Über neue Reaktionen von Pyrrolderivaten zu blauen Pyrrolfarbstoffen

Abstract

Bei der Selbstzersetzung der Dipyrromethene 1-3 als Basen oder Salze entsteht ein neuer Typ labiler, blauer Farbstoffe deren Konstitution als 5'-(2-Pyrrolylvinyl)dipyrromethene 4 oder 5 auch durch Rontgenstrukturanalyse bewiesen wurde. Die Bildung dieser Farbstoffe la& sich nach neuartigen Reaktionsmechanismen erklaren, die auch zur Entstehung violetter sowie gruner Farbstoffe fuhren, die die schwarzen Pyrrolharze bilden konnten.

Use ofF-BODIPYs as a Protection Strategy for Dipyrrins: Optimization of BF2Removal

“…Compound 13 was synthesized from the corresponding dipyrrin·HBr salt using GP1 as a dark red solid (208 mg, 94% yield). Mp 208–210 °C; 1 H NMR (CDCl 3 , 500 MHz) δ 7.04 (s, 1H, meso -H), 6.04 (s, 2H), 2.53 (s, 6H), 2.24 (s, 6H).…”

15N NMR Chemical Shifts for the Identification of Dipyrrolic Structures

“…Zinc(II) Bis(3,3 ‘ ,5,5 ‘ -tetramethyldipyrromethene) (17). A solution of zinc acetate dihydrate (1.790 g, 7.9 mmol) and sodium acetate trihydrate (1.066 g, 7.9 mmol) in methanol (60 mL) was added to a solution of 3,3‘,5,5‘-tetramethyldipyrromethene hydrobromide (0.443 g, 1.6 mmol) in chloroform (60 mL). After the reaction mixture was stirred for 30 min, the solvent was removed by using a rotary evaporator and the crude mixture was dissolved in dichloromethane.…”

Synthesis, Anion‐Binding Properties, and In Vitro Anticancer Activity of Prodigiosin Analogues

“…If such a conclusion is correct, it leads to the suggestion that other chloride ion transport systems, including those that may have no direct structural resemblance to prodigiosins, may show interesting anticancer activity. prodigiosin analogues, [17] a cyclic prodigiosin derivative, [18] and a phenyl-substituted dipyrromethene derivative [3] were reported. While single-point binding of chloride ion is seen in the case of the latter system, the first two structures revealed binding modes that are analogous to those seen in the case of 4·HCl and 7·HCl, respectively.…”