Exclusive photodimerization reactions of chromone-2-carboxylic esters depending on reaction media.
Sakamoto, Masami; Yagishita, Fumitoshi; Kanehiro, Masayuki; Kasashima, Yoshio; Mino, Takashi; Fujita, Tsutomu; Organic letters 12 (2010) 4435–4437; doi:10.1021/ol101734k

data_1503196
_publ_section_title
;
 Exclusive photodimerization reactions of chromone-2-carboxylic esters
 depending on reaction media.
;
_journal_issue                   20
_journal_name_full               'Organic letters'
_journal_page_first              4435
_journal_page_last               4437
_journal_paper_doi               10.1021/ol101734k
_journal_volume                  12
_journal_year                    2010
_chemical_formula_sum            'C26 H24 O8'
_chemical_formula_weight         464.45
_space_group_IT_number           1
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  'P 1'
_symmetry_space_group_name_H-M   'P 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                69.1630(10)
_cell_angle_beta                 82.4060(10)
_cell_angle_gamma                82.3500(10)
_cell_formula_units_Z            1
_cell_length_a                   6.5748(7)
_cell_length_b                   8.8652(10)
_cell_length_c                   10.7627(12)
_cell_measurement_temperature    173
_cell_volume                     578.64(11)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      173
_diffrn_detector_area_resol_mean 8.333
_diffrn_measured_fraction_theta_full 0.983
_diffrn_measured_fraction_theta_max 0.885
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w 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  0.0073
_diffrn_reflns_av_sigmaI/netI    0.0379
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -4
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            3287
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         28.21
_diffrn_reflns_theta_min         2.03
_exptl_absorpt_coefficient_mu    0.099
_exptl_absorpt_correction_T_max  0.9901
_exptl_absorpt_correction_T_min  0.9614
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'SADABS Sheldrick 1996'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.333
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prismatic
_exptl_crystal_F_000             244
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.248
_refine_diff_density_min         -0.172
_refine_diff_density_rms         0.035
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.078
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     363
_refine_ls_number_reflns         2826
_refine_ls_number_restraints     199
_refine_ls_restrained_S_all      1.078
_refine_ls_R_factor_all          0.0422
_refine_ls_R_factor_gt           0.0355
_refine_ls_shift/su_max          0.099
_refine_ls_shift/su_mean         0.019
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0373P)^2^+0.1430P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0949
_refine_ls_wR_factor_ref         0.1000
_reflns_number_gt                2476
_reflns_number_total             2826
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol101734k_si_006.cif
_cod_data_source_block           p1
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      P1
_cod_database_code               1503196