Lewis acid-catalysed one pot synthesis of substituted xanthenes.
Böß, Esther; Hillringhaus, Tim; Nitsch, Jacqueline; Klussmann, Martin; Organic & biomolecular chemistry 9 (2011) 1744–1748; doi:10.1039/C0OB00954G

data_7151723
_publ_section_title
;
 Lewis acid-catalysed one pot synthesis of substituted xanthenes.
;
_journal_issue                   6
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              1744
_journal_page_last               1748
_journal_paper_doi               10.1039/C0OB00954G
_journal_volume                  9
_journal_year                    2011
_chemical_absolute_configuration rmad
_chemical_compound_source        diethylether,pentane
_chemical_formula_moiety         'C18 H14 O'
_chemical_formula_sum            'C18 H14 O'
_chemical_formula_weight         246.29
_chemical_melting_point          100
_space_group_IT_number           14
_symmetry_Int_Tables_number      14
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_block_code                BSR-BC-106-01
_audit_creation_date             2010-08-12
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 93.296(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   4.7615(5)
_cell_length_b                   11.9406(12)
_cell_length_c                   21.373(2)
_cell_measurement_reflns_used    9977
_cell_measurement_temperature    100
_cell_measurement_theta_max      35.2873
_cell_measurement_theta_min      2.5601
_cell_volume                     1213.2(2)
_computing_cell_refinement       'SAINT software (Bruker AXS, 2004)'
_computing_data_collection       'APEX2 (Bruker AXS, 2008)'
_computing_data_reduction        'SAINT software (Bruker AXS, 2004)'
_computing_molecular_graphics    'DIAMOND (Crystal Impact GbR, 2005)'
_computing_structure_refinement  'SHELXL-97 (G. M. Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (G. M. Sheldrick, 2008)'
_diffrn_ambient_temperature      100
_diffrn_detector_area_resol_mean 66.67
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Bruker-AXS Kappa Mach3 APEX-II'
_diffrn_measurement_method       'CCD \f- and \w-scans'
_diffrn_radiation_monochromator  'Incoatec Helios mirrors'
_diffrn_radiation_source         '0.2 x 2mm^2^ focus rotating anode'
_diffrn_radiation_type           Mo-K\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0768
_diffrn_reflns_av_sigmaI/netI    0.0339
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       34
_diffrn_reflns_limit_l_min       -34
_diffrn_reflns_number            69156
_diffrn_reflns_theta_full        35.47
_diffrn_reflns_theta_max         35.47
_diffrn_reflns_theta_min         2.56
_exptl_absorpt_coefficient_mu    0.082
_exptl_absorpt_correction_T_max  0.99853
_exptl_absorpt_correction_T_min  0.99418
_exptl_absorpt_correction_type   gaussian
_exptl_absorpt_process_details   'SADABS (Bruker AXS, 2008)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.348
_exptl_crystal_description       prism
_exptl_crystal_F_000             520
_exptl_crystal_size_max          0.10
_exptl_crystal_size_mid          0.06
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.627
_refine_diff_density_min         -0.221
_refine_diff_density_rms         0.065
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.037
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     173
_refine_ls_number_reflns         5495
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.037
_refine_ls_R_factor_all          0.0566
_refine_ls_R_factor_gt           0.0448
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0741P)^2^+0.2634P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1263
_refine_ls_wR_factor_ref         0.1358
_reflns_number_gt                4430
_reflns_number_total             5495
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            C0OB00954G.TXT
_cod_data_source_block           7060sadabs
_cod_original_cell_volume        1213.1(2)
_cod_original_sg_symbol_Hall     '-p 2ybc'
_cod_original_sg_symbol_H-M      'p 21/c'
_cod_database_code               7151723