Cycloaddition of homochiral dihydroimidazoles: a 1,3-dipolar cycloaddition route to optically active pyrrolo[1,2-a]imidazoles.
Jones, Raymond C. F.; Howard, Kevin J.; Snaith, John S.; Blake, Alexander J.; Li, Wang-Shei; Steel, Peter J.; Organic & biomolecular chemistry 9 (2011) 297–306; doi:10.1039/c0ob00529k

data_7153084
_publ_section_title
;
 Cycloaddition of homochiral dihydroimidazoles: a 1,3-dipolar
 cycloaddition route to optically active pyrrolo[1,2-a]imidazoles.
;
_journal_issue                   1
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              297
_journal_page_last               306
_journal_paper_doi               10.1039/c0ob00529k
_journal_volume                  9
_journal_year                    2011
_chemical_formula_moiety         'C25 H28 N2 O4'
_chemical_formula_sum            'C25 H28 N2 O4'
_chemical_formula_weight         420.49
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 91.07(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.351(2)
_cell_length_b                   9.7612(10)
_cell_length_c                   19.942(3)
_cell_measurement_reflns_used    58
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      13
_cell_measurement_theta_min      11
_cell_volume                     2209.2(6)
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_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  0.0
_diffrn_reflns_av_sigmaI/netI    0.059
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            3081
_diffrn_reflns_theta_max         22.49
_diffrn_reflns_theta_min         1.79
_exptl_absorpt_coefficient_mu    0.086
_exptl_absorpt_correction_type   nine
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.264
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             896
_exptl_crystal_size_max          0.39
_exptl_crystal_size_mid          0.39
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.157
_refine_diff_density_min         -0.145
_refine_diff_density_rms         0.034
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   'not reliably determined'
_refine_ls_extinction_coef       0.0071(12)
_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_all   1.006
_refine_ls_goodness_of_fit_obs   1.059
_refine_ls_matrix_type           full
_refine_ls_number_parameters     548
_refine_ls_number_reflns         3072
_refine_ls_number_restraints     33
_refine_ls_restrained_S_all      1.169
_refine_ls_restrained_S_obs      1.049
_refine_ls_R_factor_all          0.0936
_refine_ls_R_factor_obs          0.0494
_refine_ls_shift/esd_max         0.017
_refine_ls_shift/esd_mean        0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.056P)^2^+0.456P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.141
_refine_ls_wR_factor_obs         0.100
_reflns_number_observed          2091
_reflns_number_total             3081
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            c0ob00529k.txt
_cod_data_source_block           jsphno
_cod_depositor_comments
;Adding full bibliography for 7153082--7153084.cif.

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.056P)^2^+0.456P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.056P)^2^+0.456P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        2209.1(5)
_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               7153084