Results 151 to 160 of about 1,547 (180)

ChemInform Abstract: CHLORIERUNG VON PURPURIN, PURPURIN‐2‐METHYLAETHER UND CHINIZARIN

Chemischer Informationsdienst. Organische Chemie, 1970
AbstractDurch Chlorierung von Purpurin (I) mit überschüssigem Chlor in Eisessig bei Raumtemperatur wird die Tetrachlorverbindung (II) erhalten (56,6%).
M. V. SARGENT, D. O. N. SMITH, J. A. ELIX   +2 more
openaire   +1 more source

From purpurin-18 to new purpurin imide derivatives with functional groups

Journal of Porphyrins and Phthalocyanines
Chlorins are among the most interesting photosensitizers for photodynamic therapy because they exhibit a high quantum yield of the singlet oxygen generation and absorbance in the deep red. Indeed the penetration depth of light into skin increases with wavelength from the UV to the near-infrared light range.
Luce Janice Ndzimbou, Yves Champavier, Frédérique Brégier, Vincent Sol   +3 more
openaire   +1 more source

Synthesis of Monosubstituted Purpurins and Their Biological Activity

Chemistry of Natural Compounds, 2019
Products were obtained from acylation of 1,2,4-trihydroxy-9,10-anthraquinone (purpurin) by saturated cyclic carboxylic acid chlorides. The compositions and structures of the monosubstituted compounds were confirmed by elemental analysis and IR and PMR spectroscopy.
T. V. Kharlamova, R. B. Seidakhmetova, K. D. Praliev   +2 more
openaire   +1 more source

Purpurins and benzochlorins as sensitizers for photodynamic therapy

Journal of Photochemistry and Photobiology B: Biology, 1996
Purpurins and benzochlorins are hydrophobic second generation photosensitizers, which have sizable absorption in the 650-780 nm range and exhibit photodynamic activity against tumors after visible light treatment. This review summarizes the published data regarding these compounds: from the spectroscopic, photophysical and photochemical characteristics
openaire   +2 more sources

Revised Relative and Absolute Stereochemistry of (+)-Purpurin

Journal of Natural Products, 1998
The relative and absolute stereochemistries of (+)-purpurin (3), a flavanone natural product from Tephrosia, were determined to be 2S,7aR,10S,10aS by synthesis from semiglabrin in conjunction with X-ray crystallographic analysis.
, Pirrung, , Lee, , Morehead, , McPhail
openaire   +2 more sources

Purpurins: Improved Photosensitizers For Photodynamic Therapy

SPIE Proceedings, 1988
Two new groups of photosensitizers, purpurins and metallopurpurins were tested for photodynamic activity when combined with visible light (>590nm), in the treatment of transplantable urothelial tumors (FANFT induced) in Fischer 344 rats. In preliminary studies, animals were injected with 10 mg/kg body weight (b.w.) of the free base purpurins (NT1, NT2,
Alan R. Morgan, Martha Kreimer-Birnbaum, Greta M. Garbo, Rick W. Keck, Steven H. Selman   +4 more
openaire   +1 more source

Microbial glucosidation of 1,2,4-trihydroxy-9,10-anthraquinone (Purpurin)

Folia Microbiologica, 1984
Streptomyces aureofaciens glucosidizes 1,2,4-trihydroxy-9,10-anthraquinone (purpurin) added to the cultivation medium to yield the corresponding 2-beta-D-glucoside. The identity of the glucoside was demonstrated by comparing its physico-chemical properties with data of an authentic sample prepared synthetically.
N, Steinerová, J, Matĕjů, J, Cudlín, Z, Vanĕk   +3 more
openaire   +2 more sources

The chlorination of purpurin, purpurin-2-methyl ether, and quinizarin.

Tetrahedron Letters, 1970
M.V. Sargent, David O'N. Smith, J.A. Elix   +2 more
openaire   +1 more source

Zur Kenntnis der Purpurine. Über Purpurin 4

Justus Liebigs Annalen der Chemie, 1941
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Purpurin-carcinogenicity in rats

Food and Chemical Toxicology, 1996
openaire   +2 more sources