Grafting and stabilization of metal complexes for increasing catalytic activity have remained an enormous challenge in the arena. However, designing a system with complementary properties including high surface area, loading, easy separation offers promising route efficient utilization magnetic material various applications. Herein, novel core–shell nanosphere catalyst (Fe3O4@C/KP23@MnCl2) was ...

Poly(4-vinylpyridine)-supported copper iodide nanoparticles is reported as a new, green and recyclable catalyst for the synthesis of aryl-14H-dibenzo [a-o] xanthenes under solvent-free conditions. This catalyst can be recovered by simple filtration and recycled up to 8 consecutive runs without any loss of their efficiency.

introduction: the treatment of cutaneous leishmaniasis (cl) is based primarily on the use of pentavalent antimonials, which may lead to many side effects limiting their use. photodynamic therapy (pdt) is an alternative for the treatment of cl, and some xanthene dyes have the potential for use in pdt. methods: the xanthenes rose bengal b (rb) and its derivatives rose bengal methyl ester (rbmet),...

a green and convenient méthode for the synthesis of  a variety of xanthene derivatives by condensation reaction between aldehydes and β-naphthol or dimedone in an micellar solution of sodium dodecylphosphonate is described. this method offers several advantages, such as using of a cheap and environmentally benign reaction media, low loadings of sodium dodecylphosphonate as catalyst and easy wor...

Artičoka (Cynara scolymus L.) je višegodišnja biljna vrsta koja zahvaljujući svojim prehrambenim ali i zdravstvenim značajkama postaje sve raširenija kultura na području primorske hrvatske otoka. Tijekom svog razvoja artičoka podložna napadu brojnih štetnika među kojima su gospodarski značajni nekoliko lisnih ušiju leptira. Lisne uši kao fiziološki štetnici sisanjem listova cvjetnih glavica pos...

The title mol-ecule, rac-6'-bromo-3'-di-ethyl-amino-3H-spiro-[2-benzo-furan-1,9'-xanthen]-3-one, C24H20BrNO3, was synthesized and the two enanti-omers which formed were separated. The structures of all three compounds were determined and compared with those of a variety of related derivatives. A notable feature is the fold of the xanthene portion which ranges from 15.15 (13)° in the racemate to...

Reduction of dixanthylidene with potassium or lithium resulted in formation of the antiaromatic dianion in high yield. Attempts to form the dianion by excited-state deprotonation of dixanthene with n-butyllithium/TMEDA resulted in formation of the tetraanion from deprotonation ortho to the oxygen. Orientation of the sp(3) hydrogens presumably allows preferential deprotonation of the xanthene ri...

The title compound, C(23)H(24)Cl(2)O(3), was synthesized by reaction of 2,4-dichloro-benzaldehyde and 5,5-dimethyl-cyclo-hexane-1,3-dione in ethyl-ene glycol. The central ring of the xanthene moiety is almost planar (with an r.m.s. deviation of 0.0268 Å from the least-squares plane) while the two outer rings, in a cis arrangement, display envelope conformations. The ring of the 2,4-dichloro-phe...

The asymmetric unit of the title xanthene compound, C(25)H(30)O(5), contains two mol-ecules in which the pyran ring and the dimeth-oxy-phenyl ring are nearly perpendicular to one another [dihedral angles = 86.81 (8) and 84.45 (9)°]. One of the meth-oxy groups in one mol-ecule is twisted away from the phenyl ring [C-O-C-C torsion angle = -103.40 (16)°]. The pyran ring adopts a boat conformation ...