Synthesis and stereochemistry of new tetraspiro-1,3-dioxanes
Opris, Dorina; Grosu, Ion; Toupet, Loïc; Plé, Gérard; Terec, Anamaria; Mager, Sorin; Muntean, Luminita; Journal of the Chemical Society, Perkin Transactions 1  (2001) 2413–; doi:10.1039/b104604g

data_7216914
_publ_section_title
;
 Synthesis and stereochemistry of new tetraspiro-1,3-dioxanes
;
_journal_issue                   19
_journal_name_full
'Journal of the Chemical Society, Perkin Transactions 1'
_journal_page_first              2413
_journal_paper_doi               10.1039/b104604g
_journal_year                    2001
_chemical_formula_sum            'C22 H36 O4'
_chemical_formula_weight         364.51
_chemical_name_systematic
;
?
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/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                 103.47(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   22.773(9)
_cell_length_b                   6.899(4)
_cell_length_c                   13.080(2)
_cell_measurement_temperature    293(2)
_cell_volume                     1998.5(14)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0078
_diffrn_reflns_av_sigmaI/netI    0.0418
_diffrn_reflns_limit_h_max       28
_diffrn_reflns_limit_h_min       -28
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            2277
_diffrn_reflns_theta_full        26.99
_diffrn_reflns_theta_max         26.99
_diffrn_reflns_theta_min         1.84
_exptl_absorpt_coefficient_mu    0.081
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.212
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             800
_exptl_crystal_size_max          0.42
_exptl_crystal_size_mid          0.32
_exptl_crystal_size_min          0.30
_refine_diff_density_max         0.327
_refine_diff_density_min         -0.319
_refine_diff_density_rms         0.046
_refine_ls_extinction_coef       0.0037(12)
_refine_ls_extinction_expression Fc^*^====kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.054
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     134
_refine_ls_number_reflns         2176
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.054
_refine_ls_R_factor_all          0.1564
_refine_ls_R_factor_gt           0.0741
_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^)+(0.0842P)^2^+3.2030P] where P====(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1915
_refine_ls_wR_factor_ref         0.2321
_reflns_number_gt                1142
_reflns_number_total             2176
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b104604g.txt
_cod_data_source_block           grocc
_cod_depositor_comments
;
The following automatic conversions were performed:
'_atom_site_symetry_multiplicity' tag replaced with
'_atom_site_symmetry_multiplicity'.

Automatic conversion script
Id: cif_correct_tags 1440 2010-10-19 06:21:57Z saulius 

The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/usr/data/users/saulius/automatic-downloads/retrospective/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 
;
_cod_original_cell_volume        1998.4(14)
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               7216914