Intramolecular formal [4+2] cycloaddition of 3-ethoxycyclobutanones and alkenes.
Matsuo, Jun-Ichi; Sasaki, Shun; Hoshikawa, Takaya; Ishibashi, Hiroyuki; Chemical communications (Cambridge, England) 46 (2010) 934–936; doi:10.1039/b919332d

data_7105200
_publ_section_title
;
 Intramolecular formal [4+2] cycloaddition of 3-ethoxycyclobutanones
 and alkenes.
;
_journal_issue                   6
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              934
_journal_page_last               936
_journal_paper_doi               10.1039/b919332d
_journal_volume                  46
_journal_year                    2010
_chemical_formula_moiety         'C23 H26 O2 '
_chemical_formula_sum            'C23 H26 O2'
_chemical_formula_weight         334.46
_space_group_IT_number           33
_symmetry_cell_setting           orthorhombic
_symmetry_Int_Tables_number      33
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 21'
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_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   7.3596(5)
_cell_length_b                   19.161(1)
_cell_length_c                   13.049(1)
_cell_measurement_reflns_used    8669
_cell_measurement_temperature    123.2
_cell_measurement_theta_max      30.5
_cell_measurement_theta_min      3.0
_cell_volume                     1840.1(2)
_computing_cell_refinement       CRYSTALCLEAR
_computing_data_collection       CRYSTALCLEAR
_computing_data_reduction        'teXsan Ver. 1.11'
_computing_publication_material  'teXsan Ver. 1.11'
_computing_structure_refinement  'teXsan Ver. 1.10'
_computing_structure_solution    SHELXS86
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_diffrn_detector_area_resol_mean 14.46
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_diffrn_measured_fraction_theta_max 1.5605
_diffrn_measurement_device_type  'Rigaku/MSC Mercury CCD'
_diffrn_measurement_method       \w
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.7107
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_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       0
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_diffrn_reflns_limit_k_min       0
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_diffrn_reflns_theta_full        30.55
_diffrn_reflns_theta_max         30.55
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_exptl_crystal_colour            Colorless
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_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Prism
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_exptl_crystal_size_max          0.200
_exptl_crystal_size_mid          0.200
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_refine_diff_density_min         -0.10
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_refine_ls_structure_factor_coef F
_refine_ls_weighting_details     'w = 1/[\s^2^(Fo) + 0.00063|Fo|^2^]'
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_cod_original_formula_sum        'C23 H26 O2 '
_cod_database_code               7105200