(<i>R</i>)-3,3'-Dibromo-2,2'-dimethoxy-5,5',6,6',7,7',8,8'-octahydro-1,1'-binaphthalene: a Brönsted acid for catalyzing asymmetric Morita–Baylis–Hillman reactions
He, Long; Ng, Seik Weng; Acta Crystallographica Section E 62 (2006) o5517–o5519; doi:10.1107/S1600536806046575

data_2211336
_publ_section_title
;(<i>R</i>)-3,3'-Dibromo-2,2'-dimethoxy-5,5',6,6',7,7',8,8'-octahydro-1,1'-binaphthalene:
 a Br\"onsted acid for catalyzing asymmetric Morita--Baylis--Hillman reactions
;
_journal_coeditor_code           CI2212
_journal_issue                   12
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o5517
_journal_page_last               o5519
_journal_paper_doi               10.1107/S1600536806046575
_journal_volume                  62
_journal_year                    2006
_chemical_formula_iupac          'C22 H24 Br2 O2'
_chemical_formula_moiety         'C22 H24 Br2 O2'
_chemical_formula_sum            'C22 H24 Br2 O2'
_chemical_formula_weight         480.23
_chemical_name_systematic
;
(R)-3,3'-Dibromo-2,2'-dimethoxy-5,5',6,6',7,7',8,8'-octahydro-
1,1'-binaphthalene
;
_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                   9.778(2)
_cell_length_b                   11.787(2)
_cell_length_c                   16.972(3)
_cell_measurement_reflns_used    2810
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      22.1
_cell_measurement_theta_min      2.1
_cell_volume                     1956.1(6)
_computing_cell_refinement       'SAINT (Bruker, 1999)'
_computing_data_collection       'SMART (Bruker, 1998)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    'X-SEED (Barbour, 2001)'
_computing_publication_material  SHELXL97
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.98
_diffrn_measured_fraction_theta_max 0.98
_diffrn_measurement_device_type  'Bruker SMART 1K area-detector'
_diffrn_measurement_method       '\f and \w'
_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  0.079
_diffrn_reflns_av_sigmaI/netI    0.099
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            10324
_diffrn_reflns_theta_full        26.2
_diffrn_reflns_theta_max         26.2
_diffrn_reflns_theta_min         2.1
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    4.158
_exptl_absorpt_correction_T_max  0.635
_exptl_absorpt_correction_T_min  0.422
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 1996)'
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.631
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             968
_exptl_crystal_size_max          0.26
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.12
_refine_diff_density_max         1.53
_refine_diff_density_min         -0.79
_refine_ls_abs_structure_details 'Flack (1983), 1368 Fridel pairs'
_refine_ls_abs_structure_Flack   0.00(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.02
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     247
_refine_ls_number_reflns         3842
_refine_ls_number_restraints     44
_refine_ls_restrained_S_all      1.02
_refine_ls_R_factor_all          0.113
_refine_ls_R_factor_gt           0.067
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1069P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.165
_refine_ls_wR_factor_ref         0.187
_reflns_number_gt                2505
_reflns_number_total             3842
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ci2212.cif
_cod_data_source_block           I
_cod_database_code               2211336
_cod_database_fobs_code          2211336