Chromium(0)-promoted [6pi + 2pi] cycloadditions of allenes with cycloheptatriene.
Rigby, James H.; Laurent, Stéphane B; Kamal, Zeeshan; Heeg, Mary Jane; Organic letters 10 (2008) 5609–5612; doi:10.1021/ol802401a

data_1504986
_publ_section_title
;
 Chromium(0)-promoted [6pi + 2pi] cycloadditions of allenes with
 cycloheptatriene.
;
_journal_issue                   24
_journal_name_full               'Organic letters'
_journal_page_first              5609
_journal_page_last               5612
_journal_paper_doi               10.1021/ol802401a
_journal_volume                  10
_journal_year                    2008
_chemical_formula_sum            'C24 H21 N O4'
_chemical_formula_weight         387.42
_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                 102.402(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   21.6415(15)
_cell_length_b                   7.7284(5)
_cell_length_c                   11.7898(8)
_cell_measurement_reflns_used    3750
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      25.9
_cell_measurement_theta_min      2.9
_cell_volume                     1925.9(2)
_computing_cell_refinement       'Bruker APEX2'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker APEX2'
_computing_molecular_graphics    SHELXTL-Plus
_computing_publication_material  SHELXL-97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_method       'Bruker APEX2'
_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  0.0785
_diffrn_reflns_av_sigmaI/netI    0.0643
_diffrn_reflns_limit_h_max       28
_diffrn_reflns_limit_h_min       -28
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            42496
_diffrn_reflns_theta_full        28.30
_diffrn_reflns_theta_max         28.40
_diffrn_reflns_theta_min         1.93
_exptl_absorpt_coefficient_mu    0.091
_exptl_absorpt_correction_T_max  0.9946
_exptl_absorpt_correction_T_min  0.9741
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS, Sheldrick, 1997'
_exptl_crystal_colour            'pale yellow'
_exptl_crystal_density_diffrn    1.336
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plates
_exptl_crystal_F_000             816
_exptl_crystal_size_max          0.29
_exptl_crystal_size_mid          0.17
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.271
_refine_diff_density_min         -0.226
_refine_diff_density_rms         0.050
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.948
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     262
_refine_ls_number_reflns         4793
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.948
_refine_ls_R_factor_all          0.0996
_refine_ls_R_factor_gt           0.0515
_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^)+(0.0742P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1156
_refine_ls_wR_factor_ref         0.1332
_reflns_number_gt                3034
_reflns_number_total             4793
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol802401a_si_002.cif
_cod_data_source_block           hste
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_absorpt_correction_type' value 'Multi-scan' changed to
'multi-scan' 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_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               1504986