinated alkyl, alkoxy or alkanoyloxy group, each of 1-12 C atoms are valuable liquid crystalline components for broadening the mesophase temperature range of liquid crystalline dielectrics having negative dielectric anisotropy.

Cyclohexylbiphenyls, their preparation and use in dielectrics and

Biphenyl derivatives of the formula: ##STR1## wherein X is --CO--O-- or --O--CO--, R.sub.1 and R.sub.4 are alkyl of 1 to 10 carbon atoms, and one of R.sub.2 and R.sub.3 is CN and the other is H, are useful for lowering the dielectric anisotropy of liquid crystalline dielectrics.

Cyano-substituted biphenyl compounds and liquid crystalline dielectrics

Benzoin oximes of the formula ##STR1## wherein R.sup.1 is alkyl of 3 to 16 carbon atoms, alkenyl of 3 or 4 carbon atoms, 3,7-dimethyl-2,6-octadienyl-1, or -A-S-R.sup.4 ; R.sup.2 and R.sup.3 independently are H, methyl or chlorine; R.sup.4 is alkyl or 1 to 8 carbon atoms; and A is alkylene of 3 or 4 carbon atoms, are chelating agents for copper.

Novel chelate formers

3-Cyano-4-phenyl-5-dimethylaminomethylene-5H-furanone-(2) and compositions containing the same, are useful for controlling the growth of undesirable pest plant growth, e.g., algae, weeds and undesirable grasses, when applied to the locus to be protected.

Growing community of inventors

Muhltal-Traisa, Germany

Dietrich Erdmann