Ether formula

Simple tropolones also photoisomerize. 7-Tropolone methyl ether (Formula 6) gives the bicyclic photoisomer (Formula 7) on irradiation in aqueous solution (11). In similar fashion the simple a-tropolone methyl... [Pg.325]

The photochemical transformations of simple tropolone methyl ethers can be more complex than simple valence tautomerization. Irradiation of a-tropolone or its methyl ether (Formulas 16a,b) in aqueous solution in quartz vessels gives 4-oxo-2-cyclopentenylacetic acid (Formula 17a) or the methyl ester (Formula 17b) (15,16). [Pg.327]

The reaction does not involve a ketene as originally suggested (15) since irradiation of the methyl ether (Formula 16b) in ethanol gives only the methyl ester (Formula 17b). The mechanistic path of this remarkable... [Pg.327]

Irradiation of a-tropolone methyl ether (Formula 8a) first gives the valence tautomer 9a, then the rearranged bicyclic product 18a, and finally the ester 19a (12). The reactions occur in sequence, and each stage requires light (the final transformation of Formula 18 to Formula 19 can also be achieved by acid). The initial reaction has ample precedent (11). The final transformation simply involves addition of water to the enol ether followed by a reverse aldol reaction. [Pg.328]

Purpurogallin tetramethyl ether (Formula 25) gives Formula 26 on irradiation in ethanol (17). The formation of the methyl ester in ethanol... [Pg.329]

Formula 366) gives a bicyclic enol ether (Formula 367) which is hydrolyzed to Formula 368 (161,162). The sequence of Formulas 366-368 represents a potentially general synthesis of bicyclic cyclobutanone derivatives. A clever synthesis of m-3-cyclobutene-l,2-dicarboxylic acid anhydride (Formula 369) has been accomplished by irradiation of muconic anhydride (Formula 370) in ether (163). [Pg.389]

Irradiation of alkyl tropyl ethers in ether solution gives a surprising result. Methyl tropyl ether (Formula 396) gives 1-methoxybicyclo-[3.2.0]-hepta-3,6-diene (Formula 397) (175). The photoisomer pyrolyzes... [Pg.393]

A Transoid 1,3-Diene. In contrast to the considerable number of photochemical rearrangements of homoannular dienes only one photochemical rearrangement of a transoid heteroannular diene has been reported. Irradiation of 3,5-cholestadiene (Formula 400) in ethanol gives the pentacyclic ether (Formula 401) (176). [Pg.393]

Macrocycles (crown ethers, cryptands) with chromogenic groups combine the natural selectivity of macrocycles with the possibility of direct spectrophotometric determination of some metals (e.g., K, Ca) in an organic phase after extraction [127-129]. 4-Picrylamlnobenzo-15-crown-5 crown ether (formula 4.41) is applied in the extraction and spectrophotometric determination of potassium. The determinations are based on extractable ion-associates of metals (e.g., Li, Na, K, Pb) with crown ethers and xanthene or sulphophthalein dyes [130]. [Pg.69]

SOURCE The Dow Chemical Co. Dowanol Glycol Ethers Formulas... [Pg.88]

SOURCE Dow Chemical Co. DOWANOL Glycol Ethers Formula 36... [Pg.362]

Isopropyl ether Formula (CH3)2CH0CH(CH3)2 CAS 108-20-3 RTECS TZ5425000 IDLH 1400 ppm [10%LEL]... [Pg.182]

Isopropyl glycidyl ether Formula C6H12O2 CAS 4016-14-2 RTECS TZ3500000 IDLH 400 ppm... [Pg.183]

Allyl glycidyl ether Formula CeHio02 CAS 106-92-3 RTECS RR0875000 IDLH 50 ppm... [Pg.454]

Regulatory FDA 21CFR 175.300, 176.170, 176.180, 177.1200 Manuf./Distrib. CarboMer http //www.carbomer.com, Polyad Polyvinyl stearyl ether Synonyms Octadecane, l-(ethenyloxy)-homopolymer Polyvinyl octadecyl ether Definition Homopolymer of vinyl stearyl ether Formula [CH2CHO(CH2)i7CH3]x Uses Cosmetic ingred. [Pg.3612]

Tetrabromobisphenol A bis (2,3-dibromopropyl ether) Formula Weight 943.6 Bromine Content 67.7%... [Pg.49]

Tribromophenyl allyl ether Formula weight 371.0 Bromine Content 64.2%... [Pg.51]

Spectrometer Spektrometer Beckman DK 1 Solvent Losunqsmittel Ether Formula Formel CsHgO... [Pg.31]

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