Iminocyclopropa[l]phenanthrenes by the condensation of diarylaminoguanidines with 9,10-phenanthraquinone - a reinvestigation

1975 ◽  
Vol 28 (3) ◽  
pp. 681 ◽  
Author(s):  
B Halton ◽  
SAR Harrison ◽  
CW Spangler
Keyword(s):  
Independent Synthesis

Heating of the phenanthraquinone 4-aryl-3-(arylimino)semicarbazones (3a) and (3b) led to the phenanthraquinone 4-arylsemicarbazones (6a) and (6b). A statement in the literature that this reaction gives rise to 1-arylimino-1H-cyclopropa[l]phenanthrenes could not be confirmed. The constitution of (6a) was confirmed by independent synthesis from 4- phenylsemicarbazide and phenanthraquinone.

Sequence-Independent Synthesis of π-conjugated Arylenevinylene Oligomers using Bifunctional Thiophene Monomers

2012 ◽  
Vol 22 (7) ◽  
pp. 1489-1501 ◽  
Author(s):  
Kammasandra Nanjunda Shivananda ◽  
Irit Cohen ◽  
Elena Borzin ◽  
Yulia Gerchikov ◽  
Michal Firstenberg ◽  
...  
Keyword(s):  
Independent Synthesis

Recovery of Photosystem II Activity in PhotoinhibitedSynechocystisCells:  Light-Dependent Translation Activity Is Required besides Light-Independent Synthesis of the D1 Protein†

Biochemistry ◽  
2000 ◽  
Vol 39 (8) ◽  
pp. 2032-2041 ◽  
Author(s):  
Sabine Constant ◽  
Yael Eisenberg-Domovitch ◽  
Itzhak Ohad ◽  
Diana Kirilovsky
Keyword(s):  
Photosystem Ii ◽  
D1 Protein ◽  
Independent Synthesis ◽  
Photosystem Ii Activity

THE PYROLYSIS OF OXIMES OF SOME GAMMA CYANO-AND GAMMA NITRO-KETONES

1965 ◽  
Vol 43 (9) ◽  
pp. 2486-2492 ◽  
Author(s):  
C. F. H. Allen
Keyword(s):  
Heterocyclic Compounds ◽  
Beckmann Rearrangement ◽  
Complex Mixtures ◽  
Physical Methods ◽  
New Synthesis ◽  
Independent Synthesis

Oximes of gamma cyano- and gamma nitro-ketones are decomposed by heat as well as by acids. From the very complex mixtures resulting there have been isolated arylated pyrroles, arylated 2-aminopyridines, and the corresponding pyridones, as well as several minor products. This behavior constitutes a new synthesis of these heterocyclic compounds. In a Beckmann rearrangement γ-benzoyl-α,β-diphenylbutyronitrile gave an anilide, the structure of which was confirmed by an independent synthesis. By physical methods both structures of gamma ketonic amides are confirmed.

Hydroxamic acids. V. The alkylation of O-alkylarylhydroxamic acids

1974 ◽  
Vol 27 (6) ◽  
pp. 1341 ◽  
Author(s):  
PM Beart ◽  
AD Ward
Keyword(s):  
Spectral Data ◽  
Alkylating Agent ◽  
Alkylating Agents ◽  
Hydroxamic Acids ◽  
Aryl Ring ◽  
Independent Synthesis ◽  
Unambiguous Assignment

The reactions of O-alkylarylhydroxamic acids with a variety of alkylating agents, to yield mixtures of the N,O-dialkyl and 0,O'-dialkyl products, are described. Spectral data and independent synthesis allow the unambiguous assignment of structure to these isomeric products. Substituents on the aryl ring exert an electronic influence on the ratio of the two products; the extent of this influence varies with the alkylating agent. Diazomethane, triethyloxonium tetrafluoroborate and methyl fluorosulphonate give largely, but not exclusively, the 0,O'-dialkyl product. Methyl fluorosulphonate, in the presence of a base, reacts further to form an unstable salt which appears also to function as an alkylating agent.

