An iodine catalyzed metal free domino process for the stereoselective synthesis of oxygen bridged bicyclic ethers.
Reddy, B. V. Subba; Someswarao, B.; Prudhviraju, N.; Reddy, B. Jagan Mohan; Sridhar, B.; Kumar, S. Kiran; Organic & biomolecular chemistry 13 (2015) 6737–6741; doi:10.1039/c5ob00518c

data_7154489
_publ_section_title
;
 An iodine catalyzed metal free domino process for the stereoselective
 synthesis of oxygen bridged bicyclic ethers.
;
_journal_issue                   24
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              6737
_journal_page_last               6741
_journal_paper_doi               10.1039/c5ob00518c
_journal_volume                  13
_journal_year                    2015
_chemical_formula_sum            'C19 H20 O2'
_chemical_formula_weight         280.35
_space_group_crystal_system      orthorhombic
_space_group_IT_number           33
_space_group_name_Hall           'P 2c -2n'
_space_group_name_H-M_alt        'P n a 21'
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 21'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2015-02-10 deposited with the CCDC.
2015-05-11 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   8.6637(7)
_cell_length_b                   15.5478(12)
_cell_length_c                   11.0472(9)
_cell_measurement_reflns_used    3809
_cell_measurement_temperature    294(2)
_cell_measurement_theta_max      24.30
_cell_measurement_theta_min      2.26
_cell_volume                     1488.1(2)
_computing_cell_refinement       'SAINT (Bruker, 2001)'
_computing_data_collection       'SMART (Bruker, 2001)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    'SHELXTL/PC (Sheldrick, 1990)'
_computing_publication_material  SHELXL-2014/7
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2015)'
_computing_structure_solution    'SHELXS-2014/7 (Sheldrick, 2015)'
_diffrn_ambient_temperature      294(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device       'Bruker SMART APEX CCD area-detector'
_diffrn_measurement_device_type  'Bruker SMART APEX CCD area-detector'
_diffrn_measurement_method       '\w scan'
_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  0.0304
_diffrn_reflns_av_unetI/netI     0.0212
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            13621
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        25.000
_diffrn_reflns_theta_max         25.000
_diffrn_reflns_theta_min         2.262
_exptl_absorpt_coefficient_mu    0.080
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.251
_exptl_crystal_description       block
_exptl_crystal_F_000             600
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.159
_refine_diff_density_min         -0.148
_refine_diff_density_rms         0.032
_refine_ls_abs_structure_details
;
 Flack x determined using 1028 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.5(5)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.263
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     190
_refine_ls_number_reflns         2626
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.263
_refine_ls_R_factor_all          0.0509
_refine_ls_R_factor_gt           0.0489
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0414P)^2^+0.2675P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1088
_refine_ls_wR_factor_ref         0.1099
_reflns_Friedel_coverage         0.891
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     1.000
_reflns_number_gt                2542
_reflns_number_total             2626
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c5ob00518c2.cif
_cod_data_source_block           ay65
_cod_depositor_comments          'Adding full bibliography for 7154489.cif.'
_cod_database_code               7154489
_shelx_shelxl_version_number     2014/7
_shelx_res_checksum              8460