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_7160792
_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         'C21 H20'
_chemical_formula_sum            'C21 H20'
_chemical_formula_weight         272.37
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_date             2020-11-16
_audit_creation_method
;
Olex2 1.3
(compiled 2020.07.31 svn.rc2a77460 for OlexSys, GUI svn.r6145)
;
_audit_update_record
;
2020-11-17 deposited with the CCDC.	2025-10-13 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 101.559(7)
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   10.2316(5)
_cell_length_b                   28.9675(15)
_cell_length_c                   10.4047(5)
_cell_measurement_reflns_used    15529
_cell_measurement_temperature    100
_cell_measurement_theta_max      78.25
_cell_measurement_theta_min      3.05
_cell_volume                     3021.2(3)
_computing_cell_refinement       'RAPID AUTO (Rigaku, 2012)'
_computing_data_collection       'RAPID AUTO (Rigaku, 2012)'
_computing_data_reduction        'RAPID AUTO (Rigaku, 2012)'
_computing_molecular_graphics    'Olex2 1.3 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.3 (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                 'Rigaku curved IP area detector'
_diffrn_detector_area_resol_mean 10.000
_diffrn_detector_type            'Imaging plate area detector'
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Rigaku Varimax with RAPID'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_collimation    1.0
_diffrn_radiation_monochromator  'multi-layer mirror optics'
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.5418
_diffrn_reflns_av_R_equivalents  0.0531
_diffrn_reflns_av_unetI/netI     0.0469
_diffrn_reflns_Laue_measured_fraction_full 0.997
_diffrn_reflns_Laue_measured_fraction_max 0.997
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       34
_diffrn_reflns_limit_k_min       -34
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            33774
_diffrn_reflns_point_group_measured_fraction_full 0.997
_diffrn_reflns_point_group_measured_fraction_max 0.997
_diffrn_reflns_theta_full        67.680
_diffrn_reflns_theta_max         68.246
_diffrn_reflns_theta_min         3.051
_diffrn_source                   'rotating anode X-ray generator'
_diffrn_source_current           30.0
_diffrn_source_power             1.2
_diffrn_source_target            Cu
_diffrn_source_type              'MicroMax 007'
_diffrn_source_voltage           40.0
_exptl_absorpt_coefficient_mu    0.503
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.7322
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'ABSCOR (Rigaku, 1995)'
_exptl_crystal_colour            blue
_exptl_crystal_colour_primary    blue
_exptl_crystal_density_diffrn    1.198
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1168
_exptl_crystal_size_max          0.23
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.01
_refine_diff_density_max         0.197
_refine_diff_density_min         -0.221
_refine_diff_density_rms         0.043
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.042
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     575
_refine_ls_number_reflns         5519
_refine_ls_number_restraints     1409
_refine_ls_restrained_S_all      0.948
_refine_ls_R_factor_all          0.0842
_refine_ls_R_factor_gt           0.0592
_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^)+(0.1018P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1633
_refine_ls_wR_factor_ref         0.1775
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3661
_reflns_number_total             5519
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d5ob01492a2.cif
_cod_data_source_block           shelx_trans
_cod_depositor_comments
'Adding full bibliography for 7160792--7160797.cif.'
_cod_database_code               7160792
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_max   0.995
