Tetrahydrofuran, 2-methyl

Resist solutions of o-cresol novolac-siloxane copolymers were prepared as 15 w/v % solutions of the polymer in 2-methoxyethyl acetate using 20 wt % (based on polymer) of the positive sensitizer. Poly(hydroxystyrene) and 2-methyl resorcinol copolymers were spun into films from 2-methyl tetrahydrofuran. Solutions were filtered through successive 1.0, 0.5 and 0.2 pm filters and stored in... 

DR. SIDERS The data of Beitz and Miller are very interesting but I feel uncertain about their correct interpretation because the measurements were for transfer of an electron from a solvent trap rather than from a molecule. Also, there s lot of scatter in the data, although they do seem to show inversion. Finally, the data were obtained in a 2-methyl-tetrahydrofuran glass at 77°K, which may differ significantly from water at room temperature. 

Figure 18 Cyclic voltammetric responses at different temperatures of ferrocene in a 16 17 1 chloroethane tetrahydrofuran 2-methyl-tetrahydrofuran solution containing LiBF4 (0.6 mol dm 3) as supporting electrolyte, (a) Platinum electrode (b) Tl 1223 ( Tl0.sPbo.s Sr2Ca2Cu306). Scan rate 0.025 V s. Potential values are referred to a pseudo-reference silver wire...

Measured in toluene-d. Complexes with L = 17a, 17c measured in 2-methyl tetrahydrofuran, complexes with L = 17b, 17d measured in cyclohexane. 

Ion pairs do not conduct electricity, but triple ions (M2A+ and MA2) are conductive. Thus, the formation of triple ions is detected by conductimetric measurement. Figure 7.2 shows the log /1-log c relations for LiAsF6 and LiBF6 in 2-methyl-tetrahydrofuran (2-MeTHF) [17]. After passing a minimum, the value of log A increases again with log c, showing that a triple ion formation occurred in the solution. 

The only head-to-head polymer which has been examined for excimer fluorescence is polystyrene 25). Unfortunately, the synthetic route to this polymer leaves a number of stilbene-based structures in the sample, which have a lower-energy singlet state than either PS monomer (285 nm) or excimer (330 nm). Thus, fluorescence from these intrinsic stilbene traps was seen in the spectra of head-to-head PS in pure films and, to a lesser extent, in fluid solution. In the latter, the fluorescence of PS monomer was predominant, and the small amount of stilbene fluorescence was increased when a nonsolvent (methanol or cyclohexane) was added to the 2-methyl-tetrahydrofuran solution. In films of the polymer, stilbene fluorescence was the major spectral band, although some PS excimer fluorescence was also present in the spectrum. No monomer fluorescence at 285 nm was detected from films. Given the impure nature of the head-to-head PS sample, no conclusions on excimer formation in these systems could be drawn. 

Methyl tetrahydrofuran Di-n-propyl ether, isopentane (3 1) Glycerol triacetate Ethanol, methanol (4 1 to 1 1) Ethanol, diethyl ether, isopentane (EPA) (2 5 5) (1 4 4)... 

The popular approach to tetrahydrofurans involves an electrophilic process and the commonly used electrophiles for the cyclization are acids, oxygen, halogen, mercury (see Section 3.11.2.2.9) and selenium. The ionic hydrogenation of furans with excess triethyl-silane in trifluoroacetic acid affords high yields, e.g. 2-methylfuran is reduced to 2-methyl-tetrahydrofuran and 2-ethylfuran to 2-ethyltetrahydrofuran (see Section 3.11.2.5). The synthesis of several dihydro and tetrahydrofurans containing natural products by chirality transfer from carbohydrates has been used successfully for total synthesis, e.g. (-)-nonactic acid. A reasonable yield of 2-alkyltetrahydrofuran was prepared from 4-alkylbut-l-en-4-ol by hydroboration followed by cyclization with p-toluenesulfonic acid. 

Tetrahydrofuran 2-Methyl tetrahydrofuran Dihydropyran Tetrahydropyran Dioxane... 

Further, neroloxide 20 (80MI698) and 2,6,6-trismethyl-2-vinyl-tetrahy-dropyran 21 (80JAFC346), and 2-vinyl-2-methyl-tetrahydrofuran-5-on 22 (80MI698) have been isolated ... 

By using optically active 131 for the complexation, some guest compounds could be resolved. For example, when a solution of (-)-131 (1.3 g) in rac-2-methyl-tetrahydrofuran (132) (5 g) was kept at room temperature for 12 h, a 1 1 inclusion... 

Methyl- tetrahydrofuran-2- -diethylester E2, 359 2-Methyl-tetrahydropyran-2- -diethylester E2, 359 2-Methyl-l,3-thiazol-4-ylmethan- -diethylester XII/1, 445... 

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