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_4024298
_publ_section_title
;
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            'C17 H22 O4'
_chemical_formula_weight         290.35
_space_group_IT_number           43
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'F 2 -2d'
_symmetry_space_group_name_H-M   'F d d 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            16
_cell_length_a                   21.6856(12)
_cell_length_b                   39.832(2)
_cell_length_c                   6.9889(4)
_cell_measurement_temperature    180(2)
_cell_volume                     6036.8(6)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      180(2)
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.988
_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  0.0284
_diffrn_reflns_av_sigmaI/netI    0.0213
_diffrn_reflns_limit_h_max       30
_diffrn_reflns_limit_h_min       -30
_diffrn_reflns_limit_k_max       50
_diffrn_reflns_limit_k_min       -56
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            14559
_diffrn_reflns_theta_full        30.00
_diffrn_reflns_theta_max         30.00
_diffrn_reflns_theta_min         3.10
_exptl_absorpt_coefficient_mu    0.090
_exptl_absorpt_correction_T_max  0.9960
_exptl_absorpt_correction_T_min  0.9787
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'APEX II'
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.278
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Plate
_exptl_crystal_F_000             2496
_exptl_crystal_size_max          0.24
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.322
_refine_diff_density_min         -0.259
_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(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.458
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     190
_refine_ls_number_reflns         2339
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.457
_refine_ls_R_factor_all          0.0403
_refine_ls_R_factor_gt           0.0372
_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^)+(0.0357P)^2^+5.3712P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0975
_refine_ls_wR_factor_ref         0.1110
_reflns_number_gt                2249
_reflns_number_total             2339
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo802311w_si_007.cif
_cod_data_source_block           aw-4-108_0ma
_cod_original_sg_symbol_H-M      Fdd2
_cod_database_code               4024298