A novel iodine-mediated tandem cyclization-cycloaddition reaction leading to polyoxacyclic ring systems.
Xie, Yong-Xin; Yan, Ze-Yi; Qian, Bo; Deng, Wen-Ye; Wang, Dan-Zhu; Wu, Lu-Yong; Liu, Xue-Yuan; Liang, Yong-Min; Chemical communications (Cambridge, England) 34 (2009) 5451–5453; doi:10.1039/b910232a

data_7104716
_publ_section_title
;
 A novel iodine-mediated tandem cyclization-cycloaddition reaction
 leading to polyoxacyclic ring systems.
;
_journal_issue                   36
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              5451
_journal_page_last               5453
_journal_paper_doi               10.1039/b910232a
_journal_volume                  34
_journal_year                    2009
_chemical_formula_sum            'C20 H22 O6'
_chemical_formula_weight         358.38
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/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                 122.27(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   28.20(3)
_cell_length_b                   9.085(9)
_cell_length_c                   17.51(2)
_cell_measurement_reflns_used    4090
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      29.26
_cell_measurement_theta_min      2.34
_cell_volume                     3794(7)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_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      296(2)
_diffrn_measured_fraction_theta_full 0.987
_diffrn_measured_fraction_theta_max 0.987
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and 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  0.0776
_diffrn_reflns_av_sigmaI/netI    0.0922
_diffrn_reflns_limit_h_max       31
_diffrn_reflns_limit_h_min       -34
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            9004
_diffrn_reflns_theta_full        25.49
_diffrn_reflns_theta_max         25.49
_diffrn_reflns_theta_min         1.71
_exptl_absorpt_coefficient_mu    0.093
_exptl_absorpt_correction_T_max  0.9744
_exptl_absorpt_correction_T_min  0.9678
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.255
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1520
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.33
_exptl_crystal_size_min          0.28
_refine_diff_density_max         0.435
_refine_diff_density_min         -0.324
_refine_diff_density_rms         0.081
_refine_ls_extinction_coef       0.018(2)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.033
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     238
_refine_ls_number_reflns         3474
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.033
_refine_ls_R_factor_all          0.0941
_refine_ls_R_factor_gt           0.0700
_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^)+(0.1324P)^2^+3.0567P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1953
_refine_ls_wR_factor_ref         0.2178
_reflns_number_gt                2619
_reflns_number_total             3474
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b910232a.txt
_cod_data_source_block           c2c
_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 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               7104716