Showing papers on "Pyrazoline published in 1984"

Soil treating method and composition for conserving nitrogen in soil

Abstract: Certain pyrazoline compounds are employed as the active nitrification inhibitor in the presence of reduced nitrogen fertilizers.

Oxazoline, Thiazolin und Pyrazolin als Heterodienophile in der [4+2]-Cycloaddition mit inversem Elektronenbedarf

Abstract: Die elektronenreichen C=N-Doppelbindungen in den Oxazolinen 5a–b und 10, im Thiazolin 7 sowie im Pyrazolin 13 zeigen gegenuber dem in den Tetrazinen 1a–bs-cis-fixierten Azinsystem ausgepragte dienophile Eigenschaften und fuhren nach [4+2]-Cycloaddition und Stickstoffeliminierung zu den neuen, anellierten Triazinderivaten 6, 8 und 15. Oxazolines, Thiazoline and Pyrazoline as Heterodienophiles in [4+2] Cycloadditions with Inverse Electron Demand The electron rich C=N bonds in the oxazolines 5a–b and 10, in the thiazoline 7 and in the pyrazoline 13 are effective dienophiles towards the s-cis-azine system in the tetrazines 1a–b. Through [4+2] cycloaddition and elimination of nitrogen novel fused derivatives of triazine, such as 6, 8 and 15, are formed.

Reaction of 2-methyl-1,4-naphthoquinone and its 3-substituted derivatives with active methylene group anions and with diazo compounds

Abstract: The reaction of 2-chloro-3-methyl-1,4-naphthoquinone (3) with the anion of ethyl cyanoacetate led to a mixture of two epimeric fused-ring cyclopropane compounds, characterised as exo- and endo-1-cyano-1 -ethoxycarbonyl-1a-methyl-1a,7a-dihydro-1H-cyclopropa[b]naphthalene-2,7-dione (8) and (9). Various hydrolysis products of these were prepared and an X-ray crystallographic analysis was carried out on one of them, 1-carbamoyl-1 -carboxy-1a-methyl-1a,7a-dihydro-1H-cyclopropa[b]-naphthalene-2,7-dione (17). The reaction of 2-methyl-1,4-naphthoquinone (1) with ethyl diazoacetate gave a fused pyrazoline derivative, 3-ethoxycarbonyl-4-hydroxy-9a-methyl-1,9a-dihydro-benz[f]indazol-9-one (22), while reaction of 2-methyl-3-nitro-1,4-naphthoquinone (5) with diazomethane led to a fused Δ2-isoxazoline N-oxide, 3a-methyl-3,3a-dihydroisoxazolo[3,4-b]naphthalene-4,9-dione 1-oxide (26).

Preparation of aminopyrazolines and intermediates used therein

Abstract: A process for the preparation of 3-(N-substituted amino)-2-pyrazolines, of formula (I) which comprises (i) reacting of a compound of formula (II) with a compound serving to effect substitution of a group R' on the amino group attached to the 3-position of the pyrazoline ring in the compound of formula (II), thereby to form a compound of formula (III) and converting the compound of formula (III) to a compound of formula (I) or an acid addition salt thereof. Certain of the intermediates of formula (III) are novel and possess pharmacological activity.

Single layer type electrophotographic sensitive body

Abstract: PURPOSE:To eliminate an induction effect and to improve the sensitivity of the titled sensitive body using photoconductive phthalocyanine powder in the visible light region by incorporating a specified disazo pigment and a specified pyrazoline compound into the photosensitive layer. CONSTITUTION:A disazo pigment represented by formula I (where X is -OCH3 or Cl) such as Dian blue and a pyrazoline compound represented by formula II[where (n) is 0 or 1, and each of A, A1 and A2 is aryl] such as 1-phenyl-3-(p- dimethylaminostyryl)-5-(p-dimethylaminophenyl)-pyrazoline are used as sensitizers. A photoconductive coating material is prepd. by kneading photoconductive phthalocyanine powder with said disazo pigment, said pyrazoline compound and a binder resin, and the coating material is applied to an electrically conductive support to form a photosensitive layer of about 2-20mum thickness. Thus, a single layer type electrophotographic sensitive body is obtd.

Pyrazoline compounds compositions and use

Abstract: There are described compounds of formula I, ##STR1## in which Ar 1 and Ar 2 , which may be the same or different, each independently represent phenyl or pyridinyl, the phenyl or the pyridinyl each optionally being substituted by one or more of halogen; hydroxy; --COOR 12 ; trihalomethyl; alkoxy C1 to 6; alkyl C1 to 6; --NR 1 R 2 ; alkoxy C1 to 6 substituted by --NR 1 R 2 or by phenyl; or alkyl C1 to 6 substituted by --NR 1 R 2 or by --COOR 12 ; R 1 and R 2 , which may be the same or different, each independently represent hydrogen or alkyl C1 to 6, R 3 represents hydrogen, alkyl C1 to 6, alkanoyl C1 to 6, benzoyl, --COOR 8 , or --CONHR 11 , R 4 , R 5 , R 6 and R 7 , which may be the same or different each independently represent hydrogen, alkyl C1 to 6 or phenyl, R 8 represents alkyl C1 to 6 or aryl, R 11 represents alkyl C1 to 6 or aryl, R 12 represents hydrogen or alkyl C1 to 6, and pharmaceutically acceptable derivatives thereof. There are also described compositions containing the compounds and methods for their preparation. The compounds are indicated for use as pharmaceutical, eg antiinflammatory agents.

Preparation of 9-phenylethynyl-4-azafluoren-9-ol and 9-phenacylidene-4-azafluorene and their conversion to spiro compounds

Abstract: 9-Phenylethynyl-4-azafluoren-9-ol, which was obtained from 4-azafluorenone and phenylethynylmagnesium iodide, was used in syntheses of isomeric 9-phenacylidene-4-azafluorenes and spiro compounds with indene, indan, and pyrazoline fragments. It is assumed that the conversion of 9-phenacylidene derivatives to spiro compounds takes place via intramolecular substitution.

Preparation and properties of azinium salts of the 2-pyrazoline series

Abstract: Azinium salts containing pyrazoline fragments have been obtained by the reaction of 2-pyrazolines with aromatic and heteroaromatic aldehydes, acetylacetone, and acetoacetic ester in the presence of H2SnCl5 and HBF4. Reactions of nucleophilic addition to the multiple bonds and also some cycloaddition reactions among the arylidene derivative have been studied. From the azinium salts of a series of β-dicarbonyl compounds have been obtained previously unknown enamino carbonyl compounds of the 2-pyrazoline series.