82378-96-9Relevant academic research and scientific papers
Desymmetrization of Symmetrical Triarylcarbinols: Synthesis of 7-Arylfluorenes and a C 2 -Symmetric Chiral BIFOL Phosphoric Acid
Someshwar, Nagamalla,Karthick, Muthupandi,Ramanathan, Chinnasamy Ramaraj
, p. 2253 - 2261 (2017)
A simple and an efficient method for the synthesis of 7-arylfluorenes by intramolecular cyclization of the corresponding triarylcarbinols in the presence of the solid-acid catalyst NaHSO 4 /SiO 2 has been developed. By using this method, a new chiral diol with a C 2 -symmetric bisfluorenyl unit, 7,7′-diphenyl-7 H,7′ H -5,5′-bibenzo[ c ]fluorene-6,6′-diol (BIFOL), having central chirality was synthesized in an optically active form from (S)-(-)-BINOL-3,3′-dicarboxylic acid. The absolute configuration of the chiral bisfluorene derivative BIFOL was ascertained by single-crystal X-ray analysis. Furthermore, a new chiral phosphoric acid was synthesized from BIFOL and evaluated for enantioselective transfer hydrogenation.
NaHSO4/SiO2catalyzed generation of: o -quinone/ o -thioquinone methides: synthesis of arylxanthenes/ arylthioxanthenes via oxa-6π-electrocyclization
Anthony, Savarimuthu Philip,Karthick, Muthupandi,Konikkara Abi, Edwin,Ramanathan, Chinnasamy Ramaraj,Someshwar, Nagamalla
supporting information, p. 8653 - 8667 (2020/11/17)
ortho-Quinone methides, very reactive transient intermediates, are utilized successfully in synthesizing complex organic molecules of natural and biological significance. Among several synthetic protocols, the acid catalyzed generation of ortho-quinone me
INTERMOLECULAR CYCLIZATION OF o-FUCHSONES
Pisova, Milena,Soucek, Milan
, p. 838 - 842 (2007/10/02)
o-Fuchsones formed by dehydrohalogenation of o-hydroxyaryl(diaryl)methyl chlorides with tertiary amines undergo a cyclization to eight-membered dimers of the type head to tail.The dimerization reaction is catalyzed by tertiary amines hydrochlorides involving very likely triarylmethyl cation as intermediates.
