نتایج جستجو برای: dibenzo xanthenes
تعداد نتایج: 2380 فیلتر نتایج به سال:
In the title compound, C(21)H(18)O(3), the xanthene system and the meth-oxy-phenyl ring are practically orthogonal with a dihedral angle between their mean planes of 89.27 (3)°. The meth-oxy group attached to the phenyl ring makes a C-O-C-C torsion angle of 11.56 (18)°. In the crystal, mol-ecules are linked by C-H⋯O inter-actions into chains along [010]. Weak C-H⋯π inter-actions also occur.
The iron-catalyzed oxidative C–C homocoupling of diarylamines affords 2,2ʹ-bis(arylamino)-1,1ʹ-biaryls which represent crucial synthetic building blocks for an access to a range sevenmembered heterocyclic ring systems. Reaction with paraformaldehyde, diphenyl carbonate, and sulfite as efficient 1,1ʹ-dielectrophiles led dibenzo[d,f][1,3]diazepines, dibenzo[d,f][1,3]diazepinones, dibenzo[c,e][1,2...
Linear poly(p-phenylene)s are modestly active UV photocatalysts for hydrogen production in the presence of a sacrificial electron donor. Introduction of planarized fluorene, carbazole, dibenzo[b,d]thiophene or dibenzo[b,d]thiophene sulfone units greatly enhances the H2 evolution rate. The most active dibenzo[b,d]thiophene sulfone co-polymer has a UV photocatalytic activity that rivals TiO2, but...
In the title compound, C22H21N3O5, the β-lactam (azetidin-2-one) ring is nearly planar [maximum deviation = 0.010 (1) Å] and makes dihedral angles of 69.22 (5), 55.32 (5) and 89.42 (4)° with the least-squares planes formed by the four C atoms of the morpholine ring, which adopts a chair conformation, the benzene ring and the xanthene ring system, respectively. In the crystal, C-H⋯O hydrogen-bon...
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