Conformational preferences of oxy-substituents in butenolide-tetrahydropyran spiroacetals and butenolide-piperidine spiro-N,O-acetals.
Naud, Sébastien; Macnaughton, Sarah J.; Dyson, Bryony S.; Woollaston, Daniel J.; Dallimore, Jonathan W. P.; Robertson, Jeremy; Organic & biomolecular chemistry 10 (2012) 3506–3518; doi:10.1039/c2ob06849d

data_7152304
_publ_section_title
;
 Conformational preferences of oxy-substituents in
 butenolide-tetrahydropyran spiroacetals and butenolide-piperidine
 spiro-N,O-acetals.
;
_journal_issue                   17
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              3506
_journal_page_last               3518
_journal_paper_doi               10.1039/c2ob06849d
_journal_volume                  10
_journal_year                    2012
_chemical_formula_moiety         'C8 H10 O4'
_chemical_formula_sum            'C8 H10 O4'
_chemical_formula_weight         170.16
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   7.0008(2)
_cell_length_b                   9.0561(2)
_cell_length_c                   24.0388(5)
_cell_measurement_reflns_used    1982
_cell_measurement_temperature    150
_cell_measurement_theta_max      27
_cell_measurement_theta_min      5
_cell_volume                     1524.06(6)
_computing_cell_refinement       'DENZO/SCALEPACK (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Nonius, 1997-2001).'
_computing_data_reduction        'DENZO/SCALEPACK (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'CAMERON (Watkin et al., 1996)'
_computing_publication_material  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_refinement  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_solution    'SIR92 (Altomare et al., 1994)'
_diffrn_ambient_temperature      150
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.024
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
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_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       31
_diffrn_reflns_limit_l_min       -30
_diffrn_reflns_number            3461
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_diffrn_reflns_theta_max         27.454
_diffrn_reflns_theta_min         5.172
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.120
_exptl_absorpt_correction_T_max  0.98
_exptl_absorpt_correction_T_min  0.98
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'DENZO/SCALEPACK (Otwinowski & Minor, 1997)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.483
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             720
_exptl_crystal_size_max          0.24
_exptl_crystal_size_mid          0.20
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_refine_ls_extinction_method     None
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_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     109
_refine_ls_number_reflns         1723
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_refine_ls_R_factor_gt           0.0363
_refine_ls_shift/su_max          0.000360
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
;
Method= Modified Sheldrick
w=1/[\s^2^(F^2^) + ( 0.06P)^2^ + 0.00P]
,where P=(max(Fo^2^,0) + 2Fc^2^)/3
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1020
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_reflns_limit_k_min              0
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_reflns_limit_l_min              0
_reflns_number_gt                1276
_reflns_number_total             1723
_reflns_threshold_expression     I>2.0\s(I)
_oxford_diffrn_Wilson_B_factor   2.04
_oxford_diffrn_Wilson_scale      3.24
_oxford_refine_ls_r_factor_ref   0.0536
_oxford_refine_ls_scale          0.5422(17)
_oxford_reflns_number_all        1723
_oxford_reflns_threshold_expression_ref I>-3.0\s(I)
_cod_data_source_file            c2ob06849d.txt
_cod_data_source_block           AxOH
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' 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_sg_symbol_H-M      'P b c a '
_cod_database_code               7152304