Photorearrangement of dihetarylethenes as a tool for the benzannulation of heterocycles

2019 ◽  
Vol 17 (20) ◽  
pp. 4990-5000 ◽  
Author(s):  
Andrey G. Lvov ◽  
Alexey M. Kavun ◽  
Vadim V. Kachala ◽  
Konstantin A. Lyssenko ◽  
Valerii Z. Shirinian
Keyword(s):  
Benzene Ring ◽  
Wide Scope ◽  
Photochemical Rearrangement

The photochemical rearrangement of dihetarylethenes is a powerful tool for the benzannulation of heterocycles, providing a wide scope of benzannulated heterocycles and N-, S-, C-, and O-substituents in the newly formed benzene ring.

Electron Microscopic and Isozyme Study of a Case of Ochronosis

1972 ◽  
Vol 30 ◽  
pp. 88-89
Author(s):  
Jay W. Cha ◽  
Perry J. Melnick
Keyword(s):  
Benzene Ring ◽  
Enzyme System ◽  
Homogentisic Acid ◽  
Degenerative Changes ◽  
Acid Oxidase ◽  
Electron Microscopic ◽  
Tyrosine Metabolism ◽  
Collagenous Tissues

Hereditary ochronosis in very few cases has been examined electron microscopically or histochemically. In this disease homogentisic acid, a normal intermediary of tyrosine metabolism, forms in excessive amounts. This is believed to be due to absence or defective activity of homogentisic acid oxidase, an enzyme system necessary to break the benzene ring and to further break it down to fumaric and acetoacetic acids. Ochronotic pigment, a polymerized form of homogentisic acid, deposits mainly in mesenchymal tissues. There has been a question whether the pigment originates from the collagenous tissues, or deposits passively, where in contrast to melanin it induces degenerative changes.

Amâlî (Imla) As Arabic Writing Technique

Metahumaniora ◽  
2017 ◽  
Vol 7 (1) ◽  
pp. 128
Author(s):  
Dicky Rachmat Pauji
Keyword(s):  
Middle East ◽  
Teaching And Learning ◽  
Arabic Language ◽  
Wide Scope ◽  
Writing Style ◽  
Learning Space ◽  
Islamic School ◽  
Related Literature ◽  
Language And Literature ◽  
The Subject

Amâlî (Imla) is a methodology used in studying Arabic language and literature that has a very wide scope. Amâlî (Imla) itself can be translated as: to dictate, to add, to fill in and etc. Amâlî (Imla) may also be interpreted further by the following narration: A teacher (ustadz) comes to a place like a mosque, an Islamic school or any learning space in general. In the process of teaching and learning, all that are spoken by the teacher is written down by the students on pieces of paper they had prepared earlier then be compiled into a book which will be preserved. This paper presents a brief summary of Amâlî (Imla) as a methodology which is discussed in many Amâlî (Imla) related literature works written from the beginning of 7th century until the 14th century. The subject Amâlî (Imla) is written in exceedingly diverse manner, unique to each of numerous known authors. This paper also discusses about various meaning of the word Amâlî (Imla) that has been interpreted differently among authors. In addition, the method of separating chapters and other minor distinct writing style that each of various groups of Amâlî (Imla) authors had developed was presented in this work. And lastly, this paper discusses the fact that Amâlî (Imla) related textbook authors were not only originated from the Middle East, but also from regions such as Iran (Huzistan) and Andalusia

Pharmacologically potentials of different substituted coumarin derivatives

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Benzene Ring ◽  
Bioactive Compounds ◽  
Biological Activities ◽  
Pharmacological Properties ◽  
Coumarin Derivatives ◽  
Wide Range ◽  
Anti Oxidant ◽  
Anti Inflammatory ◽  
Coumarin Compounds

Coumarin and its derivatives are widely spread in nature. Coumarin goes to agroup as benzopyrones, which consists of a benzene ring connected to a pyronemoiety. Coumarins displayed a broad range of pharmacologically useful profile.Coumarins are considered as a promising group of bioactive compounds thatexhibited a wide range of biological activities like anti-microbial, anti-viral,antiparasitic, anti-helmintic, analgesic, anti-inflammatory, anti-diabetic, anticancer,anti-oxidant, anti-proliferative, anti-convulsant, and antihypertensiveactivities etc. The coumarin compounds have immense interest due to theirdiverse pharmacological properties. In particular, these biological activities makecoumarin compounds more attractive and testing as novel therapeuticcompounds.

