The <sup>1</sup>H NMR Spectroscopic Effect of Steric Compression Is Found in [3.3.1]Oxa- and Azabicycles and Their Analogues.
Zeng, Ziyu; Kociok-Köhn, Gabriele; Woodman, Timothy J.; Rowan, Michael G.; Blagbrough, Ian S.; ACS omega 6 (2021) 12769–12786; doi:10.1021/acsomega.1c01093

data_4518775
_publ_section_title
;
 The <sup>1</sup>H NMR Spectroscopic Effect of Steric Compression Is Found
 in [3.3.1]Oxa- and Azabicycles and Their Analogues.
;
_journal_issue                   19
_journal_name_full               'ACS omega'
_journal_page_first              12769
_journal_page_last               12786
_journal_paper_doi               10.1021/acsomega.1c01093
_journal_volume                  6
_journal_year                    2021
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C10 H18 O4'
_chemical_formula_sum            'C10 H18 O4'
_chemical_formula_weight         202.24
_space_group_crystal_system      monoclinic
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_atom_sites_solution_hydrogens   mixed
_audit_creation_method           SHELXL-2018/3
_cell_angle_alpha                90
_cell_angle_beta                 95.080(4)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   5.9795(2)
_cell_length_b                   10.4226(5)
_cell_length_c                   8.2748(3)
_cell_measurement_reflns_used    5209
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      72.9260
_cell_measurement_theta_min      5.3550
_cell_volume                     513.68(4)
_computing_cell_refinement       'CrysAlisPro 1.171.39.46 (Rigaku OD, 2018)'
_computing_data_collection       'CrysAlisPro 1.171.39.46 (Rigaku OD, 2018)'
_computing_data_reduction        'CrysAlisPro 1.171.39.46 (Rigaku OD, 2018)'
_computing_molecular_graphics
'ORTEP3 for Windows - Farrugia, L. J. J. Appl. Crystallogr. 1997, 30, 565'
_computing_publication_material
;
 'WinGX publication routines, Farrugia, 
 L. J., J. Appl. Crystallogr., 1999, 32, 837-838
;
_computing_structure_refinement
;
 SHELXL-2018/3 (Sheldrick, 2016)
 Sheldrick GM (2008) Acta Crystallogr A64:112--122 and 
 C. B. H\"ubschle, G. M. Sheldrick and B. Dittrich
 ShelXle: a Qt graphical user interface for SHELXL
 J. Appl. Cryst., 44, (2011) 1281-1284.
;
_computing_structure_solution
; 
 SHELXT
 Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
;
_diffrn_ambient_environment      N~2~
_diffrn_ambient_temperature      150.01(10)
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 8.1150
_diffrn_detector_type            EosS2
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'SuperNova, Dual, Cu at home/near, EosS2'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0342
_diffrn_reflns_av_unetI/netI     0.0259
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.998
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            7894
_diffrn_reflns_point_group_measured_fraction_full 0.971
_diffrn_reflns_point_group_measured_fraction_max 0.964
_diffrn_reflns_theta_full        67.684
_diffrn_reflns_theta_max         73.299
_diffrn_reflns_theta_min         5.367
_diffrn_source                   'micro-focus sealed X-ray tube'
_diffrn_source_type              'SuperNova (Cu) X-ray Source'
_exptl_absorpt_coefficient_mu    0.828
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.85223
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.39.46 (Rigaku Oxford Diffraction, 2018)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.308
_exptl_crystal_description       block
_exptl_crystal_F_000             220
_exptl_crystal_size_max          0.160
_exptl_crystal_size_mid          0.120
_exptl_crystal_size_min          0.080
_refine_diff_density_max         0.220
_refine_diff_density_min         -0.153
_refine_diff_density_rms         0.032
_refine_ls_abs_structure_details
;
 Flack x determined using 844 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.12(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.052
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     139
_refine_ls_number_reflns         1990
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.051
_refine_ls_R_factor_all          0.0306
_refine_ls_R_factor_gt           0.0297
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0459P)^2^+0.0406P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0764
_refine_ls_wR_factor_ref         0.0773
_reflns_Friedel_coverage         0.824
_reflns_Friedel_fraction_full    0.939
_reflns_Friedel_fraction_max     0.926
_reflns_number_gt                1937
_reflns_number_total             1990
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ao1c01093_si_006.cif
_cod_data_source_block           s18phar11
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               4518775
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_min   0.879
_shelx_estimated_absorpt_t_max   0.937
_oxdiff_exptl_absorpt_empirical_full_min 0.737
_oxdiff_exptl_absorpt_empirical_full_max 1.407
_oxdiff_exptl_absorpt_empirical_details
;
Empirical correction (ABSPACK) includes:
- Absorption correction using spherical harmonics
- Frame scaling
;
_shelx_res_checksum              33910
_shelx_hkl_checksum              96523