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Spiro nonanes, 1,6-dioxa

Bromo-2-thioaryloxy-3-methylcyclohexen-l-one, 2a, is an achiral compound. Its conformation can be fixed in a chiral twisted form in the solid state, but it forms racemic crystals, and hence the solid-state reaction produces a racemic mixture of (—) and (+ )3a. A method for achieving an enantioselective reaction is to form an inclusion complex with a chiral host compound, (— )-(R,R)-( — )-fran.s-2,3-bis(hydroxy diphenyl methyl)-1,4-dioxa spiro-[4,4]nonane, ( — )-4. In a typical experiment, a benzene (5 mL) and hexane (5 mL) solution of (— )-4 and 2a left at room temperature for 24 h gave a 1 1 inclusion compound of (-)-2a and 4 as colorless crystals [38]. [Pg.405]

Dioxa-spiro[4.4 nonan 6-Brom-E14a/1, 221 (Keton/Diol/Br2)... [Pg.393]

Dioxa-spiro 4.4 nonan 3,8-Bis-[chlormethyl]-l,6-dioxo- E19a, 666 (Dicarbonsaure + En/Lac-ton-Bildung)... [Pg.609]

Dioxa-spiro 4.4 nonan 4-Oxo-2-phenyl- E14a/1, 719 (HO-CRj-COOH + R-CHO)... [Pg.1141]

See other pages where Spiro nonanes, 1,6-dioxa is mentioned: [Pg.67]    [Pg.415]    [Pg.1147]    [Pg.553]    [Pg.378]    [Pg.378]    [Pg.406]    [Pg.406]    [Pg.418]    [Pg.515]    [Pg.531]    [Pg.665]    [Pg.916]    [Pg.1006]    [Pg.1145]    [Pg.405]    [Pg.53]   
See also in sourсe #XX -- [ Pg.278 , Pg.278 ]



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Spiro nonane

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