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Class Information
Number: 544/224
Name: Organic compounds -- part of the class 532-570 series > Organic compounds (class 532, subclass 1) > Heterocyclic carbon compounds containing a hetero ring having chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) or nitrogen as the only ring hetero atoms (class 540, subclass 1) > Hetero ring is six-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazines, etc.) > The six-membered hetero ring consists of two nitrogens and four carbons (e.g., 1,2-diazines, etc.)
Description: Compounds in which the six-membered hetero ring consists of two ring nitrogens and four ring carbons.










Sub-classes under this class:

Class Number Class Name Patents
544/225 Heavy metal or aluminum containing 382
544/229 Boron or silicon containing 429
544/230 Spiro 403
544/232 Phosphorus attached directly or indirectly to a 1,2-diazine ring by nonionic bonding 165
544/233 Polycyclo ring system having a 1,2-diazine ring as one of the cyclos 149
544/238 1,2-diazines which contain an additional hetero ring 1,958
544/239 Chalcogen bonded directly to ring carbon of a 1,2-diazine ring 515
544/242 1,3-diazines 963
544/336 1,4-diazines 975


Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

Patent Number Title Of Patent Date Issued
4816063 Thiadiazabicyclononane derivatives, processes for their production and herbicidal compositions Mar. 28, 1989
4810705 Triazolo [3,4-b]pyridazines, process for their preparation and pharmaceutical compositions containing them Mar. 7, 1989
4801718 Thiaiazolyl benzamides Jan. 31, 1989
4798893 Process for producing 1-(5-substituted-2-ethynylphenyl)-2-propanones Jan. 17, 1989
4795757 Bisarylamines Jan. 3, 1989
4791110 Fungicidal pyridazines Dec. 13, 1988
4771061 Substituted piperazine-1,4-naphthalenediones useful for treating asthma, allergic diseases and/or inflammation Sep. 13, 1988
4767765 N-substituted-N-[3-(1,2,4-triazolo-[4,3-b]pyridazin-6-yl )phenyl]alkanamides, carbamates and ureas Aug. 30, 1988
4762932 Haloguanidine intermediates Aug. 9, 1988
4761473 Novel compositions prepared from organic amines and nitrogen-containing aromatic heterocyclic compounds substituted with at least one group selected from carboxylic acid, carboxylic acid ester Aug. 2, 1988
4760179 Substituted aminoxy-propionamides Jul. 26, 1988
4757151 2-substituted-[2-substituted-amino]-N-arylalkyl-3-[indol-3-yl] Jul. 12, 1988
4757142 Process for preparing 6-amino-3-hydrazinopyridazine derivatives Jul. 12, 1988
4755600 Reaction products of pyrazine, pyridine, quinoline and quinoxaline derivatives and 4-isopropenyl-1-cyclohexene-1-carboxaldehyde Jul. 5, 1988
4749701 Aminostyryl compound, leukotriene antagonistic composition containing the same as effective ingredients and method of antagonizing SRS by employing the same Jun. 7, 1988
4748105 Rapid bleach fixing of a silver halide color photographic light-sensitive material using an organic acid ferric complex May. 31, 1988
4743687 Pyridazo (1,2-a) (1,2) diazepine derivatives May. 10, 1988
4740320 Process for preventing corrosion of a metal in contact with a well fluid Apr. 26, 1988
4740229 Cyanoheterocyclic sulfonylureas Apr. 26, 1988
4735650 Pyridazinylurea N-oxide plant regulators Apr. 5, 1988
4731373 Glycerin derivatives and inhibition of blood PAF Mar. 15, 1988
4728355 Pyridazinylurea plant regulators Mar. 1, 1988
4727142 Process for the preparation of imidates Feb. 23, 1988
4725608 Semicarbazide derivatives, processes for preparation thereof and pharmaceutical composition comprising the same Feb. 16, 1988
4723005 Anisotropic compounds and liquid crystal mixtures Feb. 2, 1988
4721711 Pyridazine derivatives active on the central nervous system, and medicaments in which they are present Jan. 26, 1988
4719298 Side chain chlorination process of heterocycles Jan. 12, 1988
4713197 Nitrogen-containing heterocyclic compounds Dec. 15, 1987
4711855 Derivatives of 3,5,3-triiodothyronine Dec. 8, 1987
4710499 New derivatives of pyridazine active on the central nervous system Dec. 1, 1987
4692513 Alpha-L-aspartyl-D-heteroaromatic-substituted glycine esters and amides useful as high intensity sweeteners Sep. 8, 1987
4690917 Imidazopyridayine derivatives having antiviral activity Sep. 1, 1987
4686220 Substituted 2-[b-substituted-amino)-ethylamino]-1,4-naphthalenediones for treating asthma, allergic diseases and inflammation in warm-blooded animals Aug. 11, 1987
4686289 Anisotropic compounds and liquid crystal mixtures Aug. 11, 1987
4681884 Diazine-ethenylphenyl oxamic acids and esters and salts thereof Jul. 21, 1987
4680338 Bifunctional linker Jul. 14, 1987
4678501 Certain pyrazinyl 1,3 cycloalkanedione derivatives having herbicidal activity Jul. 7, 1987
4676604 Liquid crystals Jun. 30, 1987
4677106 Derivatives of 4-methyl 6-phenyl pyridazine, active on the central nervous system Jun. 30, 1987
4675172 Triazolopyrimidine extractants Jun. 23, 1987
4672065 N-substituted phenoxyacetamide fungicides Jun. 9, 1987
4661494 N-substituted-N',N'-disubstituted glycinamide fungicides Apr. 28, 1987
4659502 Ethane derivatives Apr. 21, 1987
4659711 1,2,3,4-Tetrahydrophthalazine and hexahydropyridazine compounds for treating hypertension Apr. 21, 1987
4654343 N-substituted-N[3-(1,2,4-triazolo[4,3-b]pyridazin-6-yl)phenyl]a lkanamides, carbamates and ureas Mar. 31, 1987
4632982 Triphenylmethyl azo and hydrazino substituted pyridazines Dec. 30, 1986
4631280 Pyridazine derivatives having a psychotropic action, and medicaments in which they are present Dec. 23, 1986
4629727 Therapeutic agents Dec. 16, 1986
4628088 Preparation of substituted pyridazines Dec. 9, 1986
4624952 Pyridazine and pyrimidine compounds active on the central nervous system as sedatives or anticonvulsants Nov. 25, 1986

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