Pentane 2/?,4/? -2,4-Pentanediol

The Polyurethane Polymer of 3,3-Dinitro-l,5-Pentane Diisocyanate and 5,5,5-Trinitro-1,2-Pentanediol. /... 

The Postnitrated Polyurethane Polymer of 3,3-Din itro-1 -Pentane Diisocyanate and 3-Nitro-3-Aza-1,5-Pentanediol. 

Reduction of diketones such as pentane-2,4-dione using (RfBiNAP-RuCF under hydrogen (75 100 atm) gives the corresponding diol, in this case (R),(R)-2,4-pentanediol with an excellent diastereomer ratio (98 %) and optical purity (>99 %)[48]. 

Figure 7. Time-conversion plot for 1,5-pentanediol initiated preparation of polypropylene ether) diol in pentane (propylene oxide/pentane wt ratio = 3) with Zns[Co(CN)6]2 glyme ...

SYNS 2,4-DIHYDROXY-2-METHYLPENTANE DIOLANE 1,2-HEXANEDIOL ISOL 2-METHYL PENTANE-2,4-DIOL 2-METHYL-2.4-PENTANEDIOL PINAKON a,a,a -TRIMETHYLTRLMETHYLENE GLYCOL... 

METHYLPENTANE see MNI500 2-METHYL PENTANE-2,4-DIOL see HFP875 2-METHYL-2,4-PENTANEDIOL see HFP875 2-METHYLPENTANOL-l see AOK750 2-METHYL-4-PENTANOL see MKW 600... 

The Polyurethene Polymer of 3,3-Dinitro-1,5-Pentane Diisocyanate end 2,2,4,4-Tetranitro-1,5-Pentanediol. 

C6H13N02 1 -nttro-4-methyt pentane. .. 19.300 131.123 2 9042 C6H1402 DL-threo-4-methyl-2,3-pentanediol 6464-40-0 24.129 131.489 2... 

In the case of 1,3-butanediol, the remaining diol had slight optical activity. This showed (S)-configuration at 27% opticd purity. This was determined by comparison of optical rotation with a reference (6). The yeasts could differentiate the (R)- and (S)-alcohol and oxidize the (R)-dcohol predominantly. With 1,4-pentanediol, the yeasts preferred the primary hydroxy group to the secondary one and gave pentane-1,4-olide and its lactol at 6.3% yield. The afforded lactone showed slight optical activity and was the (R)-form at 5% optical purity. This was determined by comparison of optical rotation with a reference (7). This showed that the yeasts preferred (R)-l,4-pentanediol as the substrate. 

Oxidation of Prochiral Diol. The oxidation of prochiral diol 3-methyl-1,5-pentanediol did not give the corresponding -hydroxy aldehyde but gave the corresponding lactol at 22% yield. To determine stereochemistry of the lactol, this was chemically oxidized by Ag20 and afforded 3-(R)-methyl-pentan-l,5-olide at 38% optical purity. (Figure 9). This was determined by comparison of optical rotation with a reference (70). 

Novoldiamine. N ,N -Diethyl-1,4-penta nedia mine I -diethylamino-4-aminopentane 4-amino-I -diethylamino-pentane 2-amino-5-diethylammopentane 8-diethylamino-a -meth y Ibuty] amine 6 -diethyl aminoisopent ylamine. C -HjjNj mol wt 158.28. C 68.29%, H 14.01%, N 17.70%. Prepd commercially from 2-diethylaminoethano and ethyl acetoacetate. 2-ChlorOtriethylamine (formed hy the action of thionyl chloride on the alcohol) is condensed with the sodium derivative of ethyl acetoacetate to yield an Intermediate ester, which is hydrolyzed and decar boxylated to novo ketone (5 -diethylamino -2-pentanone). This is hydrogenated in the presence of ammonia to yield novoldiamine. Several other prepns, i.e, from 1,4-pentanediol and diethylamine Kyrides, U.S. pat. 2,365,825 (1944 to Monsanto). Purification procedure Jones, U.S. pat. 2,400,934 (1946 to Lilly). 

