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_1503191
_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            'C11 H8 O4'
_chemical_formula_weight         204.17
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_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                 102.864(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.1120(9)
_cell_length_b                   15.443(2)
_cell_length_c                   8.5355(11)
_cell_measurement_reflns_used    1437
_cell_measurement_temperature    173
_cell_measurement_theta_max      25.07
_cell_measurement_theta_min      2.64
_cell_volume                     913.9(2)
_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, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173
_diffrn_detector_area_resol_mean 8.333
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_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  0.0182
_diffrn_reflns_av_sigmaI/netI    0.0218
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            4287
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.08
_diffrn_reflns_theta_min         2.64
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.114
_exptl_absorpt_correction_T_max  0.9886
_exptl_absorpt_correction_T_min  0.9665
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'SADABS Sheldrick 1997'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.484
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prismatic
_exptl_crystal_F_000             424
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.246
_refine_diff_density_min         -0.227
_refine_diff_density_rms         0.045
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.005
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     137
_refine_ls_number_reflns         1629
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.005
_refine_ls_R_factor_all          0.0504
_refine_ls_R_factor_gt           0.0383
_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^)+(0.0645P)^2^+0.1759P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1018
_refine_ls_wR_factor_ref         0.1106
_reflns_number_gt                1284
_reflns_number_total             1629
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol101734k_si_001.cif
_cod_data_source_block           saka129_a_p21c
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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      P2(1)/c
_cod_database_code               1503191