Resorcinol, 5-Methyl

Al Preparation of 7-Hydroxy-4,8-Dimethy/coumarin Chilled ethyl acetoacetate (157 ml, 1.20 mols) followed by 2-methyl-resorcinol (130 g, 1.04 mols) was dissolved in well-stirred concentrated sulfuric acid (600 ml) at such a rate as to keep the temperature below 10°C (ice bath). The stirred solution was allowed to warm gradually and after 3 hours was added to water (ca 8 liters) with mechanical stirring. The product was collected, washed twice with water, and dried at 70° to 80°C until the first sign of darkening. Yield 191.3 g (95.4%). Recrystallization from aqueous ethanol gave 7-hydroxy-4,8-dimethylcoumarin as colorless needles, MP 260.5° to 261°C. In dilute sodium hydroxide, the compound gives a yellow solution which exhibits blue fluorescence. 

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... 

The thermal properties of the 2-methyl resorcinol, poly(hydroxystyrene) and the PDMSX copolymers prepared with them are shown in Table HI. For both copolymer systems using 4400 g/mole PDMSX blocks there was no significant... 

Transmission election microscopy (TEM) was used to further explore the microstructure in each of the three copolymer systems. The 2-methyl resorcinol-PDMSX copolymer was expected to show the greatest degree of microphase... 

Auger depth profiling results of (a) 2-methyl resorcinol-PDMSX, (b) o-cresol novolac-PDMSX, and (c) poly(hydroxy-styrene)-PDMSX. 

Optimization of the deep-UV exposure and aqueous TMAH development steps for all three parent phenolic resins formulate with the diazonaphthoquinone dissolution inhibitor resulted in the resolution of positive tone 0.75 pm L/S patterns at a dose of 156, 195 and 118 mJ/cm2 for the o-cresol, 2-methyl resorcinol and PHS materials, respectively (Table V). The copolymers prepared with a 4400 g/mole PDMSX resulted in TMAH soluble films at >11 wt % silicon however, the feature quality was extremely poor in each case. Figure 6 shows an SEM photomicrograph of a 2-methyl resorcinol-PDMSX copolymer using (a) 20 and (b)... 

Figure 6 Scanning electron microscope photograph of coded 0.75 pm line-space images obtained with the 2-methyl resorcinol-PDMSX copolymer ( = 4400 g/mole) containing (a) 20 wt % and (b) 30 wt % diazonaphthoquinone dissolution inhibitor.

The principal red couplers are 3-aminophenol [591-27-5], 5-amino-2-methyl-phenol [2835-95-2], and 1-naphthol [90-15-3]. Yellow-green couplers include resorcinol [108-46-3], 4-chlororesorcinol 195-88-5, benzodioxoles, and 2-methyl-resorcinol [608-25-3] and its derivatives. The importance of the yellow-green couplers lies in the broad-band absorption of the dyes produced, which makes natural-looking hair shades possible. Table 5.4 lists a range of colors obtained by reaction of primary intermediates with different couplers. 

A) Preparation of 7-Hydroxy-4,8-Dimethylcoumarin Chilled ethyl acetoacetate (157 ml, 1.20 mols) followed by 2-methyl-resorcinol (130 g,... 

Resorcinol (and some 2-substituted derivatives such as 2-methyl resorcinol and phloroglucinol) react with aldehydes different from formaldehyde to form cyclic tetramers II, having the same [l4]metacyclophane skeleton.5 Among four possible stereoisomers, the rccc, rctt, and less frequently the rcct isomers are usually available. Various names have been used for these tetramers, which will be called resorcarenes6 in this review. 

Preparation by treating o-toluic acid with 2-methyl-resorcinol in the presence of Zeolite-H-beta (previously activated at 400°), in refluxing p-chlorotolnene or n-decane for 2-3 h (with water removal) (74%) [53,196]. 

JJ 2-methyl-resorcinol with boron trifluoride-ethyl ether... 

Preparation by reaction of acetic acid on 2-methyl-resorcinol with zinc chloride (Nencki reaction) (59%) [2671]. 

CH3 j yCOCH2C1 Preparation by reaction of chloroacetonitrile with y 2-methyl-resorcinol (72%) (Hoesch reaction) [4628]. 

Preparation by reaction of acetic anhydride with 2-methyl-resorcinol,... 

Paternostre, L., Damman, P, Dosiere, M. Polymorphism and crystal morphology of poly (ethylene oxide)-2-methyl resorcinol supramolecular complexes. Macromolecules, 32,153-161 (1999). 

The addition of calcium and EDTA reduced the toxicity, at least by 10%, of 2,6-dini-trocresol, 2,4-dinitrophenol, 2,6-dinitrophenol, 2,6-dinitrotoluene, 2-methyl resorcinol, 3-phenoxybenzoate, 2,4-dinitrocresol, the detergent CTAB, the antibiotic Neomycin, p-hydroxybenzoate, pentachlorophenol, salicylic acid, and trichloroethylene. 

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