Spirocyclic Tetramates by Sequential Knoevenagel and [1,5]-Prototropic Shift.
Josa-Culleré, Laia; Hirst, Michael G.; Lockett, Jonathan P.; Thompson, Amber L.; Moloney, Mark G.; The Journal of organic chemistry 84 (2019) 9671–9683; doi:10.1021/acs.joc.9b01345

data_4034418
_publ_section_title
;
 Spirocyclic Tetramates by Sequential Knoevenagel and [1,5]-Prototropic
 Shift.
;
_journal_issue                   15
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              9671
_journal_page_last               9683
_journal_paper_doi               10.1021/acs.joc.9b01345
_journal_volume                  84
_journal_year                    2019
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C23 H28 N2 O6'
_chemical_formula_sum            'C23 H28 N2 O6'
_chemical_formula_weight         428.48
_chemical_melting_point          ?
_space_group_IT_number           80
_space_group_name_Hall           'I 4bw'
_space_group_name_H-M_alt        'I 41'
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  'I 4bw'
_symmetry_space_group_name_H-M   'I 41'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     other
_audit_creation_date             2019-04-30
_audit_creation_method           'CRYSTALS_ver_14.61_build_7285 '
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   16.3993(2)
_cell_length_b                   16.3993(2)
_cell_length_c                   15.9819(3)
_cell_measurement_reflns_used    8034
_cell_measurement_temperature    150
_cell_measurement_theta_max      76.47
_cell_measurement_theta_min      3.77
_cell_volume                     4298.12(11)
_computing_cell_refinement
; 
 CrysAlisPro (Rigaku Oxford Diffraction, 2017) 
;
_computing_data_collection       'SuperNova, (Oxford Diffraction, 2010)'
_computing_data_reduction
; 
 CrysAlisPro (Rigaku Oxford Diffraction, 2017) 
;
_computing_molecular_graphics    'CAMERON (Watkin et al., 1996)'
_computing_publication_material  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_refinement  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_solution    'Superflip (Palatinus & Chapuis, 2007)'
_diffrn_ambient_temperature      150
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device       Area
_diffrn_measurement_device_type  'Oxford Diffraction SuperNova'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  'focussing mirrors'
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54180
_diffrn_reflns_av_R_equivalents  0.017
_diffrn_reflns_av_unetI/netI     0.023
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            13350
_diffrn_reflns_theta_full        74.837
_diffrn_reflns_theta_max         76.364
_diffrn_reflns_theta_min         3.812
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.792
_exptl_absorpt_correction_T_max  0.86
_exptl_absorpt_correction_T_min  0.79
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
; 
 CrysAlisPro (Rigaku Oxford Diffraction, 2017) 
;
_exptl_crystal_colour            clear_pale_colourless
_exptl_crystal_density_diffrn    1.324
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1823.990
_exptl_crystal_size_max          0.31
_exptl_crystal_size_mid          0.29
_exptl_crystal_size_min          0.19
_refine_diff_density_max         0.13
_refine_diff_density_min         -0.16
_refine_ls_abs_structure_details
; 
 Parsons, Flack & Wagner (2013), 
 1822 Friedel Pairs 
;
_refine_ls_abs_structure_Flack   -0.01(4)
_refine_ls_extinction_method     None
_refine_ls_goodness_of_fit_ref   1.0153
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     281
_refine_ls_number_reflns         4195
_refine_ls_number_restraints     1
_refine_ls_R_factor_all          0.0292
_refine_ls_R_factor_gt           0.0287
_refine_ls_shift/su_max          0.0003616
_refine_ls_shift/su_mean         0.0000383
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
;
 Method= Modified Sheldrick 
 w=1/[\s^2^(F^2^) + ( 0.05P)^2^ + 0.99P] 
 ,where P=(max(Fo^2^,0) + 2Fc^2^)/3 
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0806
_refine_ls_wR_factor_gt          0.0799
_refine_ls_wR_factor_ref         0.0806
_reflns_limit_h_max              14
_reflns_limit_h_min              -14
_reflns_limit_k_max              20
_reflns_limit_k_min              0
_reflns_limit_l_max              19
_reflns_limit_l_min              -19
_reflns_number_gt                4113
_reflns_number_total             4195
_reflns_threshold_expression     I>2.0\s(I)
_oxford_diffrn_Wilson_B_factor   3.47
_oxford_diffrn_Wilson_scale      0.05
_oxford_refine_ls_r_factor_ref   0.0292
_oxford_refine_ls_scale          3.72(4)
_oxford_reflns_number_all        4195
_oxford_structure_analysis_title 7130
_cod_data_source_file            jo9b01345_si_003.cif
_cod_data_source_block           8c
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_chemical_melting_point' value 'not measured' was changed
to '?' -- the value is undefined or not given.

data item '_exptl_crystal_density_meas' value 'not measured' was
changed to '?' -- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 6909 2019-04-08 15:41:33Z antanas 
;
_cod_original_cell_volume        4298.12(13)
_cod_original_sg_symbol_H-M      'I 41 '
_cod_database_code               4034418
_oxford_refine_reflns_threshold_expression_ref I>-3.0\s(I)
_oxford_hooft_y                  -0.01(4)
_oxford_bijvoet_difference       -0.01(4)
_oxford_refined_flack_x          0.01(13)