Results 141 to 150 of about 2,055 (188)

Iptycene-Derived Pyridazines and Phthalazines

The Journal of Organic Chemistry, 2007
The synthesis of new heterocyclic oligo(phenylene) analogues based on soluble, nonaggregating 1,2-diazines is reported. Improved palladium-catalyzed reductive coupling methods were developed to allow for the preparation of large quantities of iptycene-derived bipyridazines and biphthalazines, and the controlled synthesis of well-defined oligomers up to
Jean, Bouffard, Robert F, Eaton, Peter, Müller, Timothy M, Swager   +3 more
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Phosphorescence process in phthalazine

Spectrochimica Acta Part A: Molecular Spectroscopy, 1971
The phosphorescence and its polarization characteristics have been studied for phthalazine in EPA at 77°K. The phosphorescence spectrum consists of at least two progressions. One originating from the O-O band, which is relatively weak, is polarized out of the molecular plane; the other commences at 580 cm−1 from the O-O band and is polarized along the ...
H. Baba, I. Yamazaki, T. Takemura
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Reactions of C₆₀ with Pyridazine and Phthalazine

Chemistry – A European Journal, 2021
AbstractCage‐opened bisfulleroids are one of suitable building blocks for making a large hole on fullerenes. This work focuses on the Diels‐Alder reaction of C60 with azines, among synthetic methods developed thus far, to provide bisfulleroids. Surprisingly, the computational study predicted that the reaction proceeds with normal electron demand in ...
Yoshifumi Hashikawa, Hui Li, Yasujiro Murata   +2 more
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ChemInform Abstract: NEW PHTHALAZINE AND PYRIDAZINO(4,5‐G)PHTHALAZINE DERIVATIVES

Chemischer Informationsdienst, 1983
AbstractDie Reduktion des Benzoltetracarbonsäureesters (I) mit Natriumalanat bei ‐50°C liefert das Diformylderivat ( II), das mit Hydrazinhydrat zum Phthalazindicarbonsäureester (III) cyclisiert wird.
F. DE SIO, S. CHIMICHI, R. NESI, L. CECCHI   +3 more
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Pyridazines, Cinnolines, Benzocinnolines and Phthalazines

1964
Publisher Summary This chapter discusses the methods of synthesis, properties, spectroscopic analysis and typical reactions characteristic of pyridazines, cinnolines, benzocinnolines, phthalazines, and their derivatives. It describes the derivatives of pyridazines which include its alkyl and aryl derivatives, halogenopyridazines, nitropyridazines ...
John Parrick, C.J. Granville Shaw, Lina K. Mehta   +2 more
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Hydrazination of pyridazines and phthalazines

Journal of Heterocyclic Chemistry, 1983
AbstractIt is shown by15N‐labelling techniques that hydrazination of pyridazines partly occurs according to a reaction pathway, involving addition of the nucleophile (hydrazine), ring opening and ring closure (SN(ANRORC)‐mechanism). It is also proved that phthalazines undergo hydrazination without ring opening (SN(AE)‐mechanism).
A. Counotte‐Potman, H. C. Van Der Plas
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Laboratory assessment of environmental impact of phthalazine

Bulletin of Environmental Contamination and Toxicology, 1987
Several approaches to the environmental safety assessment of chemicals have been reported. The basic principles involved in predicting environmental behavior combine degradation kinetics and the partitioning/distribution of chemicals in the environment.
S S, Lande, M T, Elnabarawy, E A, Reiner, A N, Welter, R R, Robideau   +4 more
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Cinnolines and Phthalazines

2005
CHAPTER 1: PRIMARY SYNTHESES OF CINNOLINES. 1.1 From a Single Carbocyclic Substrate. 1.2 From a Carbocyclic Substrate and One Synthon. 1.3 From a Pyridazine Substrate. 1.4 From Other Heteromonocyclic Substrates. 1.5 From Heterobicyclic Substrates. 1.6 From Heteropolycyclic Substrates.
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Biotransformation of quinazoline and phthalazine by Aspergillus niger

Journal of Bioscience and Bioengineering, 2011
Cultures of Aspergillus niger NRRL-599 in fluid Sabouraud medium were grown with quinazoline and phthalazine for 7 days. Metabolites were purified by high-performance liquid chromatography and identified by mass spectrometry and proton nuclear magnetic resonance spectroscopy.
John B, Sutherland, Thomas M, Heinze, Laura K, Schnackenberg, James P, Freeman, Anna J, Williams   +4 more
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ChemInform Abstract: PHTHALAZINES PART 10, ON THE REACTION OF 1‐(METHYLSULFONYL)‐PHTHALAZINE WITH GRIGNARD REAGENTS

Chemischer Informationsdienst, 1974
AbstractBei Einwirkung von drei Äquivalenten der Grignard‐Verbindungen (IIa)‐(IId) auf das Phthalazin (I) entstehen die Addukte (IIIa)‐(IIId) und im Falle der Grignard‐ Verbindungen (IIa) und (IIb) auch noch die Substitutionsprodukte (IVa) und (IVb).
E. OISHI, K. OSUMI, E. HAYASHI
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