Preference for the Diels–Alder addition of dienes <i>syn</i> to the O atom in cross-conjugated spirocyclic cyclohexadienones
Gallucci, Judith C.; Tamura, Yukiko; Paquette, Leo A.; Acta Crystallographica Section C 60 (2004) o656–o658; doi:10.1107/S0108270104015951

data_2014149
_publ_section_title
;
 Preference for the Diels--Alder addition of dienes <i>syn</i> to the O
 atom in cross-conjugated spirocyclic cyclohexadienones
;
_journal_issue                   9
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o656
_journal_page_last               o658
_journal_paper_doi               10.1107/S0108270104015951
_journal_volume                  60
_journal_year                    2004
_chemical_formula_iupac          'C28 H22 O3'
_chemical_formula_moiety         'C28 H22 O3'
_chemical_formula_sum            'C28 H22 O3'
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_chemical_name_systematic
;
rel-(1R,4aS,9R,9aS,10S)-4a,9,9a,10-tetrahydro-9,10-diphenyl-
spiro[9,10-epoxyanthracene-1(4H),2'-oxetane]-4-one
;
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_diffrn_measurement_method       '\f and \w scans'
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_exptl_crystal_colour            'pale yellow'
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_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'rectangular chunk'
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_refine_ls_structure_factor_coef Fsqd
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'w=1/[\s^2^(Fo^2^)+(0.0627P)^2^+0.2487P] where P=(Fo^2^+2Fc^2^)/3'
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