_shelx_estimated_absorpt_t_min   0.893
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2. Uiso/Uaniso restraints and constraints
C1 \\sim C2 \\sim C3 \\sim C4 \\sim C5 \\sim C6 \\sim C7 \\sim C8 \\sim C9
\\sim C10 \\sim C11 \\sim C12 \\sim C13 \\sim C14 \\sim C15 \\sim C16 \\sim C17
\\sim C18 \\sim C19 \\sim C20 \\sim C21 \\sim C101 \\sim C102 \\sim C103 \\sim
C104 \\sim C105 \\sim C106 \\sim C107 \\sim C108 \\sim C109 \\sim C110 \\sim
C111 \\sim C112 \\sim C113 \\sim C114 \\sim C115 \\sim C116 \\sim C117 \\sim
C118 \\sim C119 \\sim C120 \\sim C121: within 2A with sigma of 0.02 and sigma
for terminal atoms of 0.04 within 2A
Uanis(C1) \\sim Ueq, Uanis(C2) \\sim Ueq, Uanis(C3) \\sim Ueq, Uanis(C4) \\sim
Ueq, Uanis(C5) \\sim Ueq, Uanis(C6) \\sim Ueq, Uanis(C7) \\sim Ueq, Uanis(C8)
\\sim Ueq, Uanis(C9) \\sim Ueq, Uanis(C10) \\sim Ueq, Uanis(C11) \\sim Ueq,
Uanis(C12) \\sim Ueq, Uanis(C13) \\sim Ueq, Uanis(C14) \\sim Ueq, Uanis(C15)
\\sim Ueq, Uanis(C16) \\sim Ueq, Uanis(C17) \\sim Ueq, Uanis(C18) \\sim Ueq,
Uanis(C19) \\sim Ueq, Uanis(C20) \\sim Ueq, Uanis(C21) \\sim Ueq, Uanis(C101)
\\sim Ueq, Uanis(C102) \\sim Ueq, Uanis(C103) \\sim Ueq, Uanis(C104) \\sim Ueq,
Uanis(C105) \\sim Ueq, Uanis(C106) \\sim Ueq, Uanis(C107) \\sim Ueq,
Uanis(C108) \\sim Ueq, Uanis(C109) \\sim Ueq, Uanis(C110) \\sim Ueq,
Uanis(C111) \\sim Ueq, Uanis(C112) \\sim Ueq, Uanis(C113) \\sim Ueq,
Uanis(C114) \\sim Ueq, Uanis(C115) \\sim Ueq, Uanis(C116) \\sim Ueq,
Uanis(C117) \\sim Ueq, Uanis(C118) \\sim Ueq, Uanis(C119) \\sim Ueq,
Uanis(C120) \\sim Ueq, Uanis(C121) \\sim Ueq: with sigma of 0.02 and sigma for
terminal atoms of 0.04
3. Rigid body (RIGU) restrains
 C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17,
 C18, C19, C20, C21, C101, C102, C103, C104, C105, C106, C107, C108, C109, C110,
  C111, C112, C113, C114, C115, C116, C117, C118, C119, C120, C121
 with sigma for 1-2 distances of 0.004 and sigma for 1-3 distances of 0.004
4. Same fragment restrains
{C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17,
C18, C19, C20, C21} sigma for 1-2: 0.02, 1-3: 0.04
as in
{C101, C102, C103, C104, C105, C106, C107, C108, C109, C110, C111, C112, C113,
C114, C115, C116, C117, C118, C119, C120, C121}
5. Others
 Sof(C101)=Sof(H101)=Sof(C102)=Sof(H102)=Sof(C103)=Sof(H103)=Sof(C104)=
 Sof(H104)=Sof(C105)=Sof(C106)=Sof(H10A)=Sof(H10B)=Sof(C107)=Sof(H10C)=
 Sof(H10D)=Sof(C108)=Sof(C109)=Sof(C110)=Sof(H110)=Sof(C111)=Sof(H111)=
 Sof(C112)=Sof(H112)=Sof(C113)=Sof(C114)=Sof(H114)=Sof(C115)=Sof(C116)=
 Sof(H116)=Sof(C117)=Sof(C118)=Sof(C119)=Sof(H119)=Sof(C120)=Sof(H12A)=
 Sof(H12B)=Sof(H12C)=Sof(C121)=Sof(H12D)=Sof(H12E)=Sof(H12F)=1-FVAR(1)
 Sof(C1)=Sof(H1)=Sof(C2)=Sof(H2)=Sof(C3)=Sof(H3)=Sof(C4)=Sof(H4)=Sof(C5)=
 Sof(C6)=Sof(H6A)=Sof(H6B)=Sof(C7)=Sof(H7A)=Sof(H7B)=Sof(C8)=Sof(C9)=Sof(C10)=
 Sof(H10)=Sof(C11)=Sof(H11)=Sof(C12)=Sof(H12)=Sof(C13)=Sof(C14)=Sof(H14)=
 Sof(C15)=Sof(C16)=Sof(H16)=Sof(C17)=Sof(C18)=Sof(C19)=Sof(H19)=Sof(C20)=
 Sof(H20A)=Sof(H20B)=Sof(H20C)=Sof(C21)=Sof(H21A)=Sof(H21B)=Sof(H21C)=FVAR(1)
6.a Ternary CH refined with riding coordinates:
 C19(H19), C119(H119), C40(H40)
6.b Secondary CH2 refined with riding coordinates:
 C6(H6A,H6B), C7(H7A,H7B), C106(H10A,H10B), C107(H10C,H10D), C27(H27A,H27B),
 C28(H28A,H28B)
6.c Aromatic/amide H refined with riding coordinates:
 C1(H1), C2(H2), C3(H3), C4(H4), C10(H10), C11(H11), C12(H12), C14(H14),
 C16(H16), C101(H101), C102(H102), C103(H103), C104(H104), C110(H110),
 C111(H111), C112(H112), C114(H114), C116(H116), C22(H22), C23(H23), C24(H24),
 C25(H25), C31(H31), C32(H32), C33(H33), C35(H35), C37(H37)
6.d Idealised Me refined as rotating group:
 C20(H20A,H20B,H20C), C21(H21A,H21B,H21C), C120(H12A,H12B,H12C), C121(H12D,
 H12E,H12F), C41(H41A,H41B,H41C), C42(H42A,H42B,H42C)
;
_shelx_res_checksum              36482
_olex2_exptl_crystal_mounting_method loop
_olex2_submission_special_instructions 'No special instructions were received'