Stereoselective Syntheses of the 2-Isopropenyl-2,3-dihydrobenzofuran Nucleus: Potential Chiral Building Blocks for the Syntheses of Tremetone, Hydroxytremetone, and Rotenone
Stephen C. Pelly; Sameshnee Govender; Manuel A. Fernandes; Hans-Günther Schmalz; Charles B. de Koning; Journal of Organic Chemistry 72 (2007) 2857–2864; doi:10.1021/jo062447h

data_4022796
_publ_section_title
;
 Stereoselective Syntheses of the 2-Isopropenyl-2,3-dihydrobenzofuran
 Nucleus: Potential Chiral Building Blocks for the Syntheses of
 Tremetone, Hydroxytremetone, and Rotenone
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              2857
_journal_page_last               2864
_journal_paper_doi               10.1021/jo062447h
_journal_volume                  72
_journal_year                    2007
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C14 H12 Cr O4'
_chemical_formula_sum            'C14 H12 Cr O4'
_chemical_formula_weight         296.24
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           96
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  'P 4nw 2abw'
_symmetry_space_group_name_H-M   'P 43 21 2'
_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            8
_cell_length_a                   8.33980(10)
_cell_length_b                   8.33980(10)
_cell_length_c                   37.0388(9)
_cell_measurement_reflns_used    5005
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      28.24
_cell_measurement_theta_min      2.50
_cell_volume                     2576.13(8)
_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    'Bruker SHELXTL'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_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  0.0366
_diffrn_reflns_av_sigmaI/netI    0.0238
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       48
_diffrn_reflns_limit_l_min       -48
_diffrn_reflns_number            18307
_diffrn_reflns_theta_full        27.99
_diffrn_reflns_theta_max         27.99
_diffrn_reflns_theta_min         2.20
_exptl_absorpt_coefficient_mu    0.894
_exptl_absorpt_correction_T_max  0.8674
_exptl_absorpt_correction_T_min  0.7655
_exptl_absorpt_correction_type   integration
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.528
_exptl_crystal_density_meas      0
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prismic
_exptl_crystal_F_000             1216
_exptl_crystal_size_max          0.36
_exptl_crystal_size_mid          0.34
_exptl_crystal_size_min          0.22
_refine_diff_density_max         0.208
_refine_diff_density_min         -0.507
_refine_diff_density_rms         0.054
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.01(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.089
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     173
_refine_ls_number_reflns         3100
_refine_ls_number_restraints     30
_refine_ls_restrained_S_all      1.115
_refine_ls_R_factor_all          0.0281
_refine_ls_R_factor_gt           0.0261
_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^)+(0.0327P)^2^+0.5799P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0657
_refine_ls_wR_factor_ref         0.0665
_reflns_number_gt                2925
_reflns_number_total             3100
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo062447hsi20061128_052625.cif
_cod_data_source_block           6m_sg1_0a
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Tetragonal' changed to 'tetragonal'
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 
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_cod_database_code               4022796