Aluminum Triflate Catalyzed Tandem Reactions of d-Galactal: Toward Chiral Benzopyrans, Chromenes, and Chromans.
Simelane, Sandile B.; Kinfe, Henok H.; Muller, Alfred; Williams, D Bradley G; Organic letters 16 (2014) 4543–; doi:10.1021/ol502305j

data_1517461
_publ_section_title
;
 Aluminum Triflate Catalyzed Tandem Reactions of d-Galactal: Toward Chiral
 Benzopyrans, Chromenes, and Chromans.
;
_journal_issue                   17
_journal_name_full               'Organic letters'
_journal_page_first              4543
_journal_paper_doi               10.1021/ol502305j
_journal_volume                  16
_journal_year                    2014
_chemical_absolute_configuration rm
_chemical_formula_moiety         'C17 H20 O6'
_chemical_formula_sum            'C17 H20 O6'
_chemical_formula_weight         320.33
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   7.0361(7)
_cell_length_b                   14.3568(14)
_cell_length_c                   15.7212(16)
_cell_measurement_reflns_used    9505
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.26
_cell_measurement_theta_min      2.59
_cell_volume                     1588.1(3)
_computing_cell_refinement       'SAINT (Bruker, 2008)'
_computing_data_collection       'APEX2 (Bruker, 2011)'
_computing_data_reduction        'SAINT and XPREP (Bruker, 2008)'
_computing_molecular_graphics    'DIAMOND (Brandenburg & Putz, 2005)'
_computing_publication_material
'publCIF (Westrip, 2010) & WinGX (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-2014 (Sheldrick, 2014)'
_computing_structure_solution    'SIR97 (Altomare <i>et al.</i>, 1999)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 8.4
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX-DUO 4K CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0389
_diffrn_reflns_av_unetI/netI     0.0159
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            47669
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.998
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         28.335
_diffrn_reflns_theta_min         1.921
_exptl_absorpt_coefficient_mu    0.102
_exptl_absorpt_correction_T_max  0.7457
_exptl_absorpt_correction_T_min  0.6620
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Bruker, 2008)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.340
_exptl_crystal_description       block
_exptl_crystal_F_000             680
_exptl_crystal_size_max          0.220
_exptl_crystal_size_mid          0.150
_exptl_crystal_size_min          0.100
_refine_diff_density_max         0.252
_refine_diff_density_min         -0.174
_refine_diff_density_rms         0.040
_refine_ls_abs_structure_details
; 
 Flack x determined using 1574 quotients [(I+)-(I-)]/[(I+)+(I-)] 
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259). 
;
_refine_ls_abs_structure_Flack   -0.16(18)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.036
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     211
_refine_ls_number_reflns         3947
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.036
_refine_ls_R_factor_all          0.0315
_refine_ls_R_factor_gt           0.0293
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0486P)^2^+0.3221P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0779
_refine_ls_wR_factor_ref         0.0801
_reflns_Friedel_coverage         0.740
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     0.998
_reflns_number_gt                3772
_reflns_number_total             3947
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ol502305j_si_002.cif
_cod_data_source_block           structure4c
_cod_depositor_comments
'Adding full bibliography for 1517461--1517464.cif.'
_cod_database_code               1517461
_shelx_estimated_absorpt_t_min   0.978
_shelx_estimated_absorpt_t_max   0.990
_shelxl_version_number           2014-3
_shelx_res_checksum              56238
_shelx_hkl_checksum              42423