Mixed 4-Methyl-2-Pentenes

THF (5 g) mixed with 0.1 ml 10 NHC1 and added slowly to 5 g of titanium isopropoxide with fast stirring. This sol was then mixed with a 10 wt% solution of triethoxysilane capped PF or PEK in THF. The final solution was cast into poly(4-methyl-pentene) Petri dishes and covered for drying and curing at 60 °C for 24 h. Films were then removed and annealed at 200 °C for 15 min... 

Two approaches for the synthesis of allyl(alkyl)- and allyl(aryl)tin halides are thermolysis of halo(alkyl)tin ethers derived from tertiary homoallylic alcohols, and transmetalation of other allylstannanes. For example, dibutyl(-2-propenyl)tin chloride has been prepared by healing dibutyl(di-2-propenyl)stannane with dibutyltin dichloride42, and by thermolysis of mixtures of 2,3-dimethyl-5-hexen-3-ol or 2-methyl-4-penten-2-ol and tetrabutyl-l,3-dichlorodistannox-ane39. Alternatively dibutyltin dichloride and (dibutyl)(dimethoxy)tin were mixed to provide (dibutyl)(methoxy)tin chloride which was heated with 2,2,3-trimethyl-5-hexen-3-ol40. 

Liu and Zhong introduced a number of QSPR models based on molecular connectivity indices [151, 152], In a first iteration, the researchers developed polymer-dependent correlations descriptors were calculated for a set of solvents and models were developed per polymer type [151], Polymer classes under consideration were polystyrene, polyethylene, poly-1-butene, poly-l-pentene, poly(4-methyl-l-pentene), polydimethylsiloxane, and polyisobutylene. As the authors fail to provide any validation for their models, it is difficult to asses their predictive power. In a subsequent iteration and general expansion of this study, mixed and therefore more general models based on the calculated connectivity indices of both solvent and polymers were developed. While it is unclear from the paper which polymer representation was used for the calculation of the connectivity indices, the best regression model (eight parameter model) yields only acceptable predictive power (R = 0.77, = 0.77, s = 34.47 for the training set, R = 0.75... 

When two polymeric systems are mixed together in a solvent and are spin-coated onto a substrate, phase separation sometimes occurs, as described for the application of poly (2-methyl-1-pentene sulfone) as a dissolution inhibitor for a Novolak resin (4). There are two ways to improve the compatibility of polymer mixtures in addition to using a proper solvent modification of one or both components. The miscibility of poly(olefin sulfones) with Novolak resins is reported to be marginal. To improve miscibility, Fahrenholtz and Kwei prepared several alkyl-substituted phenol-formaldehyde Novolak resins (including 2-n-propylphenol, 2-r-butylphenol, 2-sec-butylphenol, and 2-phenylphenol). They discussed the compatibility in terms of increased specific interactions such as formation of hydrogen bonds between unlike polymers and decreased specific interactions by a bulky substituent, and also in terms of "polarity matches" (18). In these studies, 2-ethoxyethyl acetate was used as a solvent (4,18). Formation of charge transfer complexes between the Novolak resins and the poly (olefin sulfones) is also reported (6). 

Formulation of Resist Solutions. Forty grams of a Novolak resin was mixed with 10 g of the photoactive compound, and dissolved in 100 g of bis-2-methoxy-ethylether. After wafers were spin-coated, the samples were immediately placed on a hot plate at 82 C for 14 min. The formulation procedure of a composite resist of poly (2-methyl-1-pentene sulfone) in the Novolak resin is as follows the polysulfone was mixed with the resin (13 wt% solid), and then dissolved in 2-methoxyethyl acetate the films were spin-coated onto silicon wafers, and then baked at 100°C for 20 min prior to electron beam exposure. 

For further enhancement of electron beam sensitivity, the chlorinated Novolak resin was studied using poly (2-methyl-1-pentene sulfone) as a dissolution inhibitor. The chlorinated Novolak resin mixed well with the polysulfone, and there was no phase separation observed when the films were spin-coated. With 13 wt% of the polysulfone, the chlorinated Novolak resist cast from a cellosolve acetate solution yielded fully developed images with R/Ra = 9.2 after exposure to 2 / 2. It gave fully developed images with R/R0 = 3.2 at a dose of 1 / 2, as shown in Figure 3. There are some problems with this resist system some cracking of the developed resist images... 

The CHDs formed by intramolecular addition often eliminate water to give another of,)6-unsaturated ketone. For mesityl oxide (4-methyl-3-pentene-2-one), 22b, the influence of the reaction conditions on the product distribution was examined in detail [96]. Mixtures of four dimeric species were observed, resulting from initial 4,4 -coupling (24b-d), or from mixed 2,4 -coupling, 24a. Pinacol formation (2,2 -coupling) was not observed [Eq. (6)]. 

To a clean dry test tube at the desired temperature, calculated amounts of methyl chloride, 2,4,4-trimethyl-1 -pentene, n-nonane and the alkylaluminum compound were added and the test tube was stoppered with a rubber septum cap. The content of the test tube was mixed by shaking and the calculated amount of f-butyl chloride in methyl chloride solvent was rapidly added with a syringe. After 25 min the reaction was terminated by slow addition of prechilled methanol. During termination the septum cap was removed to prevent pressure build-up due to the formation of gaseous products. The tube was removed from the drybox and the solvent was slowly evaporated. To facilitate the separation of the organic products from the aluminum oxide residues a saturated aqueous sodium-potassium tartrate solution was slowly added at 0° C. On adding excess water, the aluminum oxide-tartrate complex can be dissolved to yield well separated aqueous and organic layers. The... 

A less general method involves transfer of a chiral group from the cuprate to the enone. The chiral Gilman reagent [R 2CuLi, R = (R)-2-(l-dimethylamino)phenyl] reacted with (4 )-methyl-3-penten-2-one (473) to give 474 in 30% yield and 80% ee. 33 Reaction of the mixed cuprate [ThR CuLi where Th = 2-thienyl and R = (R)-2-(l-dimethylamino)phenyl] gave 474 in 70% yield (82% ee). 3... 

Such a-olefins as (+)- S)-3-methyl-l-pentene, (—)(S)-4-(methyl-l-hexene, and (+ )(S)-5-methyl-heptene have been polymerized with a titanium trichlo-ride/tri-isobutylaluminum catalyst without solvents. From the product mix, by solvent extraction crystalline and amorphous fractions were isolated. Both forms... 

Semicrystalline polyolefin blends were prepared by mixing two different random copolymers of propene with 4-lOC alpha-olefin at a ratio from 1 3-1 1. The first copolymer contained 1-10 wt% of C4 io alpha-olefin (1-butene, 1-pentene, 1-hexene, 1-octene, and 4-methyl-1-pentene), whereas the second 15 0 wt% of the same comonomer. The mixing was carried out in reactors, polymerizing the monomers in the presence of stereospecific catalysts supports on active magnesium dihalides, in at least two sequential stages. The resulting R-TPOs showed limited... 

When 3-methyl-2-pentanol is mixed with acid and heated, the same three products are produced as in a reaction with 3-methyl-3-pentanol, plus there is an additional product, 3-methyl-1-pentene. 

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