Globalization’s Vulnerabilities and the Response of Islamic Economics

2000 ◽  
Vol 17 (3) ◽  
pp. 70-94
Author(s):  
Tahir Beg
Keyword(s):  
Global Governance ◽  
National Policy ◽  
Economic Institutions ◽  
Wide Scope ◽  
Global Capital ◽  
Theoretical Premise ◽  
Islamic Economic

The philosophical-theoretical premise of globalization is ignorant of thevalues of justice, equity, and oneness of humanity, hence it leads to verticalintegration of humanity, systemic vacuum in global governance,drastic erosion in national policy autonomy, and accountability-freeempowerment of global capital. The Islamic worldview provides analternative paradigm for globalization and offers wide scope for refprmof contemporary globalization by re-exploring the interrelationshipbetween the concepts ‘Ummah’ and ‘one humanity.’ This suggests thatoperational re-orientation of Islamic economic institutions is greatlyneeded to protect the Ummah and humanity against the vulnerabilitiesof contemporary globalization

KONTEKS IBADAH MENURUT AL-QURAN

2018 ◽  
Vol 4 (2) ◽  
Author(s):  
Abdul Kallang
Keyword(s):  
Broad Sense ◽  
Wide Scope

AbstractWorship to God in the broad sense, also has a wide scope. Some are directly or indirectly. Directly is by way of worship hablun minallah. Indirectly is by fostering hablun minannas according to the command of God. The doctrine of worship should not be superficially understood, in which some interpret the worship to be merely a mahdhah worship, or only concerning ritual aspects such as prayer, fasting, and hajj. In fact, worship in the broad sense must also be understood, namely everything that is pleasing and favored by God in the form of deeds and speech is included worship. Keywords: Worship, Al-Quran, hablun minallah, hablun minannas

Hosoya polynomials of general spiro hexagonal chains

Filomat ◽  
2014 ◽  
Vol 28 (1) ◽  
pp. 211-215 ◽  
Author(s):  
Xianyong Li ◽  
Xiaofan Yang ◽  
Guoping Wang ◽  
Rongwei Hu
Keyword(s):  
Organic Chemistry ◽  
Benzene Ring ◽  
Spiro Compounds

Spiro hexagonal chains are a subclass of spiro compounds which are an important subclass of Cycloalkynes in Organic Chemistry. This paper addresses general spiro hexagonal chains in which every hexagon represents a benzene ring, and establishes the formulae for computing the Hosoya polynomials of general spiro hexagonal chains.

Proximity and conformation effects in 29Si and 13C NMR spectra of di-ortho substituted trimethylsiloxybenzenes

1990 ◽  
Vol 55 (8) ◽  
pp. 2027-2032 ◽  
Author(s):  
Jan Schraml ◽  
Robert Brežný ◽  
Jan Čermák
Keyword(s):  
Benzene Ring ◽  
13C Nmr ◽  
Proximity Effect ◽  
Nmr Spectra ◽  
Methoxy Group ◽  
Chemical Shifts ◽  
Proximity Effects ◽  
13C Nmr Spectra ◽  
Methoxy Groups ◽  
C Nmr

29Si and 13C NMR spectra of five 4-substituted 2,6-dimethoxytrimethylsiloxybenzenes were studied with the aim to elucidate the nature of the deshielding proximity effects observed in the spectra of ortho substituted trimethylsiloxybenzenes. The sensitivity of 29Si chemical shifts to para substitution is in the studied compounds essentially the same as in mono ortho methoxytrimethylsiloxybenzenes. The deshielding proximity effect of the ìsecondî methoxy group is somewhat smaller than that of the ìfirstî group. The present results indicate that the two methoxy groups assume coplanar conformations with the benzene ring and are turned away from the trimethylsiloxy group which is not in the benzene plane. It is argued that in mono ortho methoxytrimethylsiloxybenzenes the two substituent groups adopt the same conformations as in the compounds studied here.

