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Soc."},{"key":"ref20\/cit20","unstructured":"Bis(3,5-diphenylphenyl)phosphoryl chloride was synthesized from (Et2N)PCl2and 3,5-diphenylphenylmagnesium bromide, which was prepared from known aryl bromide."},{"key":"ref20\/cit20a","doi-asserted-by":"crossref","first-page":"3165","DOI":"10.1021\/jo00366a017","volume":"51","author":"Du C. F.","year":"1986","journal-title":"J. Org. Chem."},{"key":"ref21\/cit21","doi-asserted-by":"crossref","first-page":"959","DOI":"10.1021\/cr50011a002","author":"Lappert M. F.","year":"1956","journal-title":"Chem. Rev."},{"key":"ref22\/cit22","unstructured":"Another possibility is a boronic acid impurity in the boroxines, which were prepared by heating the corresponding boronic acids at 120 \u00b0C under 10 mmHg for 12 h. If the boronic acids remain impure, water is generated by forming boroxine in situ. The use of4a, dried at 220 \u00b0C under 0.5 mmHg for 4 h prior to use, however, did not make a significant difference (6aa, 82%, 98% ee; PhCHO, 6%) under the conditions shown in Table2, entry 4. Therefore, this possibility was excluded."},{"key":"ref23\/cit23","doi-asserted-by":"crossref","first-page":"1357","DOI":"10.1039\/p19840001357","author":"Ramage R.","year":"1984","journal-title":"J. Chem. Soc., Perkin Trans. 1"},{"key":"ref24\/cit24","doi-asserted-by":"crossref","first-page":"4736","DOI":"10.1021\/jo991937p","volume":"65","author":"Botta M.","year":"2000","journal-title":"J. Org. 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