Scopariusicides, Novel Unsymmetrical Cyclobutanes: Structural Elucidation and Concise Synthesis by a Combination of Intermolecular [2 + 2] Cycloaddition and C-H Functionalization.
Zhou, Min; Li, Xing-Ren; Tang, Jian-Wei; Liu, Yang; Li, Xiao-Nian; Wu, Bin; Qin, Hong-Bo; Du, Xue; Li, Li-Mei; Wang, Wei-Guang; Pu, Jian-Xin; Sun, Han-Dong; Organic letters 17 (2015) 6062–6065; doi:10.1021/acs.orglett.5b03079

data_1555449
_publ_section_title
;
 Scopariusicides, Novel Unsymmetrical Cyclobutanes: Structural Elucidation
 and Concise Synthesis by a Combination of Intermolecular [2 + 2]
 Cycloaddition and C-H Functionalization.
;
_journal_issue                   24
_journal_name_full               'Organic letters'
_journal_page_first              6062
_journal_page_last               6065
_journal_paper_doi               10.1021/acs.orglett.5b03079
_journal_volume                  17
_journal_year                    2015
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C20 H30 O2'
_chemical_formula_sum            'C20 H30 O2'
_chemical_formula_weight         302.44
_space_group_IT_number           5
_space_group_name_Hall           'C 2y'
_space_group_name_H-M_alt        'C 1 2 1'
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'C 2y'
_symmetry_space_group_name_H-M   'C 1 2 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                 106.3990(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   20.0748(7)
_cell_length_b                   6.8584(3)
_cell_length_c                   25.9078(9)
_cell_measurement_reflns_used    9940
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      68.95
_cell_measurement_theta_min      3.56
_cell_volume                     3421.9(2)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.900
_diffrn_measured_fraction_theta_max 0.901
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0444
_diffrn_reflns_av_sigmaI/netI    0.0451
_diffrn_reflns_limit_h_max       23
_diffrn_reflns_limit_h_min       -23
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       31
_diffrn_reflns_limit_l_min       -30
_diffrn_reflns_number            14077
_diffrn_reflns_theta_full        69.50
_diffrn_reflns_theta_max         69.50
_diffrn_reflns_theta_min         1.78
_exptl_absorpt_coefficient_mu    0.567
_exptl_absorpt_correction_T_max  0.8902
_exptl_absorpt_correction_T_min  0.4528
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.174
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1328
_exptl_crystal_size_max          1.66
_exptl_crystal_size_mid          0.28
_exptl_crystal_size_min          0.21
_refine_diff_density_max         0.676
_refine_diff_density_min         -0.629
_refine_diff_density_rms         0.152
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.3(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.387
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     405
_refine_ls_number_reflns         4870
_refine_ls_number_restraints     7
_refine_ls_restrained_S_all      1.392
_refine_ls_R_factor_all          0.0948
_refine_ls_R_factor_gt           0.0936
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.2000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2628
_refine_ls_wR_factor_ref         0.2745
_reflns_number_gt                4761
_reflns_number_total             4870
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol5b03079_si_003.cif
_cod_data_source_block           cu_sc2121_0m
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_symmetry_cell_setting' value 'Monoclinic' was changed to
'monoclinic' in accordance with the
/home/saulius/struct/COD-crude-data/automatic-downloads/DataCite-retrospective/ACS/depositions/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 last updated on
2011-04-26.

Automatic conversion script
Id: cif_fix_values 6909 2019-04-08 15:41:33Z antanas 
;
_cod_original_sg_symbol_H-M      'C 2'
_cod_database_code               1555449