The Myth of Structural Rationality

2017 ◽  
Author(s):  
Benjamin Kiesewetter
Keyword(s):  
Wide Scope ◽  
Structural Requirements ◽  
Rational Requirements ◽  
Narrow Scope ◽  
Scope Interpretation

While Chapters 4 and 5 suggest that structural requirements of rationality cannot be normative, Chapter 6 argues for the stronger conclusion that there are no such requirements to begin with. The argument is that both narrow- and wide-scope interpretations of structural requirements face problems independently of whether these requirements are understood as being normative. Starting with the narrow-scope interpretation, the chapter discusses the problem that it licenses bootstrapping of rational requirements (6.1), that it entails inconsistent requirements (6.2), and that it entails requirements that undermine each other in a counterintuitive way (6.3). Turning to the wide-scope interpretation, the chapter discusses the charge that wide-scope requirements cannot capture an important asymmetry involved in structural irrationality (6.4–6.5), and that they are incapable of guiding our responses (6.6). It is argued that all of these objections pose serious problems for the respective accounts. This supports the conclusion that there are no structural requirements of rationality (6.7).

Parentheticalism and Requirements of Rationality

2018 ◽  
Author(s):  
Tim Henning
Keyword(s):  
Point Of View ◽  
Normative Reasons ◽  
Wide Scope ◽  
Structural Requirements

It is suggested that parentheticalism obviates the need to think of rationality as a distinct normative category, different from the category of support by normative reasons. So-called structural requirements are discussed as a potential obstacle to this proposal. It is shown that a parentheticalist account of the antecedents of rationality conditionals can explain away the impression that there are structural requirements of rationality. This account also solves the bootstrapping problem without introducing wide-scope oughts or the like. A notion of pseudo-detachment is introduced to describe the inferential behavior of the relevant conditionals. It is also explained how parentheticalism can capture the elusive idea of taking the subject’s point of view.

XXI.—The Synthesis of Some Methyl- and Dimethylfluoranthenes

1972 ◽  
Vol 69 (4) ◽  
pp. 281-286
Author(s):  
H. F. Andrew ◽  
Neil Campbell ◽  
E. M. Swan ◽  
N. H. Wilson
Keyword(s):  
Benzene Ring ◽  
Propionic Acid ◽  
Hydrofluoric Acid ◽  
Phenyl Ring ◽  
Ring Closure ◽  
Methyl Group ◽  
Image Position

3-Methylfluorene-9-propionic acid (1) with hydrofluoric acid undergoes ring-closure on the substituted ring to give 1,2,3,10b-tetrahydro-5-methylfluoranthen-3-one (II).Wolff-Kishner reduction of the ketone yielded l,2,3,10b-tetrahydro-5-methylfluoranthene which on dehydrogenation gave 2-methylfluoranthene (III, R=H) identical with a sample prepared according to the method of Tucker (1952) and differing from 8-methylfluoranthene. This proved that ring-closure of (I) had occurred as expected on the methyl-bearing benzene ring. In this instance ring-closure occurs in the position meta to the methyl group and is reminiscent of the similar ring-closure of 2-phenyl-2-p-tolylpropionic acid to give 6-methyl-3-phenylindanone (Pfeiffer and Roos 1941). It thus provided a further example of the limitations of von Braun's statement that Friedel-Crafts ring-closure occurs much less readily at the position meta to a methyl group than on a phenyl ring (von Braun, Manz and Reinsch 1928).

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