(–)-Metasantonic acid: alteration of the hydrogen-bonding mode in a diastereomer of santonic acid
Zinczuk, Juan; Ruveda, Edmundo A.; Lalancette, Roger A.; Thompson, Hugh W.; Acta Crystallographica Section E 63 (2007) o2370–o2372; doi:10.1107/S1600536807015309

data_2213457
_publ_section_title
;
 (--)-Metasantonic acid: alteration of the hydrogen-bonding mode in a
 diastereomer of santonic acid
;
_journal_coeditor_code           LH2356
_journal_issue                   5
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o2370
_journal_page_last               o2372
_journal_paper_doi               10.1107/S1600536807015309
_journal_volume                  63
_journal_year                    2007
_chemical_formula_iupac          'C15 H20 O4'
_chemical_formula_moiety         'C15 H20 O4'
_chemical_formula_sum            'C15 H20 O4'
_chemical_formula_weight         264.31
_chemical_melting_point          442
_chemical_name_common            '(-)metasantonic acid'
_chemical_name_systematic
;
(-)-(1R,3aS,4R,5S,7aS,9R)-octahydro-\a,3a,
5-trimethyl-6,8-dioxo-1,4-methano-1H-indene-1-acetic acid
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
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_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            4
_cell_length_a                   9.4191(2)
_cell_length_b                   11.7706(2)
_cell_length_c                   12.2382(2)
_cell_measurement_reflns_used    5501
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      65.02
_cell_measurement_theta_min      5.21
_cell_volume                     1356.83(4)
_computing_cell_refinement       APEX2
_computing_data_collection       'APEX2 (Bruker, 2006)'
_computing_data_reduction        'SAINT (Bruker, 2005)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2004)'
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.988
_diffrn_measurement_device_type  'Bruker SMART CCD APEXII area-detector'
_diffrn_measurement_method       '\f and \w'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
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_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            5501
_diffrn_reflns_theta_full        65.02
_diffrn_reflns_theta_max         65.02
_diffrn_reflns_theta_min         5.21
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.760
_exptl_absorpt_correction_T_max  0.871
_exptl_absorpt_correction_T_min  0.801
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 2001)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.294
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             568
_exptl_crystal_size_max          0.48
_exptl_crystal_size_mid          0.34
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.22
_refine_diff_density_min         -0.17
_refine_ls_abs_structure_details 'Flack (1983), 760 Friedel pairs'
_refine_ls_abs_structure_Flack   0.03(17)
_refine_ls_extinction_coef       0.0126(7)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL97
_refine_ls_goodness_of_fit_ref   1.07
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     179
_refine_ls_number_reflns         2087
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.07
_refine_ls_R_factor_all          0.027
_refine_ls_R_factor_gt           0.027
_refine_ls_shift/su_max          0.00
_refine_ls_shift/su_mean         0.00
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0366P)^2^+0.3873P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.070
_refine_ls_wR_factor_ref         0.070
_reflns_number_gt                2083
_reflns_number_total             2087
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            lh2356.cif
_cod_data_source_block           I
_cod_depositor_comments
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The following automatic conversions were performed:
'_geom_bond_publ_flag' value 'Y' changed to 'y' according to
'/home/saulius/struct/CIF-dictionaries/cif_core.dic' dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29 (2
times).

'_geom_angle_publ_flag' value 'Y' changed to 'y' according to
'/home/saulius/struct/CIF-dictionaries/cif_core.dic' dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29 (2 times).

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 

The following automatic conversions were performed:

'_geom_bond_publ_flag' value 'Y' changed to 'y' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29 (2
times).

'_geom_angle_publ_flag' value 'Y' changed to 'y' according
to /home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary
named 'cif_core.dic' version 2.4.1 from 2010-06-29 (2 times).

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_database_code               2213457
_cod_database_fobs_code          2213457