Synthesis, Structure, and Bonding of 1-Oxa-6,6aλ(4)- chalcogenopentalenes and Related Derivatives; The Role of Intramolecular Coordination.
Prasad, Poonam Rajesh; Selvakumar, Karuthapandi; Singh, Harkesh B.; Butcher, Ray J.; The Journal of organic chemistry 81 (2016) 3214–3226; doi:10.1021/acs.joc.6b00173

data_4036643
_publ_section_title
;
 Synthesis, Structure, and Bonding of 1-Oxa-6,6a\l(4)-
 chalcogenopentalenes and Related Derivatives; The Role of Intramolecular
 Coordination.
;
_journal_issue                   8
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              3214
_journal_page_last               3226
_journal_paper_doi               10.1021/acs.joc.6b00173
_journal_volume                  81
_journal_year                    2016
_chemical_formula_moiety         'C8 H8 O2 Te'
_chemical_formula_sum            'C8 H8 O2 Te'
_chemical_formula_weight         263.74
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_H-M   'P 21 21 21'
_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            4
_cell_length_a                   5.0396(3)
_cell_length_b                   6.4746(5)
_cell_length_c                   23.7857(14)
_cell_measurement_reflns_used    768
_cell_measurement_temperature    123(2)
_cell_measurement_theta_max      75.3605
_cell_measurement_theta_min      3.7112
_cell_volume                     776.11(9)
_computing_cell_refinement
;
CrysAlisPro, Agilent Technologies,
Version 1.171.35.21 (release 20-01-2012 CrysAlis171 .NET)
(compiled Jan 23 2012,18:06:46)
;
_computing_data_collection
;
CrysAlisPro, Agilent Technologies,
Version 1.171.35.21 (release 20-01-2012 CrysAlis171 .NET)
(compiled Jan 23 2012,18:06:46)
;
_computing_data_reduction
;
CrysAlisPro, Agilent Technologies,
Version 1.171.35.21 (release 20-01-2012 CrysAlis171 .NET)
(compiled Jan 23 2012,18:06:46)
;
_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      123(2)
_diffrn_detector_area_resol_mean 10.5081
_diffrn_measured_fraction_theta_full 0.946
_diffrn_measured_fraction_theta_max 0.898
_diffrn_measurement_device_type  'Xcalibur, Ruby, Gemini'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Enhance (Cu) X-ray Source'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0985
_diffrn_reflns_av_sigmaI/netI    0.0560
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       3
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            1622
_diffrn_reflns_theta_full        67.50
_diffrn_reflns_theta_max         76.20
_diffrn_reflns_theta_min         7.09
_exptl_absorpt_coefficient_mu    29.806
_exptl_absorpt_correction_T_max  0.467
_exptl_absorpt_correction_T_min  0.027
_exptl_absorpt_correction_type   analytical
_exptl_absorpt_process_details
;
CrysAlisPro, Agilent Technologies,
Version 1.171.35.21 (release 20-01-2012 CrysAlis171 .NET)
(compiled Jan 23 2012,18:06:46)
Analytical numeric absorption correction using a multifaceted crystal
			model based on expressions derived by R.C. Clark & J.S. Reid.
(Clark, R. C. & Reid, J. S. (1995). Acta Cryst. A51, 887-897)
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    2.257
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             496
_exptl_crystal_size_max          0.3857
_exptl_crystal_size_mid          0.3041
_exptl_crystal_size_min          0.0279
_refine_diff_density_max         1.478
_refine_diff_density_min         -2.070
_refine_diff_density_rms         0.281
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.01(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.081
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     100
_refine_ls_number_reflns         1254
_refine_ls_number_restraints     24
_refine_ls_restrained_S_all      1.077
_refine_ls_R_factor_all          0.0708
_refine_ls_R_factor_gt           0.0630
_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^)+(0.1367P)^2^+0.4095P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1647
_refine_ls_wR_factor_ref         0.1750
_reflns_number_gt                1112
_reflns_number_total             1254
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo6b00173_si_006.cif
_cod_data_source_block           37
_cod_original_cell_volume        776.12(9)
_cod_database_code               4036643