Pentole

The benzenetetrols, -pentol, and -hexol do not have trivial names, except for 1,2,3,4-benzenetetrol [642-96-6] which was named apionol in some of the older hterature. The other two benzenetetrol isomers are 1,2,3,5- [634-94-6] and 1,2,4,5-benzenetetrol [636-32-8]. 

Success finally resulted when the inosose ether (20) was converted to its ethylene mercaptal. The crude mercaptal was reduced with nickel, and the crude pentol pentamethyl ether cleaved in the usual manner. 

Pseudo-/ -DL-gi Zopyranose triacetate (36) was prepared by hydroxyla-tion of the enetriol triacetate (32) and converted to the corresponding pentol and pentaacetate. The intermediate 32 was obtained by Diels-Alder reaction (200°C., two days) of rans/ rans-l,4-diacetoxy-l,3-buta-diene with allyl acetate. The double bond was surprisingly inert to the usual additive reagents and not detectable by infrared spectroscopy because of near-symmetry, but it did react with tert-butyl hydroxperoxide to give 36 in about 30% yield (27). 

No hypotheses can be advanced for the sequences involved in the oxidation of cyclohexanepentols which react even more slowly with periodate than does (+)-quercitol. For instance, when the all-trans l 3, 5/2, 4-cyclohexanepentol (33) is oxidized (Figure 6), production of malonaldehyde starts very early and the time curve of periodate reduction indicates a very complex reaction. Nor is it possible to analyze satisfactorily the curves obtained with (1 l)-1, 2, 4/3, 5-cyclohexane-pentol (34) or with dl-1, 2, 3, 4/5-cyclohexanepentol (35) [this is the configuration predicted for the (1 D)-entantiomorph (41)]. 

H-12,3,6a-Ethanylylidene-7,9-methanonaphth[2,3-b]azocine-4,8,9,ll,lla(lH,7H)-pentol, l-Ethyldecahydro-6,10,13-trimethoxy-3-(methoxymethyl)-, lla-Acetate 8-Benzoate 2-Hydroxy-2,2-diphenylacetic Acid (2-Hydro xyethyl)diethylamine 2-Hydro xytriethylamine 2-Isocyanatopropane 2-ME... 

Hydrochloric acid acetic acid nitric acid Pentol Phosphorus pentoxide Potassium hydroxide sodium hydroxide Acetic anhydride... 

Synonyms Cyclopenta-1,3-diene 1,3-Cyclopentadiene EINECS 208-835-4 Pentole R-pentine Pyropentylene. 

Atropine, scopolamine, cyclopentolate Cyclogyl, AK-Pentolate, and others) and tropicamide Mydriacyl, Tropicacyl, and others) are among the antimuscarinic drugs used in ophthalmology. All of these agents are tertiary amines that reach the iris and ciliary body after... 

C-5 epimers of 6,7-didehydro-5,6,5, 6 -tetrahydro-)3,/3-carotene-3,5,3 5, 6 -pentol (15), isolated as minor constituents of a sample of neoxanthin [5, 6 -epoxy-6,7-didehydro-5,6,5, 6 -tetrahydro-j8,j8-carotene-3,5,3 -triol (16)] from Trollius europaeus, may be artefacts. In Sarcina lutea, sarcinaxanthin [2,2 -bis-(4-... 

When solutions of these salts are treated with concentrated hydrochloric acid, green crystals of diaquo-hexaxmnino-pentol-tricobaltic chloride are formed by the breaking of one ol-linkage thus ... 

R,4aR,5R7S,9S,10S,10a R11S,12S)-Octahydro-12-(hydroxymethyl)-2-imino-5,9 7,10a-dimethano-10aH-[1,3]dioxocino[6,5-d]pyrimidine-4,7,10,11,12-pentol, C-11H17N3O8, MW 319.27, [4368-28-9]... 

Tetrodotoxin, an extremely poisonous heterocycle present in Japanese puffer fish (various species of Spheroides), exerts its action by blocking the sodium ion channels in the peripheral nervous system. Chemically it has an adamantane-like structure, namely octahydro-12 - (hydroxymethyl) - 2 - imino-5,7,9,1 Oa-dimethano- 10aH-[ 1,3] -dioxo-cino-[6,5-d]pyrimidine-4,7,10,11,12-pentol. When chemically dehydrated, it rehydrates in dilute acid.73 Methanol, and ammonia, can add similarly. Because 2-amino-1,6-dihydropyrimidine forms the central part... 

In addition to the dG1cNAc-R series of oligosaccharides, the free R would result from elimination of chains with the branched DGal substituted only on carbons-3 and -4 but not on carbon-6, and several oligosaccharides were isolated which are terminated by 0(1 - 6) linked hexane-1, 2, 4, 5, 6-pentols which would have arisen from chains substi-... 

Preparation 150.—y.-Methyl-d-glucoside [1 -Methoxy-pentol-hexan],... 

Preparation 192.—Gluconic Acid (Pentol-hexan acid -j- + +) ... 

Cyclopentolate Pentolate, Cyclogyl, others Induces mydriasis for ophthalmologic procedures... 

Some of these agents are particularly useful in ophthalmology included in this category are homatropine hydrobromide (Isopto homatropine) (a semisynthetic derivative of atropine) cyclo-pentolate hydrochloride (Cyclogyl), and tropicamide (Mydriacyl). These agents are preferred to atropine or scopolamine because of their shorter duration of action. 

---