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_4027388
_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         'C35 H30 O2'
_chemical_formula_sum            'C35 H30 O2'
_chemical_formula_weight         482.59
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_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                 131.3300(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   27.0519(5)
_cell_length_b                   14.3057(3)
_cell_length_c                   18.1255(6)
_cell_measurement_reflns_used    7092
_cell_measurement_temperature    153(2)
_cell_measurement_theta_max      29.81
_cell_measurement_theta_min      2.69
_cell_volume                     5267.3(2)
_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 0.990
_diffrn_measured_fraction_theta_max 0.990
_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  0.0421
_diffrn_reflns_av_sigmaI/netI    0.0413
_diffrn_reflns_limit_h_max       38
_diffrn_reflns_limit_h_min       -37
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            38628
_diffrn_reflns_theta_full        30.55
_diffrn_reflns_theta_max         30.55
_diffrn_reflns_theta_min         1.74
_exptl_absorpt_coefficient_mu    0.074
_exptl_absorpt_correction_T_max  0.9825
_exptl_absorpt_correction_T_min  0.9711
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.217
_exptl_crystal_description       block
_exptl_crystal_F_000             2048
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.24
_refine_diff_density_max         0.312
_refine_diff_density_min         -0.260
_refine_diff_density_rms         0.065
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.038
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     337
_refine_ls_number_reflns         7993
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.038
_refine_ls_R_factor_all          0.0824
_refine_ls_R_factor_gt           0.0502
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0954P)^2^+0.8111P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1355
_refine_ls_wR_factor_ref         0.1657
_reflns_number_gt                5551
_reflns_number_total             7993
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo301093f_si_005.cif
_cod_data_source_block           chan217s
_cod_database_code               4027388