Fast Oxy-Cope Rearrangements of Bis-alkynes: Competition with Central C-C Bond Fragmentation and Incorporation in Tunable Cascades Diverging from a Common Bis-allenic Intermediate
Runa Pal; Ronald J. Clark; Mariappan Manoharan; Igor V. Alabugin; Journal of Organic Chemistry 75 (2010) 8689–8692; doi:10.1021/jo101838a

data_4025883
_publ_section_title
;
 Fast Oxy-Cope Rearrangements of Bis-alkynes: Competition with Central C-C
 Bond Fragmentation and Incorporation in Tunable Cascades Diverging from a
 Common Bis-allenic Intermediate
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              8689
_journal_page_last               8692
_journal_paper_doi               10.1021/jo101838a
_journal_volume                  75
_journal_year                    2010
_chemical_formula_moiety         'C24 H30 O2 Si2'
_chemical_formula_sum            'C24 H30 O2 Si2'
_chemical_formula_weight         406.66
_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                 90.882(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   42.448(6)
_cell_length_b                   9.5441(13)
_cell_length_c                   11.4778(16)
_cell_measurement_reflns_used    1512
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      19.13
_cell_measurement_theta_min      2.57
_cell_volume                     4649.4(11)
_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      100(2)
_diffrn_measured_fraction_theta_full 0.920
_diffrn_measured_fraction_theta_max 0.920
_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  0.0310
_diffrn_reflns_av_sigmaI/netI    0.0436
_diffrn_reflns_limit_h_max       38
_diffrn_reflns_limit_h_min       -39
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -7
_diffrn_reflns_number            3563
_diffrn_reflns_theta_full        19.19
_diffrn_reflns_theta_max         19.19
_diffrn_reflns_theta_min         1.92
_exptl_absorpt_coefficient_mu    0.169
_exptl_absorpt_correction_T_max  0.9883
_exptl_absorpt_correction_T_min  0.9356
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.162
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       long
_exptl_crystal_F_000             1744
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.07
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.414
_refine_diff_density_min         -0.343
_refine_diff_density_rms         0.051
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   2.253
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     264
_refine_ls_number_reflns         1779
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      2.253
_refine_ls_R_factor_all          0.0861
_refine_ls_R_factor_gt           0.0588
_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^)+(0.0000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0748
_refine_ls_wR_factor_ref         0.0790
_reflns_number_gt                1319
_reflns_number_total             1779
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo101838a_si_002.cif
_cod_data_source_block           igor80
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to the built-in table from CIF Core dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1646 2011-03-28 12:23:43Z adriana 
;
_cod_original_cell_volume        4649.5(11)
_cod_original_sg_symbol_Hall     -C2yc
_cod_database_code               4025883