Probing Persistent Intramolecular C-H...X (X = O, S, Br, Cl, and F) Bonding in Solution Using Benzyl Meldrum's Acid Derivatives
Eric Fillion; Ashraf Wilsily; Dan Fishlock; Journal of Organic Chemistry 74 (2009) 1259–1267; doi:10.1021/jo802311w

data_4024305
_publ_section_title
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Probing Persistent Intramolecular C-H...X (X = O, S, Br, Cl, and F)
Bonding in Solution Using Benzyl Meldrum's Acid Derivatives
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_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              1259
_journal_page_last               1267
_journal_paper_doi               10.1021/jo802311w
_journal_volume                  74
_journal_year                    2009
_chemical_formula_sum            'C20 H26 O6'
_chemical_formula_weight         362.41
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 97.923(7)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.017(3)
_cell_length_b                   12.411(5)
_cell_length_c                   18.403(7)
_cell_measurement_temperature    180(2)
_cell_volume                     1813.6(11)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.967
_diffrn_measured_fraction_theta_max 0.967
_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  0.0354
_diffrn_reflns_av_sigmaI/netI    0.0428
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            13217
_diffrn_reflns_theta_full        28.00
_diffrn_reflns_theta_max         28.00
_diffrn_reflns_theta_min         2.94
_exptl_absorpt_coefficient_mu    0.097
_exptl_absorpt_correction_T_max  0.9961
_exptl_absorpt_correction_T_min  0.9733
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'APEX II'
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.327
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Plate
_exptl_crystal_F_000             776
_exptl_crystal_size_max          0.28
_exptl_crystal_size_mid          0.22
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.288
_refine_diff_density_min         -0.331
_refine_diff_density_rms         0.063
_refine_ls_extinction_coef       0.0032(6)
_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_ref   1.396
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     237
_refine_ls_number_reflns         4241
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.396
_refine_ls_R_factor_all          0.0806
_refine_ls_R_factor_gt           0.0556
_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^)+(0.0020P)^2^+0.9654P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1048
_refine_ls_wR_factor_ref         0.1257
_reflns_number_gt                3101
_reflns_number_total             4241
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo802311w_si_014.cif
_cod_data_source_block           aw-2-257c_0m
_cod_depositor_comments
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The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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_original_sg_symbol_H-M      P2_1/n
_cod_database_code               4024305