2,5-Bis-(2-hydroxybenzoylamino)pentanoic acid, a salicylic acid-metabolite isolated from chicken: characterization and independent synthesis

2003 ◽  
Vol 13 (3) ◽  
pp. 335-337 ◽  
Author(s):  
Ulrik Hillaert ◽  
Kris Baert ◽  
Jef Rozenski ◽  
Siska Croubels ◽  
Denis De Keukeleire ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
Pentanoic Acid ◽  
Acid Metabolite ◽  
Independent Synthesis

A Technology Independent Synthesis Approach for Integrated mmWave Coupled Line Circuits

2020 ◽  
Author(s):  
Tim Maiwald ◽  
Albert-Marcel Schrotz ◽  
Katharina Kolb ◽  
Julian Potschka ◽  
Marco Dietz ◽  
...  
Keyword(s):  
Coupled Line ◽  
Independent Synthesis ◽  
Synthesis Approach

Synthesis of Novel 2-Alkoxy-5H-benzo[6,7]cyclohepta[1,2-b]pyridine-3-carbonitriles

2003 ◽  
Vol 58 (7) ◽  
pp. 698-703 ◽  
Author(s):  
Adel S. Girgis ◽  
I. S. Ahmed-Farag
Keyword(s):  
Single Crystal ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
X Ray ◽  
Independent Synthesis

Reaction of 6-arylmethylene-6,7,8,9-tetrahydro-5H-benzocyclo-hepten-5-ones (1) with malononitrile in the appropriate alcohol in the presence of sodium afforded the corresponding 2-alkoxy-4-aryl- 6,7-dihydro-5H-benzo[6,7]cyclohepta[1,2-b]pyridine-3-carbonitriles (2) and not their isomeric forms 2-alkoxy-4-aryl-6,7-dihydro-5H-benzo[3,4]-cyclohepta[1,2-c]pyridine-1-carbonitriles (3). The proposed structure was confirmed via independent synthesis of (2) through the reaction of 6,7,8,9- tetrahydro-5-benzocycloheptenone (4) with the appropriate ylidenemalononitriles 5 under the same reaction conditions. Single crystal X-ray diffraction proves the structures of 2a,b.

Synthesis of 2-substituted 5-arylidenethiazolin-4-ones from α,β-unsaturated acyl isothiocyanates

1981 ◽  
Vol 46 (2) ◽  
pp. 436-445 ◽  
Author(s):  
Peter Kutschy ◽  
Milan Dzurilla ◽  
Pavol Kristian ◽  
Kvetoslava Kutschyová
Keyword(s):  
Primary Amines ◽  
Reaction Conditions ◽  
H Nmr ◽  
Unsaturated Acyl ◽  
Independent Synthesis

α,β-Unsaturated acyl isothiocyanates react with N-methylaniline to give thioureas which, when treated with bromine in chloroform, afford benzothiazoline derivatives. Under the same reaction conditions primary amines, diethylamine, piperidine and morpholine furnish 2-substituted 5-arylidenethiazolin-4-ones. Their structure was corroborated by an independent synthesis and on the basis of spectral (IR, 1H-NMR and mass) evidence.

scholarly journals Aliphatic diazo compounds. IX. The base-induced dimerization of α-diazo ketones

1969 ◽  
Vol 47 (21) ◽  
pp. 3997-4004 ◽  
Author(s):  
Peter Yates ◽  
R. G. F. Giles ◽  
D. G. Farnum
Keyword(s):  
Benzoic Acid ◽  
Dimethyl Sulfoxide ◽  
Potassium Hydroxide ◽  
Ammonium Acetate ◽  
Butyl Alcohol ◽  
Diazo Compounds ◽  
Prolonged Treatment ◽  
Independent Synthesis

Treatment of 2-diazoacetophenone (1) with potassium t-butoxide in t-butyl alcohol gives a colorless dimer, which is shown to be 5-benzoyl-2-phenacyltetrazole (4) by its independent synthesis by phenacylation of 5-benzoyltetrazole. The latter reaction also gives 5-benzoyl-1-phenacyltetrazole (3), which is distinguished from 4 by its reduction to di(2-hydroxy-2-phenylethyl)amine and by its cyclization on treatment with ammonium acetate. The assignment of the structure of the colorless dimer of 1 permits the postulation of related pathways for its formation and that of the red-brown dimer obtained on treatment of 1 with potassium hydroxide in dimethyl sulfoxide. 2-Phenacyltetrazole (22) and benzoic acid are formed in addition to 4 on treatment of 1 with potassium t-butoxide in t-butyl alcohol; these are considered to arise via cleavage of 4, since prolonged treatment of 4 and 3 with potassium t-butoxide in t-butyl alcohol gives 22 and 1-phenacyltetrazole (24), respectively. Compounds 22 and 24 have been prepared independently by phenacylation of tetrazole.

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