First asymmetric synthesis of planar chiral [2.2]metacyclophanes
Marco Blangetti; Helge Muller-Bunz; Donal F. O'Shea; Chem.Commun. 49 (2013) 6125–; doi:10.1039/c3cc42275e

data_7109428
_publ_section_title
;
 First asymmetric synthesis of planar chiral [2.2]metacyclophanes
;
_journal_name_full               Chem.Commun.
_journal_page_first              6125
_journal_paper_doi               10.1039/c3cc42275e
_journal_volume                  49
_journal_year                    2013
_chemical_formula_moiety         'C18 H18 O3'
_chemical_formula_sum            'C18 H18 O3'
_chemical_formula_weight         282.32
_chemical_name_systematic
;
?
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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                 96.909(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   13.4948(2)
_cell_length_b                   14.0951(2)
_cell_length_c                   7.5300(1)
_cell_measurement_reflns_used    13681
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      76.1054
_cell_measurement_theta_min      3.1336
_cell_volume                     1421.88(4)
_computing_cell_refinement
;
CrysAlisPro, Agilent Technologies,
Version 1.171.34.49 (release 20-01-2011 CrysAlis171 .NET)
(compiled Jan 20 2011,15:58:25)
;
_computing_data_collection
;
CrysAlisPro, Agilent Technologies,
Version 1.171.34.49 (release 20-01-2011 CrysAlis171 .NET)
(compiled Jan 20 2011,15:58:25)
;
_computing_data_reduction
;
CrysAlisPro, Agilent Technologies,
Version 1.171.34.49 (release 20-01-2011 CrysAlis171 .NET)
(compiled Jan 20 2011,15:58:25)
;
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 10.3196
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'SuperNova, Dual, Cu at zero, Atlas'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_source         'SuperNova (Cu) X-ray Source'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0327
_diffrn_reflns_av_sigmaI/netI    0.0493
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            22791
_diffrn_reflns_theta_full        76.47
_diffrn_reflns_theta_max         76.47
_diffrn_reflns_theta_min         3.30
_exptl_absorpt_coefficient_mu    0.715
_exptl_absorpt_correction_T_max  0.975
_exptl_absorpt_correction_T_min  0.890
_exptl_absorpt_correction_type   analytical
_exptl_absorpt_process_details
;
CrysAlisPro, Agilent Technologies,
Version 1.171.34.49 (release 20-01-2011 CrysAlis171 .NET)
(compiled Jan 20 2011,15:58:25)
Analytical numeric absorption correction using a multifaceted crystal
model based on expressions derived by R.C. Clark & J.S. Reid.
(Clark, R. C. & Reid, J. S. (1995). Acta Cryst. A51, 887-897)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.319
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             600
_exptl_crystal_size_max          0.2158
_exptl_crystal_size_mid          0.1231
_exptl_crystal_size_min          0.0393
_refine_diff_density_max         0.253
_refine_diff_density_min         -0.223
_refine_diff_density_rms         0.052
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.002
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     194
_refine_ls_number_reflns         5465
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.002
_refine_ls_R_factor_all          0.0454
_refine_ls_R_factor_gt           0.0353
_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^)+(0.0556P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0955
_refine_ls_wR_factor_ref         0.0999
_reflns_number_gt                2787
_reflns_number_total             2970
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            c3cc42275e.txt
_cod_data_source_block           osh104
_cod_original_cell_volume        1421.88(3)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7109428