Synthesis and structure of large difluoromethylene containing alicycles by ring closing metathesis (RCM).
Skibiński, Maciej; Urbina-Blanco, César A; Slawin, Alexandra M. Z.; Nolan, Steven P.; O'Hagan, David; Organic & biomolecular chemistry 11 (2013) 8209–8213; doi:10.1039/c3ob42062k

data_7153215
_publ_section_title
;
 Synthesis and structure of large difluoromethylene containing alicycles
 by ring closing metathesis (RCM).
;
_journal_issue                   47
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              8209
_journal_page_last               8213
_journal_paper_doi               10.1039/c3ob42062k
_journal_volume                  11
_journal_year                    2013
_chemical_formula_moiety         'C20 H34 S4'
_chemical_formula_sum            'C20 H34 S4'
_chemical_formula_weight         402.71
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_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            8
_cell_length_a                   18.522(4)
_cell_length_b                   11.470(3)
_cell_length_c                   20.220(5)
_cell_measurement_reflns_used    10061
_cell_measurement_temperature    93(2)
_cell_measurement_theta_max      28.7
_cell_measurement_theta_min      2.8
_cell_volume                     4295.7(18)
_computing_cell_refinement       'CrystalClear (Rigaku Corp., 2004)'
_computing_data_collection       'CrystalClear (Rigaku Corp., 2004)'
_computing_data_reduction        'CrystalClear (Rigaku Corp., 2004)'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      93(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  CCD
_diffrn_measurement_method       '\w and \f scans'
_diffrn_radiation_monochromator  confocal
_diffrn_radiation_source         'rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0922
_diffrn_reflns_av_sigmaI/netI    0.0865
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            25926
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.35
_diffrn_reflns_theta_min         2.83
_exptl_absorpt_coefficient_mu    0.443
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.777
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Jacobson, R. (1998) Private communication'
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.245
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Prism
_exptl_crystal_F_000             1744
_exptl_crystal_size_max          0.10
_exptl_crystal_size_mid          0.05
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.336
_refine_diff_density_min         -0.303
_refine_diff_density_rms         0.076
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.707
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     217
_refine_ls_number_reflns         3916
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.707
_refine_ls_R_factor_all          0.0781
_refine_ls_R_factor_gt           0.0467
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1306P)^2^+9.5556P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1307
_refine_ls_wR_factor_ref         0.1693
_reflns_number_gt                2818
_reflns_number_total             3916
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c3ob42062k.txt
_cod_data_source_block           8a
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_cell_volume        4295.5(17)
_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               7153215