Visible light-mediated ipso-annulation of activated alkynes: access to 3-alkylated spiro[4,5]-trienones, thiaspiro[4,5]-trienones and azaspiro[4,5]-trienones.
Manna, Sabyasachi; Someswara Ashwathappa, Puneeth Kumar; Prabhu, Kandikere Ramaiah; Chemical communications (Cambridge, England) 56 (2020) 13165–13168; doi:10.1039/d0cc01217c

data_7127313
_publ_section_title
;
 Visible light-mediated ipso-annulation of activated alkynes: access to
 3-alkylated spiro[4,5]-trienones, thiaspiro[4,5]-trienones and
 azaspiro[4,5]-trienones.
;
_journal_issue                   86
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              13165
_journal_page_last               13168
_journal_paper_doi               10.1039/d0cc01217c
_journal_volume                  56
_journal_year                    2020
_chemical_formula_moiety         'C25 H24 O9'
_chemical_formula_sum            'C25 H24 O9'
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_chemical_name_systematic
'triethyl (2,8-dioxo-4-phenyl-1-oxaspiro[4.5]deca-3,6,9-trien-3-yl)methanetricarboxylate'
_space_group_crystal_system      orthorhombic
_space_group_IT_number           61
_space_group_name_Hall           '-P 2ac 2ab'
_space_group_name_H-M_alt        'P b c a'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2013
_audit_update_record
;
2020-01-09 deposited with the CCDC.	2020-09-21 downloaded from the CCDC.
;
_cell_angle_alpha                90
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_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      27.6
_cell_measurement_theta_min      2.9
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_computing_structure_refinement  'SHELXL-2013 (Sheldrick, 2013)'
_diffrn_ambient_temperature      296(2)
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_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Bruker APEX-III CCD'
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_diffrn_reflns_Laue_measured_fraction_full 0.999
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_diffrn_reflns_point_group_measured_fraction_full 0.999
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_diffrn_reflns_theta_max         27.632
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_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.277
_exptl_crystal_description       'Needle Shaped'
_exptl_crystal_F_000             1968
_exptl_crystal_size_max          0.25
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_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.1000P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2705
_refine_ls_wR_factor_ref         0.2903
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3302
_reflns_number_total             5649
_reflns_threshold_expression     'I > 2\s(I)'
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_cod_data_source_block           shelx
_cod_depositor_comments          'Adding full bibliography for 7127313.cif.'
_cod_database_code               7127313
_shelx_estimated_absorpt_t_min   0.983
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_shelxl_version_number           2013-4
_shelx_res_checksum              37003