Synthesis of naphth[2,1-<i>a</i>]azulenes <i>via</i> [8 + 2] cycloaddition of 2<i>H</i>-cyclohepta[<i>b</i>]furan-2-ones, and their reactivity, optical, and structural properties.
Shoji, Taku; Yamazaki, Akari; Yoshida, Miku; Yasunami Deceased, Masafumi; Mori, Shigeki; Okujima, Tetsuo; Kamayachi, Takumi; Uchiyama, Ikumi; Sekiguchi, Ryuta; Ito, Shunji; Organic & biomolecular chemistry 23 (2025) 10088–10099; doi:10.1039/d5ob01492a

data_7160796
_publ_section_title
;
 Synthesis of naphth[2,1-<i>a</i>]azulenes <i>via</i> [8 + 2]
 cycloaddition of 2<i>H</i>-cyclohepta[<i>b</i>]furan-2-ones, and their
 reactivity, optical, and structural properties.
;
_journal_issue                   44
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              10088
_journal_page_last               10099
_journal_paper_doi               10.1039/d5ob01492a
_journal_volume                  23
_journal_year                    2025
_chemical_formula_moiety         'C22 H20'
_chemical_formula_sum            'C22 H20'
_chemical_formula_weight         284.38
_space_group_crystal_system      monoclinic
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_date             2021-09-17
_audit_creation_method
;
Olex2 1.5
(compiled 2021.08.20 svn.r13c46975 for OlexSys, GUI svn.r6396)
;
_audit_update_record
;
2021-09-21 deposited with the CCDC.	2025-10-13 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 95.549(4)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   11.2176(6)
_cell_length_b                   5.5152(2)
_cell_length_c                   12.5147(5)
_cell_measurement_reflns_used    10101
_cell_measurement_temperature    100
_cell_measurement_theta_max      30.8780
_cell_measurement_theta_min      1.8200
_cell_volume                     770.62(6)
_computing_cell_refinement       'CrysAlisPro 1.171.41.93a (Rigaku OD, 2020)'
_computing_data_collection       'CrystalClear-SM Expert 2.1 b46 (Rigaku, 2016)'
_computing_data_reduction        'CrysAlisPro 1.171.41.93a (Rigaku OD, 2020)'
_computing_molecular_graphics    'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_structure_refinement  'SHELXL-2018/3 (Sheldrick, 2018)'
_computing_structure_solution    'SHELXT 2018/2 (Sheldrick, 2018)'
_diffrn_ambient_temperature      100
_diffrn_detector                 CCD
_diffrn_detector_area_resol_mean 7.111
_diffrn_detector_type            'Rigaku Saturn724+ area detector'
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.936
_diffrn_measurement_details
;
List of Runs (angles in degrees, time in seconds):

  # Type    Start    End  Width  t~exp~   \w     \q     \k     \f   Frames
  1  \w   -105.00  75.00   0.50    1.00    --  -15.00  45.00   0.00  360
  2  \w   -105.00  75.00   0.50    1.00    --  -15.00  45.00  90.00  360
  3  \w   -105.00  75.00   0.50    1.00    --  -15.00  45.00 180.00  360
  4  \w   -105.00  75.00   0.50    1.00    --  -15.00  45.00 270.00  360
;
_diffrn_measurement_device_type  'Rigaku Varimax with Saturn'
_diffrn_measurement_method       '\w scans'
_diffrn_orient_matrix_type
'CrysAlisPro convention (1999,Acta A55,543-557)'
_diffrn_orient_matrix_UB_11      -0.0046429000
_diffrn_orient_matrix_UB_12      -0.1157933000
_diffrn_orient_matrix_UB_13      -0.0247433000
_diffrn_orient_matrix_UB_21      -0.0099753000
_diffrn_orient_matrix_UB_22      0.0559152000
_diffrn_orient_matrix_UB_23      -0.0511198000
_diffrn_orient_matrix_UB_31      0.0625573000
_diffrn_orient_matrix_UB_32      0.0003479000
_diffrn_orient_matrix_UB_33      -0.0044016000
_diffrn_radiation_collimation    0.3
_diffrn_radiation_monochromator  'multi-layer mirror optics'
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0966
_diffrn_reflns_av_unetI/netI     0.0782
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.936
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            15985
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.905
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         30.778
_diffrn_reflns_theta_min         1.635
_diffrn_source                   'rotating anode X-ray generator'
_diffrn_source_current           24.0
_diffrn_source_power             1.2
_diffrn_source_target            Mo
_diffrn_source_type              'MicroMax 007'
_diffrn_source_voltage           50.0
_exptl_absorpt_coefficient_mu    0.069
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.16768
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.41.93a (Rigaku Oxford Diffraction, 2020)
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            green
_exptl_crystal_colour_primary    green
_exptl_crystal_density_diffrn    1.226
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             304
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.05
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.378
_refine_diff_density_min         -0.267
_refine_diff_density_rms         0.065
_refine_ls_abs_structure_details
;
 Flack x determined using 1116 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   1.8(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.072
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     202
_refine_ls_number_reflns         4333
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.072
_refine_ls_R_factor_all          0.0866
_refine_ls_R_factor_gt           0.0665
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0966P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1622
_refine_ls_wR_factor_ref         0.1751
_reflns_Friedel_coverage         0.766
_reflns_Friedel_fraction_full    0.998
_reflns_Friedel_fraction_max     0.867
_reflns_number_gt                3397
_reflns_number_total             4333
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d5ob01492a2.cif
_cod_data_source_block           shoji_b_autored
_cod_depositor_comments
'Adding full bibliography for 7160792--7160797.cif.'
_cod_database_code               7160796
_shelx_shelxl_version_number     2018/3
_chemical_oxdiff_formula         C20H22
_shelx_estimated_absorpt_t_max   0.999
_shelx_estimated_absorpt_t_min   0.985
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Ternary CH refined with riding coordinates:
 C20(H20)
2.b Aromatic/amide H refined with riding coordinates:
 C1(H1), C2(H2), C3(H3), C4(H4), C7(H7), C10(H10), C11(H11), C12(H12),
 C14(H14), C16(H16)
2.c Idealised Me refined as rotating group:
 C19(H19A,H19B,H19C), C21(H21A,H21B,H21C), C22(H22A,H22B,H22C)
;
_shelx_res_checksum              60536
_olex2_exptl_crystal_mounting_method loop
_olex2_submission_special_instructions 'No special instructions were received'
_oxdiff_exptl_absorpt_empirical_details
;
Empirical correction (ABSPACK) includes:
- Absorption correction using spherical harmonics
- Frame scaling
- Detector area scaling
;
_oxdiff_exptl_absorpt_empirical_full_max 3.939
_oxdiff_exptl_absorpt_empirical_full_min 0.354