Uses of the Cresols

4-chloro-3-methylphenol and as the intermediate 3-methyl-6-tert-butylphenol for the synthesis of the nitro musk, musk ambrette (2,4-dinitro-3-methyl -6-tert-butylanisole). The most widely used cresol, 4-methylphenol, is an intermediate by reaction with isobutylene for the antioxidant BHT (2,6-di-tert-butyl-4-methylphenol), and for 4-methylphenyl methyl ether a perfumery chemical which is also used as an intermediate for its oxidation product, anisaldehyde (4-methoxybenzaldehyde), another important perfumery chemical. 

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Exposure characteristics for NPR with use of the cresol novolac are shown in Figure 3. This NPR contains 12% PMPS agaist the resin weight. Bowden and his coworkers showed that post-exposure baking increases the sensitivity of NPR(10). However, with the present NPR, the post-exposure baking does not remarkably affect sensitivity. An example of the fine pattern for this NPR as obtained by electron beam delineation is shown in Figure 4. 

Cresol kre- s61 [ISV, irreg. fi. cresote] (ca. 1869) (hydroxytoluene, methylphenol) n. H3CC6H4OH. An important family of coal-tar derivatives, occurring in ortho, meta, and para isomers, and used in the production of phenol-formaldehyde resins and tricresyl phosphate, an important plasticizer for PVC. Three cresols are possible, namely (a) o-cresol, mp 30°C bp, 19rC (b) m-cresol, mp 4°C bp, 205°C (c) p-cresol, mp 36°C bp, 201°C, and these are found together in the crude cresylic acid from coal tar. The main use of the cresols is in the manufacture of cresol-formaldehyde resins, and cresylic acid, rich in the meta isomer, is usually chosen for this purpose. 

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