Stereoselective rearrangement of guaianolides to tricyclic δ-valerolactones.
Schanderl, Martin; Jeong, Won Boo; Schwarz, Michael; Reiser, Oliver; Organic & biomolecular chemistry 9 (2011) 2543–2547; doi:10.1039/c0ob00919a

data_7151772
_publ_section_title
;
 Stereoselective rearrangement of guaianolides to tricyclic
 \d-valerolactones.
;
_journal_issue                   7
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              2543
_journal_page_last               2547
_journal_paper_doi               10.1039/c0ob00919a
_journal_volume                  9
_journal_year                    2011
_chemical_absolute_configuration syn
_chemical_compound_source        'see text'
_chemical_formula_moiety         'C15 H20 O4'
_chemical_formula_sum            'C15 H20 O4'
_chemical_formula_weight         264.31
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      4
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90
_cell_angle_beta                 95.532(11)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   5.6695(5)
_cell_length_b                   13.7791(13)
_cell_length_c                   18.0400(17)
_cell_measurement_reflns_used    7034
_cell_measurement_temperature    297
_cell_measurement_theta_max      25.91
_cell_measurement_theta_min      1.86
_cell_volume                     1402.7(2)
_computing_cell_refinement       'STOE (1998)'
_computing_data_collection       'STOE (1998)'
_computing_data_reduction        'STOE (1998)'
_computing_molecular_graphics    'PLATON (Spek, 1990)'
_computing_publication_material  'PLATON (Spek, 2003)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR-97 (Altomare, 1999)'
_diffrn_ambient_temperature      297(1)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'STOE-IPDS diffractometer'
_diffrn_measurement_method       rotation
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0551
_diffrn_reflns_av_sigmaI/netI    0.0591
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            19944
_diffrn_reflns_reduction_process
;
;
_diffrn_reflns_theta_full        25.91
_diffrn_reflns_theta_max         25.91
_diffrn_reflns_theta_min         1.86
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.090
_exptl_absorpt_correction_T_max  0.982
_exptl_absorpt_correction_T_min  0.972
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            'translucent colourless'
_exptl_crystal_density_diffrn    1.252
_exptl_crystal_density_method    'Not Measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             568
_exptl_crystal_size_max          0.320
_exptl_crystal_size_mid          0.240
_exptl_crystal_size_min          0.200
_refine_diff_density_max         0.161
_refine_diff_density_min         -0.144
_refine_diff_density_rms         0.033
_refine_ls_abs_structure_details 'Flack H.D. (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.3(13)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.788
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     343
_refine_ls_number_reflns         5396
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.788
_refine_ls_R_factor_all          0.1075
_refine_ls_R_factor_gt           0.0469
_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^)+(0.0615P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1047
_refine_ls_wR_factor_ref         0.1228
_reflns_number_gt                2515
_reflns_number_total             5396
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            c0ob00919a.txt
_cod_data_source_block           i201
_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_enum 1555 2011-01-17 13:19:09Z saulius 
;
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               7151772