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In other projects Wikidata item; ... for p-Xylene/Butanone [6] P = 760 mm Hg BP Temp. °C ... Spectrum NIST: Major absorption bands
p-Xylene (para-xylene) is an aromatic hydrocarbon. It is one of the three isomers of dimethylbenzene known collectively as xylenes . The p- stands for para- , indicating that the two methyl groups in p -xylene occupy the diametrically opposite substituent positions 1 and 4.
[3] [7] Commercial or laboratory-grade xylene produced usually contains about 40–65% of m-xylene and up to 20% each of o-xylene, p-xylene and ethylbenzene. [8] [9] [10] The ratio of isomers can be shifted to favor the highly valued p-xylene via the patented UOP-Isomar process [11] or by transalkylation of xylene with
Despite the observed chemistry of para-xylylene (i.e. its rapid polymerization to poly-p-xylylene), which suggests the compound exists as a diradical, physical evidence unanimously concludes that the lowest electronic state of p-xylylene is a closed shell singlet. Additionally, several computational methods confirm this assignment. [13]
p-xylene (data page) Vapor-liquid Equilibrium for Aniline/Water [6] P = 745 mm Hg BP Temp. °C % by mole water liquid vapor 98.5: ... Other NMR data MS; Masses of
The mass spectrum of methylbromide has two prominent peaks of equal intensity at m/z 94 (M) and 96 (M+2) and then two more at 79 and 81 belonging to the bromine fragment. Even when compounds only contain elements with less intense isotope peaks ( carbon or oxygen ), the distribution of these peaks can be used to assign the spectrum to the ...
α,α'-dimethoxy-p-xylene. A similar synthesis for parylene N uses the precursor α,α'-dimethoxy-p-xylene. [28] The methoxy group H 3 CO − is the leaving group; while it condenses in the deposition chamber, it does not interfere with the deposition of the polymer. [23] This precursor is much less expensive than [2.2]para-cyclophane.
multiple broad peaks C─O alcohols: primary 1040–1060 strong, broad secondary ~1100 strong tertiary 1150–1200 medium phenols any 1200 ethers aliphatic 1120 aromatic 1220–1260 carboxylic acids any 1250–1300 esters any 1100–1300 two bands (distinct from ketones, which do not possess a C─O bond) C─N aliphatic amines any 1020–1220