Brønsted Acid-Catalyzed Cycloisomerization of But-2-yne-1,4-diols with or without 1,3-Dicarbonyl Compounds to Tri- and Tetrasubstituted Furans
Srinivasa Reddy Mothe; Sherman Jun Liang Lauw; Prasath Kothandaraman; Philip Wai Hong Chan; Journal of Organic Chemistry 77 (2012) 6937–6947; doi:10.1021/jo301093f

data_4027386
_publ_section_title
;
 Br\/onsted Acid-Catalyzed Cycloisomerization of But-2-yne-1,4-diols with
 or without 1,3-Dicarbonyl Compounds to Tri- and Tetrasubstituted Furans
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              6937
_journal_page_last               6947
_journal_paper_doi               10.1021/jo301093f
_journal_volume                  77
_journal_year                    2012
_chemical_formula_moiety         'C31 H22 O2'
_chemical_formula_sum            'C31 H22 O2'
_chemical_formula_weight         426.49
_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
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   8.9009(8)
_cell_length_b                   17.7250(17)
_cell_length_c                   28.318(3)
_cell_measurement_reflns_used    1593
_cell_measurement_temperature    153(2)
_cell_measurement_theta_max      24.08
_cell_measurement_theta_min      3.32
_cell_volume                     4467.7(8)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      153(2)
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_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  0.0000
_diffrn_reflns_av_sigmaI/netI    0.1192
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       37
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            5506
_diffrn_reflns_theta_full        28.32
_diffrn_reflns_theta_max         28.32
_diffrn_reflns_theta_min         2.30
_exptl_absorpt_coefficient_mu    0.078
_exptl_absorpt_correction_T_max  0.9953
_exptl_absorpt_correction_T_min  0.9695
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.268
_exptl_crystal_description       needle
_exptl_crystal_F_000             1792
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.407
_refine_diff_density_min         -0.467
_refine_diff_density_rms         0.155
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.943
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     298
_refine_ls_number_reflns         5506
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.943
_refine_ls_R_factor_all          0.1487
_refine_ls_R_factor_gt           0.0673
_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^)+(0.1012P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1623
_refine_ls_wR_factor_ref         0.1980
_reflns_number_gt                2802
_reflns_number_total             5506
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo301093f_si_003.cif
_cod_data_source_block           chan215s_0m
_cod_original_cell_volume        4467.8(7)
_cod_database_code               4027386