2- Methyl-l-pentyl

For the same reason 1-alkenes, unlike ethylene, react with trialkyl alanes to form practically exclusively the 2-alkyl-l-alkenes. Thus aluminum 2-methyl-l-pentyl, formed from tripropylalane and propene,... 

The hydrodynamic radius is, of course, larger than the water core radius (R ) by the length of the surfactant molecule and any possible layer of the alkane oil phase. Eastoe and colleagues later showed [60] similar linear relationships up to around w = 40 also for analogs of AOT, namely, (a) sodium bis(2-propyl-l-pentyl) sulfosuccinate (analog 2 in Fig. 3.10) and (b) sodium bis(l-ethyl-2-methyl-l-pentyl) sulfosuccinate (analog 5 in Fig. 3.10) obviously, the slopes were slightly different. 

Tri(2-methyl-l-pentyl)borane evolves isohexenes (primarily 2-methyl-2-pentene) and hydrogen when pyrolyzed, forming four boron-containing isomers of formula C6H13BC6H12 (b.p. 98-102° C/16 mm). Isohexyl-boracyclohexane (XLIX) forms 80 % of the product, and 20 % is isohexyl-boracyclopentanes (L). 

Pillai and Pines (84) found that neopentyl alcohol, mixed with 10% by weight of piperidine and passed over alumina prepared from aluminum isopropoxide, yielded 2-methyl-l-butene and 2-methyl-2-butene, in a maximum ratio of 3, and small amounts of 1,1-dimethylcyclo-propane. However, lert-pentyl alcohol yielded these two olefins in a maximum ratio of only 1.4, and none of the cyclopropane was produced (Table VI). Because of these facts a carbonium ion mechanism which is applicable to ferf-pentyl alcohol is not adequate to explain the rearrangement taking place during the dehydration of neopentyl alcohol,... 

Figure 1 Dependence of the selectivity factor (oc)for C,4-C17 alkylbenzenes on the C-number of homologous oA column with Carbowax 20M and MEAB l=n-alkyl-/ l-methyl >2-alkyl-, 2= l-methyl-2-alkyl-/l-ethyl-2-alkyl-, 3s l-ethyl-2-alkyl-/l-propy1-2-alkyl-, 4 l-pro-pyl-2-alkyl-/l-buty1-2-alkyl-t 5=l-butyl-2-alkyl-/l-pentyl-2-alkylbenzene ...

Ethylenediamine and 3-bromo-2-octanone (125) gave 2-methyl-3-pentyl-l,4,5,6-tetrahydropyrazine (126) (EtOH, 20°C — reflux, 3 h 47%).1103 Also other examples.718,1394... 

Cyclopropan 3-Brom-2-isopropyl-2-methyl-1-methylen- IV/ld, 402 Cyclopropen 2-Brom-l-pentyl- E17d, 2708 [ — Br2 (-> En)]... 

Ethoxy-[(l S,2S)-/nzn,s-2-methyl-cyclopentyl]-pentyl- E2ld, 4413 (R2BH + 1 -Penten/H3C — CHO)... 

In the presence of Sn(OTf)2, (5)-l-pentyl-2-[(piperidin-l-yl)methyl]pyrrolidine, and BusSnF, l-(5)-ethyl-l-trimethylsiloxyethene reacts with methyl pyruvate to give the desired adduct in 92 % ee (Eq. 21). Methyl isopropylglyoxylate and methyl phe-nylglyoxylate also react with l-(5)-ethyl-l-trimethylsiloxyethene to give the corresponding 2-substituted malates in good yields and excellent enantioselectivity [36],... 

This sequence transforms acyclic ketones and aldehydes into a-methylene ketones and a-methyl-a,)5-unsaturated ketones and aldehydes It has been illustrated by the synthesis of eucarvone, ( )-nuciferal and ( )-manicone This ring-opening of chlorosiloxycyc-lopropanes with ClSiMea elimination appears to be a practical route to Z or a,)5-ethylenic aldehydes and ketones depending on the stereochemistry of the reactants. For example, conversion in MeOH-NEta at 20°C of the 2-chloro-2-methyl-3-pentyl-l-trimethylsiloxycyclopropanes (derived from the addition of the chloromethylcarbene to the E and Z silyl enol ethers of n-heptanal) leads either to or Z 2-methyl-oct-2-enal (equation 65). ... 

