Pyran-3-methanol, tetrahydro

Pullulan, fungal, 372, 382 Pullulanase, 360, 373 purification by chromatography, 283 Pyran-2,6-dimethanol, tetrahydro-, 62 Pyran-2-methanol, tetrahydro-, 62 Pyran-3-methanol, tetrahydro-, 62 Pyranosides, history, 3 Pyrazole, 3-(D-eri/f/iro-l,2,3-trihydroxypro-pyl)-, 163... 

Tetrahydro-2W-pyran-2-methanol Tetrahydro-2/fpyran-2-one Tetrahydro-4/7-pyrari-4-one 1.2.5.6-Tetrahydropyridine... 

H-Pyran-2,4(3H)-dione, 3-acetyl-6-methyl-, monosodium salt. See Sodium dehydroacetate Pyranine. See Solvent green 7 Pyranine cone.. See D C Green No. 8 Pyran-2-methanol, tetrahydro- 2H-Pyran-2-methanol, tetrahydro-. See Tetrahydropyran-2-methanol... 

Tetrahydro-pseudo-ionone. See Tetrahydro-pseudo-ionone Tetrahydropyran-2-carbinol 2-Tetrahydropyranilcarbinol. See Tetra hyd ropy ran-2-methanol Tetrahydropyran-2-methanol CAS 100-72-1 El NECS/ELINCS 202-882-4 Synonyms 2-Hydroxymethyltetrahydropyran 2-Methanol tetrahydropyran 2-Methyloltetrahydro-1,4-pyran Pyran-2-methanol, tetrahydro- 2H-Pyran-2-methanol, tetrahydro-... 

To assess the accuracy of the simulations and the COMPASS force field in these calculations, two organic solvents were studied first. Glycerol was chosen because it is a polyol, in common with the building blocks of cellulose 2-methanol-tetrahydro-pyran (THPMeOH) was chosen because its ring structure is analogous to the repeat unit of cellulose. The calculated densities and solubility parameters are presented in Table 4.1 along with the experimental values. 

Namely, the reaction of 2-thioxothiazolidin-4-one N-hexanoic acid (116) with 2,5-dimethyl-l-phenylpyrrol-3-carboxaldehyde (117) in methanol under the catalytic action of ethylenediamine diacetate (EDDA) yields 5-[(2,5-dimethyl-l-phenylpyrrol-3-yl)methylidene]-2-thioxothiazolidin-4-one N-hexanoic acid (118) in 79% yield. The hydroxamate derivative of 118 is prepared by reacting this compound with 0-(tetrahydro-2H-pyran-2-yl)hydroxylamine followed by treatment with p-toluenesulfonic acid in methanol to afford compound 121 in 60% yield. Esterification of compound 118 is carried out by using methyl iodide in acetonitrile in the presence of sodium carbonate to give compound 120. The 5-(cyclohexyl)methylidene analogue (119) is obtained in 42% yield by direct reaction of compound 116 with cyclohexanecar-boxaldehyde in methanol under the catalytic action of EDDA. 

When the alkoxypalladation of alkenols is carried out in methanol under a carbon monoxide atmosphere, the alkylpalladium intermediate is cleaved to afford methyl 2-(tetrahydro-2//-pyran-2-yl)acetates. Starting from 5-alkenols, the reaction proceeds by a 6-exo closure with total regio-and stereoselectivity. In fact, only the tetrahydro-2//-pyrany derivative is formed, in 74% yield, and the cis-2,6-isomer is the major component of the reaction mixture. This result is due to the more stable 2,6-diequatorial configuration of the substituted tetrahydro-2/7-pyran ring82. 

When a strained bicyclic system cannot be obtained, 1,3-asymmetric induction alone is not effective in the stereoselective preparation of letrahydro-2//-pyrans via conjugate addition. In fact, cyclization of methyl (6/J,7A)-(/s)-7-benzyloxycarbonylamino-7-/cr/-butyldiphenylsilyl-oxy-6-hydroxy-2-heptenoate (7), performed with potassium carbonate in methanol at 20 CC, affords in 75% yield, an equimolar mixture of the diastereomeric tetrahydro-2//-pyrans 8 which can be separated by column chromatography and identified by H NMR90. 

With dialdehydes as enol components, the aldol reaction may be followed by an acetalization event Thus, Hayashi and coworkers [10] established a highly enan-tioselective proHne-catalyzed domino aldol-acetalization of aqueous tetrahydro-2H-pyran-2,6-diol (21) and aldehydes (Scheme 8.7). In this sequence, the intermediate aldolate product 22 is trapped by the additional aldehyde moiety to generate a lactol, which through addition of methanol and acid is converted into the double acetal 23. 

ZaR AR, lS,%aR -Tetrahydro-7-hydroxy-2,2-dimethyl-4,7-methano-l, 3-dioxolo[4,5-c]oxepin-6(4//)-one, Q-10 Tetrahydro-3-hydroxy-5-hydroxymethyl-3-furancarboxylic acid, T-26 2,3,3a, 9a-Tetrahydro-3-hydroxy-6-imino-6/ -furo[2, 3 4,5]oxazolo[3,2-a]-pyrimidine-2-methanol, C-170 Tetrahydro-5-hydroxy-3-methylene-2-furanmethanol, D-629 7,8,9,10-Tetrahydro-8-hydroxy-3-methyl-6,9-epoxy-2ff,6ff-pyrimido[2,l-6]-[l,3]oxazocin-2-one, A-715 Tetrahydro-2-hydroxy-6-methylpyran, H-144 Tetrahydro-2-(hydroxymethyl)pyran, T- ... 

In 2013, Arias et at. [33] investigated the hydroformylation of 3,4-dihydro-2//-pyran (Scheme 1.15). Mainly the 2-formyl product was formed. 3-Formyl-tetrahydropyran and some other side products, such as tetrahydropyran or bis(tetrahydro-2//-pyran-2-yl)methanol, also were formed in much less amounts. Interestingly, no alcohol was found. Addition of PPhg decelerated the reaction. 

A mixture of 2-(2-hydroxy-4-methoxyphenyl)-4-ethylenedioxy-l-cyclohexene-1-methanol, acetic acid, pyrrolidine, toluene, and water refluxed 20 hrs., then the organic layer separated, the aq. layer again refluxed 20 hrs. with fresh toluene, and the product isolated from the combined toluene solns. 6,6a,7,8-tetrahydro-3-methoxy-9H-dibenzo[b,d]pyran-9-one. Y 78%. - Refluxing in aq. acetic acid in the absence of a weak base produced an intractable resin. M. Miyano and C. R. Dorn, J. Org. Chem. 37, 259 (1972). 

Dihydro -5 -methyl- 2(3 H) -furanone (y-valerolactone) Tetrahydro-2H-pyran-2-methanol... 

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