Chinoin Gyogyszer Es Vegyeszeti Termekek Gyara Rt.

Magyar Tudomanyos Akademia

Pecsi Dohanygyar

Istvan Bitter

Istvan Hermecz

Agnes Horvath

Zoltan Meszaros

Lelle V Vasvari Nee Debreczy

Laszlo Toke

Sandor Virag

Attila Mandi

Gyula Sebestyen

Gabor Nagy

Erno Pungor

Tibor Breining

Jeno Havas

Tamas Szucs

Bela Gai

Erno Lindner

Klara Szepesvary Nee Toth

Gabor T Szabo

Rudolf Soos

Geza Toth

Todor Pfliegel

Istvan Rusznak

Lajos Trezl

Adam Molnar

Viktoria Horvath

Sandor Irimi

Jozsef Gabor

Laszio Toke

Eva Karpati Nee Adam

Maria Horvath

Sandor Hernadi

Maria Forro Nee Horvath

A process for producing cigarette filters comprising a compound containing L-ascorbic acid and having the compound added to an adsorptional filter material in a quantity of 5-200% of the amount of said adsorptional filter.

Process for producing tobacco filter to adsorb materials harmful to

The invention relates to new crown ether derivatives of the general Formula I ##STR1## and a process for the preparation thereof wherein Z.sup.1 is a group of the general Formula ##STR2## R.sub.a and R.sub.b may be the same or different and R.sub.a represents an alkyl group having 1-4 carbon atoms and R.sub.b is an alkyl group having 1-20 carbon atoms. The new crown ethers are useful in the preparation of ion-selective electrodes having a long lifetime.

New crown ether derivatives, process for the preparation thereof and

Crown ether compounds, process for the preparation of the crown ether

Compounds of the formula I ##STR1## or pharmaceutically acceptable salts, hydrates, stereoisomers, optically active isomers, geometrical isomers or tautomeric forms thereof are disclosed wherein

Nitrogen bridgehead compounds having anti-allergic effect

The invention relates to a process for the preparation of acyl ureas of formula (I) ##STR1## wherein R.sub.1 and R.sub.2 are the same of different and each is halogen atom, preferably fluorine or chlorine atom, and

Process for the preparation of substituted acyl ureas

The invention concerns a new process for the preparation of polyhalogenphenyl carbamates of the formula (I)

Process for the preparation of polyhalogenphenyl carbamates

Nitrogen bridgehead compounds (pyrido-[1,2-a]-pyrimidine derivatives) which are useful intermediates in the making of known compounds of this class and which themselves possess PG-antagonist, analgesic, antiartheriosclerotic, tranquilizing and like pharmaceutical activity.

Substituted-4-oxo-1,6,7,8-tetrahydro-4H-pyrido[1,2-a]pyrimidines

Antiallergic and particularly antiasthmatic compounds of the formula: ##STR1## of which 9-phenylhydrazono-6-methyl-4-oxo-6,7,8,9-tetrahydro-4H-pyrido(1,2-a)pyrimi dine-3-carboxylic acid is an especially significant example.

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Budapest, Hungary

Istvan Bitter