Microwave-assisted C-3 selective oxidative radical alkylation of flavones.
Mijangos, Marco V.; González-Marrero, Joaquin; Miranda, Luis D.; Vincent-Ruz, Paulette; Lujan-Montelongo, Armando; Olivera-Díaz, Diana; Bautista, Elhiu; Ortega, Alfredo; de la Luz Campos-González, María; Gamez-Montaño, Rocio; Organic & biomolecular chemistry 10 (2012) 2946–2949; doi:10.1039/c2ob25249j

data_7152299
_publ_section_title
;
 Microwave-assisted C-3 selective oxidative radical alkylation of
 flavones.
;
_journal_issue                   15
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              2946
_journal_page_last               2949
_journal_paper_doi               10.1039/c2ob25249j
_journal_volume                  10
_journal_year                    2012
_chemical_absolute_configuration unk
_chemical_formula_sum            'C20 H18 O5'
_chemical_formula_weight         338.34
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.2980(15)
_cell_length_b                   13.566(3)
_cell_length_c                   17.045(3)
_cell_measurement_reflns_used    1870
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      23.61
_cell_measurement_theta_min      2.39
_cell_volume                     1687.5(6)
_computing_cell_refinement       'SMART V 5.625 (Bruker, 1999)'
_computing_data_collection       'SMART V 5.625 (Bruker, 1999)'
_computing_data_reduction        'SAINT V 6.23A (Bruker, 1999)'
_computing_molecular_graphics    'SHELXTL V 6.12 (Sheldrick, 2000)'
_computing_publication_material  'SHELXTL V 6.12 (Sheldrick, 2000)'
_computing_structure_refinement  'SHELXTL V 6.12 (Sheldrick, 2000)'
_computing_structure_solution    'SHELXTL V 6.12 (Sheldrick, 2000)'
_diffrn_ambient_temperature      298(2)
_diffrn_detector_area_resol_mean 0.83
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker Smart APEX AXS CCD area detector'
_diffrn_measurement_method       'omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0799
_diffrn_reflns_av_sigmaI/netI    0.0693
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            14051
_diffrn_reflns_theta_full        25.40
_diffrn_reflns_theta_max         25.40
_diffrn_reflns_theta_min         1.92
_exptl_absorpt_coefficient_mu    0.096
_exptl_absorpt_correction_T_max  0.9924
_exptl_absorpt_correction_T_min  0.9719
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;

sadabs, Sheldrick, G. M. (1996). University of Gottingen, Germany.

;
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.332
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Prism
_exptl_crystal_F_000             712
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.09
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.132
_refine_diff_density_min         -0.127
_refine_diff_density_rms         0.031
_refine_ls_abs_structure_details
'Flack H D (1983), Acta Cryst. A39, 876-881, 1303 Friedel pairs merged'
_refine_ls_abs_structure_Flack   1.5(17)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.000
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     228
_refine_ls_number_reflns         3104
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.000
_refine_ls_R_factor_all          0.1069
_refine_ls_R_factor_gt           0.0510
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0438P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0969
_refine_ls_wR_factor_ref         0.1156
_reflns_number_gt                1812
_reflns_number_total             3104
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2ob25249j.txt
_cod_data_source_block           068mgl10
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_database_code               7152299
_solved_by                       'Simon Hernandez-Ortega'