Gassman's cationic [2 + 2] cycloadditions using temporary tethers.
Deng, Jun; Hsung, Richard P.; Ko, Changhong; Organic letters 14 (2012) 5562–5565; doi:10.1021/ol3026796

data_1508744
_publ_section_title
;
 Gassman's cationic [2 + 2] cycloadditions using temporary tethers.
;
_journal_issue                   21
_journal_name_full               'Organic letters'
_journal_page_first              5562
_journal_page_last               5565
_journal_paper_doi               10.1021/ol3026796
_journal_volume                  14
_journal_year                    2012
_chemical_formula_moiety         'C17 H28 N2 O6'
_chemical_formula_sum            'C17 H28 N2 O6'
_chemical_formula_weight         356.41
_chemical_name_common            12168a
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 93.013(1)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.0126(10)
_cell_length_b                   10.3020(13)
_cell_length_c                   21.980(3)
_cell_measurement_reflns_used    2973
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.46
_cell_measurement_theta_min      2.71
_cell_volume                     1811.8(4)
_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      173(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0454
_diffrn_reflns_av_sigmaI/netI    0.0350
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            21124
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         1.86
_exptl_absorpt_coefficient_mu    0.099
_exptl_absorpt_correction_T_max  0.9951
_exptl_absorpt_correction_T_min  0.9805
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2008/1)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.307
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Plate
_exptl_crystal_F_000             768
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.11
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.396
_refine_diff_density_min         -0.271
_refine_diff_density_rms         0.043
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.032
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     230
_refine_ls_number_reflns         4148
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.032
_refine_ls_R_factor_all          0.0740
_refine_ls_R_factor_gt           0.0450
_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^)+(0.0536P)^2^+0.4295P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1053
_refine_ls_wR_factor_ref         0.1213
_reflns_number_gt                2818
_reflns_number_total             4148
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol3026796_si_004.cif
_cod_data_source_block           12168a
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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_sg_symbol_H-M      P2(1)/n
_cod_database_code               1508744