Analogue (3) [39036-48-1]. 5 Hydroxy-8,8 dimethyl-6-(2 methyl-l-oxobutyt) 4-pentyl-2H,8H-benzo[l,2-h 3,4-h ]dipyran-2 one, 9CI... 

Capsicum contains up to 1.5% (usually 0.1-1.0%) pungent principles, composed mainly of capsaicin other pungent alkaloid principles (capsaicinoids) include dihydrocap-saicin, nordihydrocapsaicin, homocapsaicin, and homodihydrocapsaicin, with the last two in minor concentrations. Other constituents present include carotenoids (capsanthin, capsorubin, P-carotene, lutein, zeaxanthin, etc.) ° fats (9-17%), proteins (12-15%), vitamins A, C, and others and a small amount of a volatile oil made up of more than 125 components of which 24 were identified, including 4-methyl-l-pentyl-2-methyl butyrate, 3-methyl-l-pentyl-3-methyl butyrate, and isohexyl isocaproate (jiangsu marsh). ... 

The rate coefficient values available for 2-butyl nitrite, 2-methyl-l-propyl nitrite, 2-methyl-2-propyl nitrite, and 1-pentyl nitrite are given in table VIII-I-12. As mentioned for other alkyl nitrites, the measurements of Audley et al. (1982) might be overestimated. The rate coefficient determinations for the reaction of OH with n-pentyl nitrite of Nielsen et al. (1991) using both relative and absolute methods are in reasonable agreement. 

Diketones are readily transformed to cycHc derivatives, such as cyclopentanones and furans. In this manner, the fragrance dihydrojasmone (3-meth5l-2-pentyl-2-cyclopenten-l-one) is prepared by the base-catalyzed aldol condensation of 2,5-undecanedione. 2,5-Undecanedione is itself prepared from heptanal and methyl vinyl ketone in the presence of thiazoHum salts (329). i7j -Jasmone can be similarly prepared (330,331). 

A commercially important outlet in the fragrance industry is the methyl dihydrojasmonate [24851-98-7] (26) which is made by Michael addition of a malonate to 2-pentyl-2-cyclopenten-l-one [91791 -21 -8] (52) and which is used in perfumery for blossom fragrances, particularly jasmine (see Perfumes). 

Sulfates having alkyl groups from methyl to pentyl have been examined. With methyl as an example, the hydrolysis rate of dimethyl sulfate iacreases with the concentration of the sulfate. Typical rates ia neutral water are first order and are 1.66 x lO " at 25°C and 6.14 x lO " at 35°C (46,47). Rates with alkaH or acid depend on conditions (42,48). Rates for the monomethyl sulfate [512-42-5] are much slower, and are nearly second order ia base. Values of the rate constant ia dilute solution are 6.5 X 10 L/(mol-s) at 100°C and 4.64 X 10 L/(mol-s) at 138°C (44). At 138°C, first-order solvolysis is ca 2% of the total. Hydrolysis of the monoester is markedly promoted by increasing acid strength and it is first order. The rate at 80°C is 3.65 x lO " ... 

Using different mono- and diketones in acetic acid (at room temperature) afforded the following products from benzophenone, 2,2-diphenyl-2//-imid-azo[4,5-/]quinoline from dibenzylketone, the 2-benzyl-imidazo[4,5-/]quino-line and from 2,4-pentanedione, 2-methyl-imidazo[4,5-/]quinoline. Cyclohexanone under reflux gave 2-n-pentyl-, whereas at room temperature it afforded the. s pira[cyclohexane-l,2 ]-(2//)-imidazo[4,5-/]quinoline 108 (R R =(CFl2)5) (86UC527). 

CiiHijNO, 3SS4J-4J-7) see Carboquone 2-(2-aminocarbonyloxy-l-methoxyethyl)-S-methyl-hydroquinone dimethyl ether (CjjHiijNOj 38843-63-9) see Carboquone [6U-[6a,7a,7(iJ )])-3-[[(aminocarbonyl)oxyJmethyl]-7-[[5-carboxy-S-[[(4-methylphenyl)sulfonyl]amino]-l-oxo-pentyl]amino]-7-methoxy-8-oxo-5-thia-l-azabicy-clo[4.2.01oct-2-ene-2-carboxylic acid compd. with A-cyclohexylcyclohexanamine (1 1)... 

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