Stereoselective preparation of conjugated (Z)-1,3-enynes by dehydration reactions of allenic bromohydrins and the use of the enynes in base-mediated tandem allylation ene-carbocyclization reactions with β-ketoesters.
Lin, Mei-Huey; Chen, Yu-Chun; Chiu, Shih-Hao; Liang, Kung-Yu; Lee, Yi-Lin; Chuang, Tsung-Hsun; Organic & biomolecular chemistry 15 (2017) 605–609; doi:10.1039/c6ob02178f

data_7155410
_publ_section_title
;
 Stereoselective preparation of conjugated (Z)-1,3-enynes by dehydration
 reactions of allenic bromohydrins and the use of the enynes in
 base-mediated tandem allylation ene-carbocyclization reactions with
 \b-ketoesters.
;
_journal_issue                   3
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              605
_journal_page_last               609
_journal_paper_doi               10.1039/c6ob02178f
_journal_volume                  15
_journal_year                    2017
_chemical_formula_sum            'C17 H17 Br O3'
_chemical_formula_weight         349.21
_space_group_IT_number           1
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  'P 1'
_symmetry_space_group_name_H-M   'P 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2016-08-22 deposited with the CCDC.
2016-12-06 downloaded from the CCDC.
;
_cell_angle_alpha                94.761(4)
_cell_angle_beta                 94.576(4)
_cell_angle_gamma                98.120(4)
_cell_formula_units_Z            2
_cell_length_a                   7.5076(6)
_cell_length_b                   7.9269(6)
_cell_length_c                   13.2339(10)
_cell_measurement_reflns_used    5786
_cell_measurement_temperature    150
_cell_measurement_theta_max      28.6835
_cell_measurement_theta_min      2.6075
_cell_volume                     773.64(10)
_computing_cell_refinement       'SAINT V7.68A (Bruker AXS, 2009)'
_computing_data_collection       'APEX2 (Bruker AXS, 2010)'
_computing_data_reduction        'SAINT V7.68A (Bruker AXS, 2009)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2008)'
_computing_publication_material  'SHELXTL (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      150
_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       /w
_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  0.0336
_diffrn_reflns_av_sigmaI/netI    0.0510
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            9113
_diffrn_reflns_theta_full        28.28
_diffrn_reflns_theta_max         28.28
_diffrn_reflns_theta_min         2.61
_exptl_absorpt_coefficient_mu    2.664
_exptl_absorpt_correction_T_max  0.7405
_exptl_absorpt_correction_T_min  0.6752
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS V2008/1 (Bruker AXS, 2008)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.499
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             356
_exptl_crystal_size_max          0.16
_exptl_crystal_size_mid          0.14
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.415
_refine_diff_density_min         -0.569
_refine_diff_density_rms         0.080
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.279(19)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.763
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     385
_refine_ls_number_reflns         5920
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      0.762
_refine_ls_R_factor_all          0.0336
_refine_ls_R_factor_gt           0.0303
_refine_ls_shift/su_max          0.150
_refine_ls_shift/su_mean         0.028
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1000P)^2^+0.1400P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0951
_refine_ls_wR_factor_ref         0.0989
_reflns_number_gt                5410
_reflns_number_total             5920
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c6ob02178f2.cif
_cod_data_source_block           csh_03_4106
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
according to
/usr/data/users/saulius/crontab/automatic-downloads/rss-feeds/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 4268 2015-11-12 08:31:59Z antanas 

 Adding full bibliography for 7155409--7155411.cif.

2017-11-19
Z value and formula fixed to values more according to usual
chemical conventions.                 miguel
;
_cod_original_sg_symbol_H-M      P1
_cod_original_formula_sum        'C34 H34 Br2 O6'
_cod_original_formula_units_Z    1
_cod_original_formula_weight     698.43
_cod_database_code               7155410