Isobutyric acid, ester with 2,2,4-trimethyl-1,3-pentane-diol. Chissocizer CS 12 CS 12 EINECS 246-771-9 Isobutyraldehyde Tishchenko trimer Isobutyric acid, ester with 2,2,4-trimethyl-1,3-pentanediol 1,3-Pentanediol, 2,2,4-trimethyl-, monoisobutyrate Propanoic acid, 2-melhyl-, monoester with 2,2,4-trimethyl-1,3-pentanediol Texanol Texanol Ester-Alcohol 2,2,4-Trimethyl-1,3-pentanediol monoisobutyrate. Liquid bp = 244° d = 0.9500. Chisso Corp. Eastman Chem. Co. 

Treatment of a diol with chlorodiphenylphosphine in the presence of triethylainine or pyridine leads to diphosphinites. By this easy method, (S,S)-1,2-bis(diphenylphosphinoxy)cyclohexane (CHDPPO, 59) was obtained from (S,S)-l,2-cyclohexanediol (Section 4.1.2)23 58 and (5,S)-2,4-bis(diphenylphosphinoxy)pentane [(S,S)-BDPOP, (S.SV60] from (S,S)-2,4-pentanediol (Section 4.I.2.)59. In ref 59, the synthesis is described in detail from the beginning, i.e., the asymmetric synthesis of the diol by catalytic reduction of the diketone with Raney nickel modified with tartaric acid/sodium bromide. 

Unlike the reaction catalysed by [RuCl2(PPh3) (5)-biphemp ], a dimeric complex has been reported to play a direct role in the enantioselective conversion of acetylacetone to (i )-(/2)-2,4-pentanediol with the catalyst precursor [(BDPzP)(DMSO)Ru(p-C1)3RuC1(BDPBzP)] (BDPBzP = (R)-(R)-3-benzyl-2,4-bis(diphenylphosphino)pentane) (MeOH, 50 bar Hj, 50 °C) [68]. The binuclear complex [(BDPzP)C1(ti2-H2)Ru(h-H)2Ru(ti2-H2)(BDPBzP)] was actually detected by high-pressure NMR spectroscopy as the only ruthenium compound in the course of the catalytic reaction yielding (/ )-(/ )-2,4-pentanediol (Scheme 15). 

Synonyms/Trade Names 2,4-Dihydroxy-2-methylpentane 2-Methyl-2,4-pentanediol 4-Methyl-2,4-pentanediol 2-Methyl pentane-2,4-diol ... 

This is in contrast to the situation in 1,5-pentanediol where intramolecular hydrogen bonding is less favored by the molecular structure. These results can provide an estimate of the free energy of the formation of the relevant, structures. In a more realistic approximation, however, the anisotropic scattering in the alcohols can be-described by a distribution of the local aniso- tropy rather than to well defined structures with an equally well defined anisotropy. Dilution eriments with CHCl have confirmed this picture and have shown that the reduced intensity of 2,4-pentane-diol decreases with the solvent content. We can understand this, as the solvent will probably decrease the ratio of intermolecular to intramolecular hydrogen bonding in the same manner, as the increase of the temperature does. 

Kinetic Studies. All chemicals used were rigorously purified. Propylene oxide and 1,5-pentanediol were vacuum distilled from anhydrous calcium siolfate. n-Pentane, n-hexane, and tetra-hydrofuran were vacuum distilled from calcium hydride. 

Pentanediol, 2,2/4>trimethyl, monoisobutyrate. See 2,2/4-Trimethyl-1,3-pen-tanediol isobutyrate 1,5-Pentanedione. SeeGlutaral Pentane, dodecafluoro-. See Peifluoropentane 2-Pentanol, 4-methyl-. See Methyl amyl alcohol... 

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