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Ethers, cyclic from diols

Condensations Highly atom economical since small molecules of water or alcohol are liberated Atom economy increases as the molecular weights of the combining fragments increases For cyclization reactions such as the Dieckmann condensation and the synthesis of cyclic ethers from straight chain diols the atom economy increases with increasing ring size... [Pg.98]

Dehydration ofl,4-diols. Nafion-H can be used for dehydration of 1,4-diols to tetrahydrofuranes (90-95% yield). Yields of cyclic ethers from 1,2-, 1,5-, and 1,6-diols are lower (50-85%).5... [Pg.520]

Miscellaneous Reactions. - p-Toluenesulfonaraide undergoes Mitsunobu-type reactions in the presence of alcohols and cyanomethylenetriphenyl-phos-phorane (56) to give predominantly mono-N-alkylation products. This reaction has also been applied to the synthesis of cyclic ethers from diols and cyclic amines from amino alcohols and to carbon-carbon bond formation. Examples of cyclic amine synthesis include that of (+)-a-skytanthine (57). A comparative study of the reactions of active methine compounds (58) as nucleophiles using... [Pg.246]

Cyclic ethers from diol monotosylates 236. HOv. ..CH2CH2OTS... [Pg.77]

Toluenesulfonic acid Cyclic ethers from diols with 1,2-arylthio group migration Stereospecific ring closure... [Pg.65]

Cation exchange resin Cyclic ethers from diols... [Pg.482]

Benzenesulfonyl chloride pyridine Cyclic ethers from diols s. 7, 355 stereospecific ring closure, tetrahydrofurans, C OH also with f. reagents, and from dimesylates preferably with NaOH, s. M. L. Mihailovid, S. Gojkovic, and 2. Cekovic, Soc. Perkin I 1972, 2460... [Pg.73]

Dehydration of alcohols s. 27, 941 oxido compds. and cyclic ethers from diols cf. Am. Soc. 96, 4604 (1974)... [Pg.528]

Lithium tetrahydridoaluminate boron fluoride Diols and cyclic ethers from lactones... [Pg.26]

See other pages where Ethers, cyclic from diols is mentioned: [Pg.99]    [Pg.205]    [Pg.247]    [Pg.1223]    [Pg.75]    [Pg.345]    [Pg.78]    [Pg.78]    [Pg.374]    [Pg.366]    [Pg.84]    [Pg.403]    [Pg.104]    [Pg.105]    [Pg.483]    [Pg.373]    [Pg.373]    [Pg.260]    [Pg.318]    [Pg.260]    [Pg.81]    [Pg.380]    [Pg.378]    [Pg.310]    [Pg.113]    [Pg.117]    [Pg.464]    [Pg.464]    [Pg.161]    [Pg.82]    [Pg.83]    [Pg.340]    [Pg.89]    [Pg.78]   
See also in sourсe #XX -- [ Pg.637 ]

See also in sourсe #XX -- [ Pg.637 ]

See also in sourсe #XX -- [ Pg.637 ]

See also in sourсe #XX -- [ Pg.658 ]

See also in sourсe #XX -- [ Pg.625 ]



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Cyclic 1,2-diols

Ethere cyclic

Ethers cyclic

Ethers, cyclic, conversion from diols

From 1,3-diols

From cyclic ethers

From ethers

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