Non-catalytic approach to the synthesis of partially reduced 'S' shaped dioxathia- and oxadithiahelicenes through base induced inter- and intramolecular C-C bond formation.
Maurya, Hardesh K.; Tandon, Vishnu K.; Kumar, Brijesh; Kumar, Abhinav; Huch, Volker; Ram, Vishnu Ji; Organic & biomolecular chemistry 10 (2012) 605–613; doi:10.1039/c1ob06091k

data_7152106
_publ_section_title
;
 Non-catalytic approach to the synthesis of partially reduced 'S' shaped
 dioxathia- and oxadithiahelicenes through base induced inter- and
 intramolecular C-C bond formation.
;
_journal_issue                   3
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              605
_journal_page_last               613
_journal_paper_doi               10.1039/c1ob06091k
_journal_volume                  10
_journal_year                    2012
_chemical_formula_sum            'C23 H17 N O2 S'
_chemical_formula_weight         371.44
_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                 95.26(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.723(2)
_cell_length_b                   9.374(4)
_cell_length_c                   24.947(7)
_cell_measurement_temperature    213(2)
_cell_volume                     1798.4(10)
_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      213(2)
_diffrn_measured_fraction_theta_full 0.973
_diffrn_measured_fraction_theta_max 0.973
_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           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0721
_diffrn_reflns_av_sigmaI/netI    0.0402
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       32
_diffrn_reflns_limit_l_min       -32
_diffrn_reflns_number            21353
_diffrn_reflns_theta_full        28.12
_diffrn_reflns_theta_max         28.12
_diffrn_reflns_theta_min         2.70
_exptl_absorpt_coefficient_mu    0.198
_exptl_absorpt_correction_T_max  0.9652
_exptl_absorpt_correction_T_min  0.8655
_exptl_absorpt_correction_type   none
_exptl_crystal_density_diffrn    1.372
_exptl_crystal_density_meas      0
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             776
_exptl_crystal_size_max          0.75
_exptl_crystal_size_mid          0.28
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.235
_refine_diff_density_min         -0.231
_refine_diff_density_rms         0.044
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.020
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     312
_refine_ls_number_reflns         4276
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.020
_refine_ls_R_factor_all          0.0520
_refine_ls_R_factor_gt           0.0391
_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^)+(0.0666P)^2^+0.1091P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1006
_refine_ls_wR_factor_ref         0.1074
_reflns_number_gt                3335
_reflns_number_total             4276
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c1ob06091k.txt
_cod_data_source_block           sh3000
_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 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        1798.5(10)
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               7152106