Abstract: A compound is disclosed having the formula: ##STR1## The compound is useful as an active ingredient in a herbicidal composition.

Abstract: A compound is disclosed having the formula: ##STR1## The compound is useful as an active ingredient in a herbicidal composition.

Abstract: New herbicidal pyridine and pyrimidine derivatives of general formula (I), ##STR1## wherein Z represents a nitrogen atom or a C--H group; A represents an optionally substituted aryl group or an optionally substituted 5- or 6-membered nitrogen-containing heteroaromatic group; n represents an integer from 0 to 2 and R.sup.1 or each R.sup.1 independently represents a hydrogen atom or an optionally substituted alkyl, alkoxy, alkylthio or dialkylamino group; m represents an integer from 0 to 5 and R.sup.2 or each R.sup.2 independently represents a hydrogen or a halogen atom or an optionally substituted alkyl, haloalkyl, haloalkoxy, alkoxy, alkylthio group or a nitro, cyano or a halosulphonyl group; and X represents an oxygen or sulphur atom.

Abstract: A herbicidal composition which comprises at least one carrier and, as active ingredient, a compound of the general formula ##STR1## in which each of n and m independently is 0 or 1; each of Ar.sup.1 and Ar.sup.2 independently is an aryl group, at least one of Ar.sup.1 and Ar.sup.2 being substituted by one or more of the same or different substituents selected from halogen atoms, alkyl groups, alkoxy groups, haloalkyl groups and haloalkoxy groups; and R.sup.1 is hydrogen, or an alkyl, alkylthio or haloalkyl group having from 1 to 4 carbon atoms, and R.sup.2 is hydrogen or a halogen atom provided that at least one of R.sup.1 and R.sup.2 represents a hydrogen atom. Certain compounds of formula I are novel.

Abstract: A medicine having a synergistic activity containing a combination of azelastine and theophylline or azelastine and at least one .beta.-mimetic.

Abstract: Aqueous solutions of free, neutral .alpha.-amino acids are recovered from aqueous solutions of their alkali-metal salts. Two equally large rectifying columns filled with a strongly acidic cation exchanger in the H.sup.+ form are used, the discharge of the first column being connected to the head of the second column. The solution of the alkali-metal salt is at first delivered to the head of the first column, then the residual solution, reduced by the alkali-metal cations adsorbed in the exchanger, is displaced to the second column by means of the addition of water. A product-free forerun is first separated at the discharge of the second column and, when free .alpha.-amino acid begins to exit in the flow-off from the second column, the receiver is changed and the delivery of water to the head of the first column continues further until a mixed pH between 5 and 7 has been achieved in the receiver.

Abstract: The nuclear hydroxylation of phenol can be carried out in an industrially very simple manner and with at least the yields obtained with the known methods as well as with very good selectivities by means of using aqueous hydrogen peroxide with the simultaneous addition of sulfur dioxide or selenium dioxide as catalyst.

Abstract: The nuclear hydroxylation of substituted phenols is performed by using aqueous hydrogen peroxide in the presence of sulfur dioxide or selenium dioxide as catalyst in a simple manner with very good space-time yields and good product yields.

Abstract: There are prepared compounds of the formula ##STR1## where >A--B-- has either the structure >C(OH)--CH.sub.2 -- or the structure >C.dbd.CH, Alk is a straight or branched chain C.sub.1 -C.sub.5 - alkylene group and -NHY is ##STR2## where R' is hydrogen, phenyl, phenyl substituted once or twice by C.sub.1 -C.sub.4 -alkyl groups, a C.sub.1 -C.sub.4 -alkoxy group or by halogen atoms, a C.sub.1 -C.sub.6 -alkyl group, a C.sub.1 -C.sub.4 -hydroxyalkyl group or a phenalkyl group whose alkyl portion consists of 1-4 carbon atoms or such a phenalkyl group containing 1 to 3 C.sub.1 -C.sub.4 -alkoxy group substituents. The compounds are effective in improving peripheral and cerebral circulation. There are also produced intermediate compounds of formula (II) where NHY is replaced by chlorine, bromine or iodine.

Abstract: Pyridines substituted in the 2- and 6-positions by an aromatic or heteroaromatic group are prepared by reacting an aromatic or heteroaromatic ketone having at least one reactive methylene group adjacent to the keto group with an aliphatic aldehyde and ammonia in the presence of a dehydrating and dehydrogenating catalyst at a temperature of about 250.degree. to 550.degree. C.