Results 221 to 230 of about 85,504 (285)
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Current Medicinal Chemistry, 1996
Abstract: There are three major classes of photosensitizers which can initiate a phototoxic effect to tissues upon irradiation. These are the cationic dyes (Type I Photosensitizer), the psoralens (Type I and II Photosensitizer), and cyclic polypyrrolic compounds (Type II Photosensitizer).
E. Sternberg, D. Dolphin
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Abstract: There are three major classes of photosensitizers which can initiate a phototoxic effect to tissues upon irradiation. These are the cationic dyes (Type I Photosensitizer), the psoralens (Type I and II Photosensitizer), and cyclic polypyrrolic compounds (Type II Photosensitizer).
E. Sternberg, D. Dolphin
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Pentapyrrolic Calix[4]pyrrole.
ChemInform, 2003AbstractFor Abstract see ChemInform Abstract in Full Text.
Warriner, Colin N. +3 more
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Chemistry – An Asian Journal, 2015
AbstractThe dearomatization of heterocycles has been a powerful means for producing functional molecules in synthesis. In the case of pyrroles, reductive methods (such as the Birch reduction) have been most widely exploited, while oxidative methods are generally dismissed as too difficult or unpredictable to be useful.
James K, Howard +3 more
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AbstractThe dearomatization of heterocycles has been a powerful means for producing functional molecules in synthesis. In the case of pyrroles, reductive methods (such as the Birch reduction) have been most widely exploited, while oxidative methods are generally dismissed as too difficult or unpredictable to be useful.
James K, Howard +3 more
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The Synthesis of 3-Substituted Pyrroles from Pyrrole
Synthesis, 1985La reaction d'electrophiles avec le pyrrole se fait preferentiellement en position 1 ou 2; pour obtenir des derives substitues en 3, on protege d'abord la position 1 ou 2 par des substituants orientant la reaction en position 3 ou on utilise en position 2 des substituants permettant un rearrangement conduisant aux pyrroles substituees en 3; une etape ...
Hugh J. Anderson, Charles E. Loader
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2022
Pyrroles are prominent heterocycles with a central role in life processes. Two important natural pigments, haem and chlorophyll, contain a porphyrin core that contains four modified pyrrole subunits. This chapter discusses the uses and industrial synthesis of pyrroles.
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Pyrroles are prominent heterocycles with a central role in life processes. Two important natural pigments, haem and chlorophyll, contain a porphyrin core that contains four modified pyrrole subunits. This chapter discusses the uses and industrial synthesis of pyrroles.
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2001
The invention relates to novel pyrrole derivatives, to a number of methods for the production thereof, and to their use for controlling harmful organisms. The invention also relates to novel intermediate products and to the use thereof for producing pyrrole derivatives.
BAYER AG +10 more
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The invention relates to novel pyrrole derivatives, to a number of methods for the production thereof, and to their use for controlling harmful organisms. The invention also relates to novel intermediate products and to the use thereof for producing pyrrole derivatives.
BAYER AG +10 more
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Synthesis of pyrrole and substituted pyrroles (Review)
2017Pyrrole is widely known as a biologically active scaffold which possesses a diverse nature of activities. The combination of different pharmacophores in a pyrrole ring system has led to the formation of more active compounds. Pyrrole containing analogs are considered as a potential source of biologically active compounds that contains a significant set
Tzankova D. +3 more
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2009
Part 1 presents studies aimed at the synthesis of novel aromatic tetra- and pentapyrrolic pigments with meso-phenyl substituents and with long wavelengths of absorption. Such compounds are potential photosensitizers for use in photodynamic therapy (PDT). Several approaches are described: 1.
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Part 1 presents studies aimed at the synthesis of novel aromatic tetra- and pentapyrrolic pigments with meso-phenyl substituents and with long wavelengths of absorption. Such compounds are potential photosensitizers for use in photodynamic therapy (PDT). Several approaches are described: 1.
openaire +1 more source