3-<i>O</i>-Ethyl-<small>L</small>-ascorbic acid
Jin, Shu; Miao, Xiaoqin; Acta Crystallographica Section E 64 (2008) o860–; doi:10.1107/S1600536808009963

data_2218287
_publ_section_title
;
 3-<i>O</i>-Ethyl-<small>L</small>-ascorbic acid
;
_journal_coeditor_code           XU2411
_journal_issue                   5
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o860
_journal_paper_doi               10.1107/S1600536808009963
_journal_volume                  64
_journal_year                    2008
_chemical_formula_iupac          'C8 H12 O6'
_chemical_formula_moiety         'C8 H12 O6'
_chemical_formula_sum            'C8 H12 O6'
_chemical_formula_weight         204.18
_chemical_melting_point          385
_chemical_name_systematic
;
3-<i>O</i>-Ethyl-L-ascorbic 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'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   4.6690(9)
_cell_length_b                   11.939(2)
_cell_length_c                   16.794(3)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      13
_cell_measurement_theta_min      10
_cell_volume                     936.2(3)
_computing_cell_refinement       'CAD-4 Software (Enraf--Nonius, 1989)'
_computing_data_collection       'CAD-4 Software (Enraf--Nonius, 1989)'
_computing_data_reduction        'XCAD4 (Harms & Wocadlo, 1995)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2008)'
_computing_publication_material  'SHELXTL (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXTL (Sheldrick, 2008)'
_computing_structure_solution    'SHELXTL (Sheldrick, 2008)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Enraf--Nonius CAD-4'
_diffrn_measurement_method       '\w/2\q '
_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  0.0283
_diffrn_reflns_av_sigmaI/netI    0.0303
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            1973
_diffrn_reflns_theta_full        25.22
_diffrn_reflns_theta_max         25.22
_diffrn_reflns_theta_min         2.09
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 200
_diffrn_standards_interval_time  2h
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.126
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.449
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             432
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.183
_refine_diff_density_min         -0.259
_refine_ls_extinction_coef       0.121(14)
_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   1.004
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     137
_refine_ls_number_reflns         1024
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.003
_refine_ls_R_factor_all          0.0483
_refine_ls_R_factor_gt           0.0395
_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^)+(0.1P)^2^+1.3P] where P=(Fo^2^+2Fc^2^)/3
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1131
_refine_ls_wR_factor_ref         0.1376
_reflns_number_gt                882
_reflns_number_total             1024
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            xu2411.cif
_cod_data_source_block           I
_cod_database_code               2218287
_cod_database_fobs_code          2218287